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Electromagnetic lock

An electromagnetic lock, commonly known as a maglock, is a locking that utilizes an mounted on a and a corresponding armature plate attached to the , which securely bonds the two components together when electrical current is applied, thereby preventing unauthorized access without the need for mechanical keys or latches. These locks operate on the principle of , where a coil wound around a ferromagnetic core generates a powerful upon energization, attracting the armature plate with a holding typically ranging from 600 to over 2,000 pounds, depending on the model. The design is inherently , meaning the lock releases instantly when power is interrupted, ensuring free egress in emergencies such as fire alarms or power outages. Key components of an electromagnetic lock include the housing containing the assembly, the flat armature plate, and supporting electronics such as a and control board for integration with systems like keypads or readers. Installation is straightforward, often requiring only mounting the on the door frame header and the armature on the door itself, with no to wear out, which contributes to their durability and low maintenance needs. Electromagnetic locks are widely applied in , , and institutional settings, including buildings, hospitals, schools, and emergency exits, where they provide reliable traffic control and integrate seamlessly with -rated doors meeting standards like UL 10C for up to three hours of fire resistance. Advantages of electromagnetic locks include their tamper-proof nature, silent operation, and compatibility with electronic systems, allowing remote unlocking and quick response times without physical intervention. However, they require a constant power source, necessitating backup systems like batteries to maintain functionality during outages, and may need additional hardware such as motion sensors or request-to-exit buttons to comply with building codes like NFPA 101 and the International Building Code for safe egress. features often incorporated include magnetic bond sensors to monitor holding strength, delayed egress options providing 15 to 30 seconds of hold time, and relock delays to prevent premature re-locking. Overall, these locks offer a robust, keyless solution for modern security needs while prioritizing life through their mechanism.

Basic Principles

Operation

An electromagnetic lock consists of two primary components: an , which includes a wound around a core typically mounted on the , and an armature plate, a flat metal plate attached to the itself. When flows through the , it generates a that magnetizes the core, attracting the armature plate to secure the . This attraction can occur through direct-pull action, where the force pulls the plate perpendicular to the , or shear action, where the plate slides parallel to the while held by magnetic tabs. In the energized state, the continuous application of power maintains the , firmly holding the armature plate against the to keep the door closed against attempted openings. Upon de-energization, the power to the is interrupted, causing the to collapse instantaneously and release the armature plate without any mechanical components moving. This design ensures the door unlocks immediately when power is removed. Electromagnetic locks integrate with access control systems where sensors, keypads, or readers signal a controller to apply or remove power from the , thereby locking or unlocking the . For instance, a valid at a reader cuts power to release the lock, allowing entry. The typical cycle time for locking and unlocking remains under 1 second, providing rapid response for secure yet convenient access.

Theoretical Basis

Electromagnetic locks operate on the principles of , where electrical energy is converted into a through the flow of in a wrapped around a ferromagnetic core. According to , the circulation around a closed loop is proportional to the enclosed by that loop, enabling the generation of a strong, directed within the assembly. The strength of this field, denoted as magnetic flux density B, is directly proportional to the I passing through the and the number of turns N in the , as derived from the approximation B = \mu_0 \frac{N}{l} I, where \mu_0 is the permeability of free space and l is the length of the core. This magnetic field induces attraction between the energized electromagnet and an opposing armature plate, both typically made of high-permeability materials like soft iron or , securing the door or gate. The attractive force F arises from the magnetic across the contact interface and is approximated by the equation F \approx \frac{B^2 A}{2 \mu_0}, where A is the effective contact area between the electromagnet and armature. This highlights the quadratic dependence on B, emphasizing how small increases in can significantly enhance holding power. Several factors influence the magnitude of this attraction. The number of coil turns N amplifies the field for a given current, while higher current I directly boosts B; however, practical limits arise from heat generation and power supply constraints. The air gap d between the electromagnet and armature critically reduces force, as the reluctance increases linearly with distance, causing the field intensity to decrease approximately inversely with d and the force to fall off with the square of the distance. Material permeability \mu, which measures how effectively the core and armature channel magnetic flux, further optimizes attraction; higher \mu values in ferromagnetic materials minimize energy losses and maximize B. A notable challenge is residual magnetism, where a slight attractive persists after de-energization due to incomplete demagnetization in and armature. This can delay release in fail-safe applications. Modern designs mitigate this through improvements such as optimized coil materials and special supplies that minimize remnant flux, ensuring rapid and reliable disengagement. Unlike permanent locks, which rely on inherent, fixed in materials like for continuous attraction without , electromagnetic locks generate their fields inductively via applied current, allowing and elimination of the field upon .

Design and Specifications

Types and Variants

Electromagnetic locks, commonly known as maglocks, are categorized primarily by their physical , which determines the direction of magnetic attraction and suitability for different types. The two fundamental configurations are direct-pull and designs, each optimized for specific swing directions and aesthetic requirements. Direct-pull maglocks operate by creating a magnetic attraction perpendicular to the surface, pulling the armature plate directly toward the . This is standard for inward-swinging doors, where the lock is typically surface-mounted on the door frame header or strike , ensuring a straightforward when the closes. The perpendicular force provides reliable holding for single or double doors in interior applications. In contrast, shear maglocks apply a horizontal parallel to the contact surface between the and armature, using an or floating armature to interlock mechanically upon energization. This enhances aesthetics by allowing concealed or semi-concealed mounting within the door and frame, making it ideal for outward-swinging doors or installations where visible is undesirable. The armature aligns despite minor door gaps or misalignments, supporting applications on metal, wood, or glass doors with top rails. Electromagnetic locks are also classified by size to match various applications, from compact enclosures to large perimeter barriers. Micro locks, typically with holding forces around 150-300 pounds, are designed for small-scale uses such as cabinets, drawers, or housings, featuring dimensions under 4 inches for discreet integration. Mini locks, offering 80-650 pounds of force depending on the model, suit narrow frames or single interior doors, with compact footprints like 4.25 by 1.5 inches to fit tight spaces. Midi or standard locks, in the 350-800 pound range, serve full-size interior doors with dimensions around 10 by 3 inches, balancing strength and versatility for traffic. Heavy-duty variants, exceeding 1,200 pounds and often weatherproofed, are built for exterior gates or swinging/sliding barriers, incorporating robust housings like anodized aluminum for durability in harsh environments. Armature variations further differentiate designs: bonded armatures are fixed in position to maximize contact and holding force without manual adjustment, ideal for precise alignments in high-security setups. Non-bonded armatures, often pivoting or floating, provide flexibility to accommodate door imperfections or gaps up to 1/8 inch, ensuring consistent bonding in variable conditions like warped frames. Specialized variants address enhanced or installation needs. Delayed egress models incorporate a that holds the for 15-30 seconds after detection, triggering alarms and verbal warnings to deter unauthorized exits while complying with life safety codes; these integrate sensors for door status and override. Bracket-mounted options, using L- or Z-shaped adapters, enable overhead top-jamb or surface installations on out-swing doors, avoiding mortising while maintaining alignment. For instance, the RCI series includes multi-mag configurations for double doors, synchronizing dual electromagnets with shared power and monitoring for balanced operation across paired leaves.

Holding Force

The holding force of an electromagnetic lock refers to the , measured in pounds-force (lbf) or Newtons (), required to separate the armature plate from the under controlled testing conditions. This metric quantifies the lock's resistance to unauthorized separation, ensuring it maintains until intentionally released. Common holding force ratings vary by lock size and design, providing options for different security needs. For instance, micro-sized locks typically offer around 275 lbf (1,220 ), mini-sized models typically range from 80 to 650 lbf (350–2,900 ) depending on the manufacturer and application, midi variants provide about 800 lbf (3,600 ), and standard locks range from 1,200 to 1,500 lbf (5,300–6,700 ). These values represent representative industry benchmarks for surface-mounted configurations. Holding force is evaluated according to standards like ANSI/BHMA A156.23, which includes static pull and dynamic impact tests at full contact. Performance is tested with minimum requirements by security grade—such as Grade 1 locks enduring cycles while maintaining at least 500 lbf in incremental ratings up to 2,000 lbf or more. Force decreases significantly with gaps, such as up to 40% at a 1/8-inch (3.2 mm) separation to simulate potential separation attempts. Several factors influence the actual holding force achieved in practice. The contact surface area between the electromagnet and armature directly affects , with larger areas enabling higher forces. Gap tolerance plays a critical role, as even small increases—such as from 0 to 1 mm—can reduce force by up to 40% due to diminished magnetic attraction across the air space. Armature alignment must be precise; misalignment disrupts uniform contact, leading to uneven force distribution and overall reduction. Environmental conditions, including temperature, further impact performance: elevated temperatures increase coil resistance, linearly decreasing current and thus holding force by approximately 0.3% per degree above 20°C, resulting in about a 16% drop at 80°C. In real-world installations, the effective holding force often falls below rated specifications due to non-ideal conditions like misalignment or , which can cause dynamic stresses and reduce . For example, locks rated at 1,200 lbf have been observed to fail under practical breach attempts, necessitating upgrades to higher-rated models like 1,650 lbf for reliable performance, with potentially amounting to substantial losses in suboptimal setups.

Electrical Requirements

Electromagnetic locks typically operate on low-voltage (DC) power, with dual-voltage standards of 12 V or 24 V being the most common configurations to accommodate various systems. The 24 V option is often preferred in professional installations due to its lower current draw, which reduces wiring requirements and minimizes heat generation compared to 12 V . Current consumption for standard electromagnetic locks ranges from 0.25 A to 0.5 A at 12 V , equating to approximately 3–6 W of power during holding, while at 24 V it drops to 0.125–0.25 A (3–6 W); inrush currents may briefly reach up to twice these values upon activation. Heavy-duty models, such as those with holding forces exceeding 1,200 lbs, can draw up to 0.65 A at 12 V or 0.35 A at 24 V to support enhanced performance. Power supplies for electromagnetic locks must provide regulated output to ensure stable operation, typically using transformers that convert mains to the required voltage; these are often paired with backup batteries, such as 5–7 lead-acid units, to maintain functionality during brief power interruptions. The is 100% continuous, allowing indefinite energization without cycling, though the supply should be sized to handle multiple locks if deployed in multi-door setups. Wiring for electromagnetic locks employs low-voltage cabling, commonly 18–22 AWG wire, to minimize resistance and voltage drops over distances up to several hundred feet, with calculations ensuring no more than 5–10% loss to preserve holding force. protection, such as metal varistors (MOVs), is integrated or added to the power supply to safeguard against electrical spikes, while voltage monitoring circuits can detect drops below 10.3 V (for 12 V systems) or 20.5 V (for 24 V systems) to alert system operators. Heat generation arises from the continuous coil energization, with surface temperatures commonly reaching 50–70°C under full load in ambient conditions up to 40°C, necessitating adequate or spacing in enclosures to prevent thermal buildup and ensure longevity. Operating temperatures are rated from -10°C to +55°C for most units, beyond which performance may degrade.

Installation and Configuration

Installation Procedures

Site preparation for electromagnetic lock installation begins with verifying door alignment and frame compatibility to ensure optimal performance. Doors must swing freely without binding, and frames should be structurally sound, typically for direct mounting or requiring reinforcement to support the lock's holding . Compatibility checks include assessing frame depth and material; for instance, narrow frames may need L-brackets, while wooden or hollow metal doors require specific for secure fastening. Additionally, measure the between the door and frame, ideally maintaining no more than 1/8 inch clearance for the armature plate to achieve full holding , as greater gaps can compromise magnetic contact. Mounting options vary based on door type and swing direction to accommodate different configurations. For out-swinging doors, surface mounting using Z-brackets or L-brackets is common, positioning the lock on the header to avoid obstructing door closure. Mortise mounting conceals the lock within the for a streamlined appearance, suitable for inward-swinging doors, while overhead mounting applies to gates or heavy doors, ensuring rigid attachment to posts. Brackets like U-brackets suit frameless glass doors, and all mounts should use provided templates to mark and drill holes accurately, with screws tightened using thread-locking compound to prevent loosening. For gates, confirm post rigidity before proceeding, as inadequate support can lead to operational failure. Armature plate involves securing the plate to the opposite the , allowing for adjustable to maintain parallel contact. Drill holes per the —typically 1/2-inch for in metal doors and 5/8-inch for the armature side—then affix the plate using socket head screws and a rubber washer or silencers to enable pivoting and reduce noise or vibration from contact. Insert guide pins into the plate for stability, and ensure the assembly permits slight movement to compensate for door sag, with anti-tamper caps added for . Rubber components, such as washers between metal ones on the , help break the magnetic upon power loss and minimize wear. Essential tools for installation include a with bits sized to specifications (e.g., 3/16-inch Allen hex for screws), a level for alignment, shims to correct any door-frame irregularities, and an Allen wrench set for adjustments. Best practices emphasize using the template folded at 90 degrees to mark positions with the door closed, cleaning contact surfaces to remove debris that could reduce holding force, and verifying jumper settings for 12VDC or 24VDC before finalizing. Post-installation, test the pull force by applying to confirm secure engagement, and briefly reference power connections as detailed in electrical requirements to avoid integration issues. Common installation errors can significantly impair functionality, such as misalignment of the armature plate, which may cause significant loss in holding force due to uneven magnetic contact. Improper grounding or wiring can lead to intermittent failures from electrical noise, while over-tightening screws without allowing pivot freedom prevents proper seating. To mitigate these, always double-check alignment with a level and shims, and consult manufacturer templates to avoid drilling inaccuracies that obstruct door operation.

Fail-Safe vs. Fail-Secure

Electromagnetic locks, commonly known as maglocks, operate primarily in fail-safe mode, where the loss of power causes the lock to release and unlock the door, allowing immediate free egress. This design ensures that in the event of a power failure or emergency, occupants can exit without obstruction, making it the default configuration for most maglock installations. Fail-safe mode is particularly required for interior doors in means of egress paths, as it aligns with life safety priorities by preventing the lock from impeding escape during critical situations. In contrast, fail-secure mode for electromagnetic locks maintains the locked state upon power loss, which is rare for pure maglocks due to their inherent reliance on continuous electrical current to generate the magnetic holding force. To achieve fail-secure functionality, these systems typically incorporate a mechanical backup, such as a or that engages independently of the , ensuring the door remains secured without power. This mode is better suited for perimeter applications where maintaining is paramount, though it necessitates alternative egress mechanisms to comply with safety codes. Configuration of these modes is managed through relays or dedicated controllers that monitor power status and integrate with building systems; for instance, fail-safe maglocks are wired to automatically release upon activation of fire alarms or emergency signals, ensuring with egress requirements. The power supply plays a key role in sustaining operation, with fail-safe setups often including uninterruptible backups to delay release only briefly if needed. Trade-offs between the modes center on balancing and : fail-safe prioritizes life safety by enabling rapid egress, such as in delayed egress scenarios with a delay of up to 15 seconds, or 30 seconds where approved by the authority having jurisdiction, before full release, while fail-secure enhances protection against unauthorized entry but restricts its use to non-egress critical areas due to potential egress delays. A representative example of code-driven application is found in the International Building Code (IBC), which mandates operation for electromagnetic locks on egress paths, requiring integration with request-to-exit (REX) buttons that initiate immediate or delayed release to facilitate safe evacuation.

Performance Evaluation

Advantages

Electromagnetic locks possess no , which significantly reduces mechanical wear, lowers maintenance needs, and eliminates failure points common in or motorized locks that rely on physical components subject to and over time. This design enhances long-term reliability, as the locking mechanism depends solely on electromagnetic attraction between the coil and armature plate, avoiding the mechanical stress that can lead to breakdowns in alternative systems. Their high versatility allows installation on diverse door materials, such as metal, , and —often with simple adapters or brackets for non-ferrous surfaces—making them adaptable to various architectural configurations without requiring extensive modifications. This flexibility contrasts with more rigid mechanical locks, enabling seamless application across inward-swinging, outward-swinging, sliding, and even overhead in both residential and commercial settings. Electromagnetic locks operate silently, producing no clunking or clicking noises during engagement or release, which is particularly beneficial in noise-sensitive environments like offices and hotels where discretion is valued. Integration with remote control systems is straightforward, as these locks interface easily with panels, , fire alarms, and mobile applications, facilitating scalable and remote unlocking capabilities without additional complexity. They offer quick response times, achieving lock and unlock actions in under one second upon power application or removal, surpassing the slower actuation of motorized locks that involve gear or movements.

Disadvantages

Electromagnetic locks rely on continuous electrical power to maintain their holding force, making them vulnerable to failure during power outages, where they default to an unlocked state unless integrated with backup systems such as uninterruptible power supplies (). This dependency introduces additional costs and complexity for implementing reliable backups, particularly in facilities requiring constant . The continuous current required to energize the generates , which can reach operating temperatures up to 185°F (85°C) and limit installations in enclosed spaces without adequate to prevent overheating or component degradation. While modern designs incorporate efficient coils to minimize excessive warming, the inherent production remains a for certain environments. Initial costs for electromagnetic locks typically range from $100 to $500 per unit, significantly higher than basic mechanical locks costing around $50, with additional expenses for wiring and power infrastructure further increasing the overall investment. This premium pricing can deter adoption in budget-constrained applications despite long-term durability benefits. Residual magnetism in the and armature can cause minor sticking after de-energization, potentially delaying door release, though this is mitigated in contemporary models through design features like offset mounting plates or integrated circuits. Early iterations suffered more from this issue, but advancements have reduced its prevalence without eliminating the need for careful alignment during installation. Due to their power-based operation, electromagnetic locks are susceptible to tampering by simply interrupting the power supply, which can be achieved through accessible wiring or , necessitating supplementary monitored systems for enhanced protection. Such vulnerabilities highlight the importance of integrating these locks within comprehensive security frameworks rather than relying on them in isolation.

Applications and Safety

Applications

Electromagnetic locks are widely employed in systems for commercial buildings and offices, where they secure keyed or card entry points by integrating with push bars, request-to-exit devices, or credential readers to provide locking for interior and perimeter . In these settings, they enable controlled access to restricted areas while allowing quick release during emergencies, making them suitable for high-traffic environments such as hotels and properties. For perimeter security, electromagnetic locks are used on and fences in warehouses and facilities, particularly in high-traffic areas, where weather-resistant models with holding forces up to 1,200 pounds secure swinging or sliding against unauthorized entry. These locks feature rugged housings and IP67 ratings for outdoor durability, ensuring reliable performance in industrial and storage applications. In fire-rated door applications, electromagnetic locks secure doors in the closed position during normal operations and integrate with fire alarms to release instantly upon detection, complying with UL10C standards for positive fire tests up to three hours. This mechanism supports safe evacuation in commercial and public buildings by combining with systems that include magnetic bond sensors and door position switches. Specialized uses include securing wards in hospitals, where electromagnetic locks facilitate reliable in emergency rooms and sensitive areas; classrooms in schools for rapid during threats; and server rooms in data centers to protect with high holding forces. In these high-security environments, such as government offices and healthcare facilities, the locks ensure only authorized personnel gain entry while maintaining emergency release capabilities. Emerging applications involve integration with () systems for residential smart homes, where electromagnetic locks enable remote control, keyless entry, and automation for cabinets or doors in setups. These -enabled variants enhance convenience by communicating with other devices for and access , extending traditional commercial uses to domestic settings.

Safety Considerations and Standards

Electromagnetic locks must comply with stringent egress requirements to ensure occupant safety during emergencies. The International Building Code (IBC) and NFPA 101 Life Safety Code require electromagnetic locks to release immediately upon activation through panic hardware (including integrated switches as required by the 2024 IBC), approved sensors where permitted, or request-to-exit devices, preventing obstruction in means of egress paths. Beginning with the 2024 IBC, sensor-release mechanisms are prohibited on doors required to have panic hardware, requiring release via a switch in the panic hardware itself. Delayed-egress systems using electromagnetic locks may allow up to 15 seconds under specific conditions in permitted occupancies. Installation of electromagnetic locks on primary exits is prohibited without specific authority approval, such as integration with approved fire alarm systems, to maintain free and immediate egress. Fire safety integration is critical, requiring electromagnetic locks to automatically unlock upon detection of , , or of fire alarms and sprinkler systems. These systems must undergo testing under UL 294 standards for unit performance, ensuring reliable operation in and scenarios. Key standards govern the design and performance of electromagnetic locks to address life safety and . ANSI/BHMA A156.23 specifies requirements for holding force, electrical operation, cyclical endurance, dynamic strength, and operational tests, classifying locks into grades based on performance levels; the latest edition () includes updated tests for endurance and strength. Internationally, under the Directive and Directive ensures compliance with European safety and requirements for electromechanical locks. In and , the Regulatory Compliance Mark (RCM) verifies adherence to electrical safety and standards for electromagnetic locks. The Building By-law (VBBL) regulates their use in egress paths, limiting total release delays to no more than 15 seconds across all locks in the path. Potential risks associated with electromagnetic locks include power failures that could trap occupants if not configured for operation, or delayed releases that hinder timely evacuation in fires. Mitigations involve incorporating redundant power supplies, such as battery backups, to maintain functionality and automatic release mechanisms, alongside annual inspections to verify compliance and operational integrity. A notable example is the 2020 update to the Building By-law, which expanded permissible use of electromagnetic locks to non-egress areas and certain means of egress paths under specified conditions, including integration with systems and maximum 15-second delays.

Historical Development

Invention and Early Adoption

The concept of electromagnetic locks dates back to the early , with initial designs emerging that utilized to secure doors remotely, such as in banking applications to prevent unauthorized access during emergencies. One such early patent, filed in 1934 by inventors Glen F. Cavanaugh, Alex Calmeyn, and Peter Bruijnooghe, described a system where an in the door frame drew a spring-loaded into a keeper upon activation by a switch, providing a simple and cost-effective locking mechanism for multiple doors. However, these early implementations were limited in scope and did not achieve widespread practical use due to technological constraints and regulatory hurdles. The first modern direct-pull electromagnetic lock, which became the basis for contemporary designs, was invented in 1969 by Sumner "Irving" Saphirstein, founder of Locknetics. This innovation addressed growing post-World War II demands for enhanced building security and compliance with evolving regulations, which sought reliable electric alternatives to mechanical locks that could ensure free egress during emergencies. Prior to the , building codes generally prohibited locking perimeter exit doors from the interior, restricting options to panic hardware for unobstructed escape; Saphirstein's design incorporated features, releasing the lock upon power failure or fire alarm activation, thus meeting these code requirements. A key milestone in early adoption occurred in with the initial installation of Saphirstein's electromagnetic locks at the arena in , , where they were used to hold doors in a secure yet fire-safe manner during events. Local authorities had raised concerns about in the high-occupancy venue, and the maglocks provided a solution by allowing doors to remain latched without impeding , marking one of the first approved uses in a public assembly space. During the , electromagnetic locks gained traction in commercial buildings as regulations began permitting their use on egress doors when integrated with approved release mechanisms, driven by companies like Locknetics that commercialized Saphirstein's technology. This period saw initial patents and refinements focused on basic mechanisms, enabling broader implementation in offices and spaces where and reliability were prioritized over traditional keyed systems.

Evolution and Modern Advancements

In the and , the electromagnetic lock industry saw significant standardization and innovation to address reliability and compliance needs. The Builders Hardware Manufacturers Association (BHMA) published ANSI/BHMA A156.23 in 1983, establishing the first American National Standard for electromagnetic locks, which outlined requirements for cyclical, dynamic, operational, strength, and finish testing to ensure consistent performance across manufacturers. This standard facilitated broader adoption by providing benchmarks for holding force and safety. Concurrently, shear locks emerged as an advancement over traditional direct-pull designs, with Von Duprin introducing commercial models in the mid- to reduce door sag and improve alignment on high-use doors. By 1989, Security Door Controls patented an improved shear electromagnetic lock, enhancing distribution for greater durability. Delayed egress models also gained traction, pioneered by SDC Security in 1985, which allowed a 15- to 30-second delay before unlocking to deter unauthorized exits while complying with fire codes. The 2000s marked deeper integration with regulatory frameworks and efficiency improvements. The International Building Code (IBC) 2000 edition introduced provisions for access-controlled egress doors, including electromagnetic locks, under Section 1008.1.3.3, permitting their use in specified occupancies with automatic release upon fire alarm activation and power failure to ensure safe egress. This alignment with building codes expanded applications in commercial and institutional settings. Additionally, low-power designs became prevalent, consuming as little as 3 watts, paired with LED monitoring for real-time status indication of lock engagement and door position, reducing energy use and enabling remote diagnostics. From the to the , electromagnetic locks evolved toward smart and connected systems. ASSA ABLOY's Aperio platform, launched around , introduced control and compatibility for systems that can integrate with electromagnetic locks via hubs, allowing seamless credential management and CE-compliant operation in . Energy-efficient models further advanced, minimizing continuous power draw to reduce operational costs. As of 2025, trends emphasize integration and enhanced security. -monitored maglocks now enable by analyzing , , and usage data to forecast failures, potentially reducing downtime by up to 30% in networked environments. High-security variants achieve holding forces up to 4,000 lbf, as seen in Securitron's MM15 series, for perimeter and applications requiring extreme resistance. The industry has shifted from standalone units to networked ecosystems, where maglocks interface with centralized platforms like those from , supporting real-time monitoring and scalability across facilities.

References

  1. [1]
    What Is Electromagnetic Lock and How It Works? - HVR MAG
    An electromagnetic lock creates a magnetic field when energized or powered up, causing an electromagnet and armature plate to become attracted to each other.Missing: definition | Show results with:definition
  2. [2]
    Electromagnetic Locks | Schlage 101
    Electromagnetic locks, also known as mag locks, are locking devices that consist of an electromagnet in a housing that is mounted on the door frame.Missing: principles | Show results with:principles
  3. [3]
    [PDF] Basics of electromagnetic locks - Allegion US
    Electromagnetic locks use an armature and coil assembly that magnetize when current passes through, using electromagnetism to lock the door. They are fail-safe.Missing: principles | Show results with:principles
  4. [4]
    Everything You Need to Know About Electromagnetic Locks
    Electromagnetic locks, often referred to as maglocks, are a type of locking device that consists of an electromagnet and an armature plate.Missing: definition | Show results with:definition
  5. [5]
    [PDF] Electromagnetic Locks - Security Door Controls
    Unlike an electromechanical lock, the electromagnetic lock had no moving parts to bind or wear, making it ideal for fire life safety applications that require ...
  6. [6]
    What is the response time of a magnetic door lock set when ...
    Aug 15, 2025 · High-quality materials are more likely to provide a reliable and fast response time, while cheaper materials may lead to slower unlocking times.
  7. [7]
    https://www.hpeslock.com/blog/what-is-the-response-time-of-a-magnetic-door-lock-set-when-unlocking-811306.html
  8. [8]
    [PDF] Magnetic Force Equations based on Computer Simulation and the ...
    The Maxwell magnetic force equation F = B2A/(2μ0) [1-6] can be used for determining the magnetic force of magnetic components, where F is the force in newton (N) ...
  9. [9]
    US10450776B2 - Low power magnetic lock assembly
    Equation (6) is derived supposing that the magnetic and external forces remain constant after activation. Since the magnetic force depend on the distance ...
  10. [10]
    Explanations on Magnetic Pull Force & Calculating Equation
    This blog is an attempt to explain what magnetic pull force is, its synonyms and how to calculate it with equation.
  11. [11]
    2 Types of Magnetic Locks - Beacon Metals
    Dec 3, 2018 · Electromagnetic locks are locks that have two main pieces: the armature that is mounted to the door and the magnetic lock assembly that is ...Missing: variants classifications bonded specialized delayed bracket-
  12. [12]
    1561TJ Series - Surface Top Jamb Electromagnetic Shear Locks
    SDC's HiShear® electromagnetic shear locks are designed, engineered and built in America for openings that require an architecturally superior appearance.Missing: types variants direct- size bonded non-
  13. [13]
    SAM Shear Aligning Magnalock® | Securitron
    Hidden strength for any application. 1200 lbs. holding force Shear Aligning Magnalock mounts fully concealed into wood, steel or aluminum doors.Missing: armature | Show results with:armature
  14. [14]
    E300 - Electromagnetic Cabinet Locks - Security Door Controls
    SDC's E300 micro electromagnetic cabinet locks provide a connected access control solution that is virtually maintenance free and has a lock status output.Missing: mini midi standard heavy- duty
  15. [15]
    S2500A Mini Mag Lock - Specialty Locks (RCI) - Dormakaba
    The S2500A is a mini magnetic lock for single doors, fail-safe, with 165lbf holding force, 240mA 12VDC, and a 3 year warranty. It has a brushed anodized ...
  16. [16]
    EM-NH350 Midi Electromagnetic Lock - GIANNI INDUSTRIES, INC.
    EM-NH350 is designed for surface mount on outswing doors. Its slide-in mounting plate simplifies the process of installation and firmly secures the magnet. EM- ...
  17. [17]
    M490G Magnetic Gate Locks - Schlage Commercial
    The Schlage M490G is a heavy duty electromagnetic lock with 1500 lb. rated hold force. It's designed as a gate lock & is ANSI/BHMA outdoor certified .
  18. [18]
    DE8310 Delayed Egress - Mag Locks (RCI) - Dormakaba
    Oct 1, 2025 · The DE8310 Delayed Egress all-in-one lock can detect when pressure is applied to a door and can be field selected with a release delay of 15 or 30 seconds.Missing: variants direct- pull shear size classifications bonded
  19. [19]
    DEM680E EcoMag® Delayed Egress Magnalock® | Securitron
    The DEM680E is a delayed egress lock for interior/perimeter doors, with autosensing, magnetic sensor, instant release, and configurable delay times.
  20. [20]
    1200DE Delayed Egress Magnetic Lock - Alarm Controls
    Bracket mounted, single magnetic lock with 1200 lbs of holding force that can be easily installed without special tools.Missing: variants direct- pull shear size classifications bonded armatures
  21. [21]
    [PDF] Electromagnetic Lock Installation Instruction (Indoor Series)
    Mini EM-locks (600 LBS) maximum thickness of door is 50 mm. Midi EM-locks (800 LBS) maximum thickness of door is 48 mm. Standard EM-locks (1200 LBS) maximum ...Missing: typical values
  22. [22]
    A156.23 - 2022 Electromagnetic Locks
    A156.23-2017 establishes requirements for electromagnetic locks and includes cyclical, dynamic, operational, strength and finish tests.
  23. [23]
    The capacity of Controlock® magnet and the influencing factors
    Dec 3, 2024 · The factors influencing the force are the air gap, the thickness of the steel plate, the type of steel, and temperature.
  24. [24]
    [PDF] Relationship between Temperature and the Holding Force of an ...
    But, if the temperature of the coil is increased, the resistance of the wire will increase due to its positive temperature coefficient. Given the inversely ...
  25. [25]
    About Electric lock
    Generally, the specification of the electromagnet locks is dual voltages12/24 V DC. Single voltage output can be required for 12 V DC or 24 V DCapplications.<|control11|><|separator|>
  26. [26]
    Do You Power Locks With 12vdc Or 24vdc? - IPVM Discussions
    A lock that is 12VDC and runs at .5 amps compared to a lock at 24VDC that runs at .25 amps. So it is cheaper to run a power supply and hardware at 24VDC.
  27. [27]
    What are the MA lock electrical requirements? - Allegion
    MA lock can use 12V DC or 24V DC (default 12V). 12V: .42A in-rush, .135A holding; 24V: .21A in-rush, .135A holding. AC with rectifier is also an option.Missing: supply | Show results with:supply
  28. [28]
    M490/492 Electromagnetic Locks - Schlage Commercial
    Heavy Duty. Status Indicator. Electronic Access Control · Fire Rated. Monitoring ... Current draw .65A @ 12 VDC, .35A @ 24 VDC; Dimensions: 3" H x 12-1/2" L ...
  29. [29]
    https://kc.allegion.com/kb/article/what-are-the-ma-lock-electrical-requirements/
  30. [30]
    Calculating Power Supply Needs - PASEK Corporation
    Jun 3, 2022 · For example, if a magnetic lock requires 24DC, the power supply must give 24 volts direct current. The current required ... Magnetic lock .
  31. [31]
    [PDF] access control system - wire gauge size & distance chart
    Minimum Wire Gauge for 12 volts AC or DC. Maximum Distance Allowable For a 5% Voltage Drop From the Power Supply to the Furthest Load On One Circuit. AMPS.Missing: surge | Show results with:surge
  32. [32]
    https://pasek.com/resources/calculating-power-supply-needs/
  33. [33]
    [PDF] Electromagnetic Locks for Safety & Security
    Operating temperature for the mag- netic lock will not exceed 185° F (85° C). Maximum ambient temperature is not to exceed 104° F (40° C). For supply connec- ...
  34. [34]
    Sprint Locks & Security Solutions - High Quality Industrial Magnetic ...
    Operating Temperature: 0 - 55°C. Operating Humidity: 0 - 95% (non ... SPRINT Holdfast™ generation of electromagnetic locks with common features ...
  35. [35]
    [PDF] INST-E600.pdf - INSTALLATION INSTRUCTIONS
    Mount the lock on the stop side of the door, use a fused power supply, secure the armature, install the mounting plate, and connect power. Test operation.Missing: procedures | Show results with:procedures
  36. [36]
    None
    ### Summary of Installation Steps for 8310/8320 Electromagnetic Locks
  37. [37]
    [PDF] Electromagnetic Locks - SECO-LARM.com
    Electromagnetic Locks. Installation Manual. E-941SA-1K2DPSQ shown. Model*. Holding Force†. Material. E-941Sx-600DPSQ‡. 600-lb (272kg). Anodized aluminum. E- ...
  38. [38]
    https://www.maglocks.com/mm5/graphics/00000002/8310-20-install.pdf
  39. [39]
    How to Install and Unlock a Magnetic Door Lock - Kisi
    Installation involves drilling holes, mounting brackets, running wires, and powering up. Unlocking is done by cutting power, often via an access control system.
  40. [40]
    Troubleshooting Magnetic Door Locks | Kisi
    Dec 1, 2022 · Common issues include physical weariness, electrical problems, and failure to release/lock. Ensure proper door alignment, use wider cables, and ...
  41. [41]
    How to Fix a Magnetic Door Lock? - Dicsan Technology
    Misalignment can reduce the magnetic holding force or prevent the lock from functioning altogether. Inspect the door hinges and frame for any sagging, warping, ...Failure To Lock Or Unlock · Weak Holding Force · Electrical Issues<|separator|>
  42. [42]
    Decoded: Fail Safe vs. Fail Secure - iDigHardware
    Oct 2, 2023 · Beginning with the 2024 edition of the International Building Code (IBC), the code will prescriptively require fail safe electrified locks ...
  43. [43]
    None
    ### Summary: Fail-Safe vs. Fail-Secure for Electromagnetic Locks
  44. [44]
    Fail Secure vs. Fail Safe: Decoding Door Security Systems
    This is not typical and is not a requirement of the International Building Code or NFPA 101–The Life Safety Code. ... Electromagnetic locks are only available ...
  45. [45]
    Electromagnetic Door Locks: Magnetic vs Electric Strikes - Avigilon
    If you install these locks, make sure you have backup power and added surveillance in place to keep your electromagnetic door lock systems secure. Dependent on ...
  46. [46]
    Magnetic Locks: A Versatile Solution for Modern Access Control
    Magnetic locks are often the go-to choice for securing openings that don't fall neatly into standard hardware setups. They offer a clean, reliable solution.
  47. [47]
    https://codes.iccsafe.org/content/IBC2021P2/chapter-10-means-of-egress
  48. [48]
    7 Reasons Why Mag Locks are better for your Business Security
    Why Mag Locks are the best choice to secure your business. High security, easy installation, and low maintenance make it a top for businesses.
  49. [49]
    Electric Strike vs Maglock - Dicsan Technology
    ADVANTAGES. Maglock system possess many advantages especially over traditional strikes and electromagnetic locks: ... Silent Operation. Ideal for offices or ...
  50. [50]
    What Is a Magnetic Lock? A Complete Guide for Beginners - TopLock
    Jan 22, 2025 · A magnetic lock, or maglock, uses electromagnetic force to secure doors, generating a magnetic field between an electromagnet and a metal plate.
  51. [51]
    What Is Electromagnetic Lock and How It Works?
    Sep 3, 2021 · An electromagnetic lock creates a magnetic field when energized or powered up, causing an electromagnet and armature plate to become attracted ...
  52. [52]
    Electric Locks vs Magnetic Locks: What's the Difference? - ButterflyMX
    Feb 20, 2025 · Electric locks are fail-secure, needing power to unlock, while magnetic locks are fail-safe, needing power to stay locked. Electric locks ...
  53. [53]
    Pros and Cons of installing Mag Lock to Protect your Business
    Cons of Installing Mag Lock Doors · Cost factor · Complexity of Installation · Power Outages and Failures · Need for Regular Maintenance.
  54. [54]
    [PDF] Electromagnetic locks are a popular method to control the locking ...
    Electromagnetic locks are a popular method to control the locking and unlocking of access ... These locks include an adjustable 0 – 90 sec relock time.
  55. [55]
    Are magnetic door lock magnets normally warm all the time?
    Aug 5, 2024 · Yes, it's normal for door-holding by electromagnets to feel slightly warm. All electromagnets, other than superconducting magnets, dissipate energy.
  56. [56]
    https://www.spottersecurity.com/blog/installing-mag-lock/
  57. [57]
    https://buildershardware.com/Portals/0/Files/News%2520Coverage/Locksmith%2520Ledger_April%25202018.pdf?ver=2019-04-04-125951-227
  58. [58]
    How Do Magnetic Locks Work? - Great Valley Lockshop
    Sometimes, residual magnetism can cause the lock to remain engaged even when power is off. This happens when the electromagnet retains a small charge, ...
  59. [59]
    Do you know the disadvantages of using maglocks? - SecurCom
    Oct 13, 2015 · Another disadvantage of applying a maglock to your business' door is the door becomes more difficult to open the longer the maglock is ...
  60. [60]
    Electromagnetic Lock Applications | Commercial & Residential ...
    Electromagnetic locks are used to secure the door in conjunction with push bars, request-to-exit devices or credential readers for fail-safe applications.
  61. [61]
    Electromagnetic Locks - Security Door Controls
    SDC's Electromagnetic Locks are suited for interior doors, perimeter exit doors and entrances that require failsafe emergency release capability. 1510 Series.
  62. [62]
    Uses and advantages of electro magnetic locks and access control
    Mar 3, 2023 · 1.Commercial buildings: Magnetic locks and access control systems are often used to regulate access to restricted areas in commercial facilities ...
  63. [63]
    8380 GateMag - Electromagnetic Locks (RCI) - Dormakaba
    Oct 1, 2025 · The 8380 GateMag is weather resistant with a rugged, stainless steel housing. Making it an excellent solution for interior and exterior perimeter gates.Missing: security | Show results with:security
  64. [64]
    M450/452 Electromagnetic Locks | Schlage Maglocks
    The Schlage M450 is an electromagnetic lock with 1000lb hold force. The Maglock is usually combined with request-to-exit devices and credential readers.Overview · Mag Locks · Need Replacement Parts?Missing: alarms | Show results with:alarms
  65. [65]
    Magnetic Door Locks and Access Control | CDF Doors
    Jan 23, 2024 · This fail-safe design is particularly important for emergency situations, requiring integration with fire alarm, automatic fire detection, or ...Fail-Safe Operation · Safely Managing Magnetic... · Considerations For...
  66. [66]
    Electromagnetic Door Locks - GeoArm Security
    ### Summary of Electromagnetic Door Locks in High-Security Buildings
  67. [67]
    Door Control Solutions for Healthcare Facilities - Dortronics
    Aug 21, 2024 · For example, electromagnetic locks, also known as maglocks, are ideal for emergency rooms as they facilitate reliable access control functions.
  68. [68]
    Everything You Need To Know About A Maglock - Keri Systems
    Maglocks, also known as electric locks or electromagnetic ... Maglocks are commonly used in commercial buildings government facilities, schools, hospitals ...
  69. [69]
    When is it necessary to use a Maglock? - Spotter Security
    Maglocks can be used to restrict access to certain areas such as labs, data centers, or administrative offices, ensuring that only authorized personnel have ...<|separator|>
  70. [70]
    IoT-Based Smart Remote Door Lock and Monitoring System Using ...
    Nov 19, 2024 · To lock or unlock the door, electromagnetic radiation is used. For projects like home automation and smart and automatic doors, cabinets, ...
  71. [71]
    What can the IoT Magnetic Lock Bring to Our Life? | MAKE
    Dec 4, 2020 · These locks are widely used in vending machines, lockers, etc., providing users with safer, smarter and more convenient life services. An IoT- ...
  72. [72]
    Decoded: Code Requirements for Electromagnetic Locks
    Jul 6, 2017 · The code requirements for access-controlled egress doors (now called “sensor-release”) apply to locks that are unlocked by a sensor that detects an approaching ...
  73. [73]
    Permissible Egress Door Locking Arrangements - NFPA
    Jul 9, 2021 · The provisions of NFPA 101, Life Safety Code, are aimed at preventing locked door assemblies in means of egress in the event of fire. The Code ...
  74. [74]
    CHAPTER 10 MEANS OF EGRESS - ICC Digital Codes
    Chapter 10 provides the general criteria for designing the means of egress established as the primary method for protection of people in buildings.
  75. [75]
    Locking Configurations for Access and Egress Control - UL Solutions
    The 2024 International Building Code (IBC) and the 2024 NFPA 101 Life Safety Code include requirements for a means of egress system to be provided ...
  76. [76]
    Quick Code Q&A: Electromagnetic Locks Released by a Sensor
    Dec 14, 2023 · Electromagnetic locks released by a sensor must also unlock upon activation of a fire alarm or automatic sprinkler system (if present)—the door ...Missing: integration | Show results with:integration
  77. [77]
    Proper Application of UL Standards for Controlled or Delayed ...
    Mar 5, 2021 · UL 294 covers access control units, and UL 1034 covers burglary-resistant electric locks. UL 294 can control UL 1034 certified locks.
  78. [78]
    EN 14846: Building hardware - Locks and latches - Intertek
    Certification: CE Marking: Electromechanically operated locks and striking plates should meet the requirements as described in the standard EN 14846, which ...
  79. [79]
    [PDF] Z4/Z8 Double Series Electromagnetic Locks - TRIMEC
    Hereby, ASSA ABLOY Australia Pty Ltd declares that the Z8 & Z4 Double Series EML is in compliance with the. Regulatory Compliance Mark (RCM) for Australia and ...
  80. [80]
    [PDF] Division B - Section 3.4. Exits (Rev11) - BC Publications
    h) the total time delay for all electromagnetic locks in any path of egress to release is not more than 15 s (See note A-3.4.6.16.(4)(h).), i) where a ...
  81. [81]
    FAQs About Electromagnetic Locks – I Dig Hardware
    Jul 7, 2022 · Electromagnetic locks are fail safe – when power is cut, there is no magnetic bond, and the lock is unlocked. For example, if a mag-lock is ...
  82. [82]
    Unveiling Vulnerabilities in Magnetic Locks: Insights from a Security ...
    Oct 28, 2023 · During a power outage or electrical failure, these locks can automatically disengage, leaving the premises vulnerable to unauthorized entry.Missing: tampering | Show results with:tampering
  83. [83]
    [PDF] Use of electromagnetic locks within means of egress
    Apr 27, 2020 · New requirements allowed wider use of electromagnetic locks including their installation within means of egress in addition to only exit doors ...
  84. [84]
    US1958940A - Electromagnetic lock - Google Patents
    The present invention relates to an electromagnetic lock and is designed for use in banks or the like and the main object of the invention is to provide ...
  85. [85]
    What is a Maglock and When do you need one? - Spotter Security
    Fun fact – The Modern Maglock was invented in Canada. The first maglock was designed by Sumner “Irving” Saphirstein in 1969 for doors at the Montreal Forum.
  86. [86]
    Lock the Door Standards Set
    Oct 25, 2023 · 23. Electromagnetic Locks. 1983 ; 24. Delayed Egress Locking System. 1983 ; 25. Electrified Locking Devices. 1983 ; 28. Master Keying. 2000.
  87. [87]
    Multi-directional self-aligning shear type electromagnetic lock
    in the mid 1980's. Von Duprin has released commercial shear locks since that time without the tilting feature. An example of a Von Duprin design without the ...
  88. [88]
    Understanding Delayed Egress Devices
    Aug 2, 2024 · SDC pioneered the revolutionary delayed egress locking category in 1985. We patented the ExitCheck® 1511S series in 1995 – the first delayed ...Missing: introduction 1980s 1990s
  89. [89]
    [PDF] ICC IBC (2000): International Building Code
    This comprehensive building code establishes minimum regulations for building systems using prescriptive and perfor- mance-related provisions. It is founded on ...
  90. [90]
    Electromagnetic Lock Basics | Locksmith Ledger
    Mar 31, 2007 · Electromagnetic locks have evolved in the way they operate and are installed. An early improvement eliminated magnetic residue. A later ...Missing: mitigation | Show results with:mitigation<|separator|>
  91. [91]
    Wireless locking - Assa Abloy
    Electromagnetic locks · Electromagnetic locks · Accessories · Electric strikes · 900 series · 131 series - high security · 14 series - medium security · 75 ...Missing: 2010s | Show results with:2010s
  92. [92]
    Electromagnetic Locks | Securitron
    When you choose a genuine Securitron® Magnalock®, you get quality solutions for high traffic and high security applications plus MagnaCare® lifetime ...MCL Magnetic Cabinet Lock · M62 Magnalock · M32 Magnalock · DM62 MagnalockMissing: principle | Show results with:principle
  93. [93]
    Magnetic Door Lock Strategic Insights: Analysis 2025 and Forecasts ...
    Integration with AI and Machine Learning: Future iterations may leverage AI for predictive maintenance, anomaly detection, and enhanced access control analytics ...
  94. [94]
    Electronic Access & Data - Dormakaba
    Dormakaba offers networked access control, electric strikes, electromagnetic locks, readers, keypads, credentials, time clocks, and data collection solutions.Electric Strikes · Electromagnetic Locks · Electronic door locks · Specialty Locks