Technical Foundation
What Is a Electromagnetic Lock Activation Device?
Electromagnetic locks (maglocks) hold a door shut by continuous current to an electromagnet and release the instant that current is cut — they have no mechanical latch to defeat. Activation devices are the components that either request the lock release (request-to-exit sensors, push buttons, key switches) or interface with the building's access control panel to cut power on a valid credential. Because a maglock is fail-safe by design (loses holding force on power loss), the activation device's job on the egress side is simply to interrupt current, not to unlatch a mechanism.
Life-safety code (NFPA 80/101 and local fire/building codes) generally requires a free-egress path — a request-to-exit sensor or a mechanical push button must release the lock without requiring a key or card from the inside, and the lock must also release on fire alarm activation and loss of power. Delayed egress devices are the exception, permitted only under specific code conditions with a time delay and local alarm, and require careful compliance verification before specification.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Device Type | REX sensor, push button, key switch, break-glass | Determines how the release request is initiated — motion, manual press, or key |
| Voltage | 12VDC or 24VDC, matching the lock power supply | Mismatched voltage prevents proper lock release or sensor operation |
| Output Contact | SPDT relay, Form C dry contact | Must match the input the access control panel or lock circuit expects |
| Mounting | Wall-mount, door-mount, mullion-mount, flush or surface | Determines compatible door/frame types and installation location |
| Code Compliance | Free-egress vs. delayed egress per NFPA 101/local code | Non-compliant configuration can create a life-safety and code violation |
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Applications
Where Electromagnetic Lock Activation Devices Get Used
Electromagnetic lock activation devices are specified anywhere a maglock-secured door needs a code-compliant, reliable way to request or trigger release.
Commercial Office Access Control
Request-to-exit sensors and card reader interfaces controlling maglock-secured entry doors in multi-tenant buildings.
Data Center & Server Room Security
Key switches and push-button releases layered with card access for high-security equipment rooms.
Healthcare Facilities
Delayed egress devices on specific wards where code permits a controlled delay, paired with fire alarm interconnect.
Retail Loss Prevention
Push-button and break-glass emergency releases on secured stockroom and cash-office doors.
Educational Facilities
REX sensors on classroom and building entry doors integrated with campus-wide access control panels.
Industrial & Warehouse Security
Key switches and weatherproof push buttons on exterior maglock doors and gates.
FAQ
Electromagnetic Lock Activation Devices Questions, Answered
Why does an electromagnetic lock need a request-to-exit sensor at all?
A maglock has no mechanical latch — it holds purely through continuous current. Life-safety code generally requires the egress side of the door to release without a key or credential, so a REX sensor (usually PIR motion-based) or a mechanical push button is required to interrupt lock power and allow free exit, independent of the access control system on the entry side.
What voltage should I match the activation device to?
Match the device's rated voltage to the lock's power supply — commonly 12VDC or 24VDC. Many devices are dual-voltage rated, but always confirm against the actual supply output, not just the lock's nameplate rating, since some access control panels regulate voltage differently.
Is a delayed egress device legal to install?
Delayed egress is only permitted under specific conditions in NFPA 101 and local building/fire code — typically requiring a local alarm, a maximum delay period (often 15 or 30 seconds), and automatic release on fire alarm or sprinkler activation. It's not a default option; verify code compliance with the authority having jurisdiction before specifying one.
What's the difference between a REX sensor and a push button for exit?
A REX sensor (typically passive infrared) detects motion or presence approaching the door and releases the lock automatically, allowing hands-free exit. A push button requires a manual press. Many installations use a push button as the primary code-required release and a REX sensor as a secondary or redundant method, per local code interpretation.
Does the activation device need to interface with the fire alarm system?
Yes, in nearly all jurisdictions — electromagnetic locks are generally required to release automatically on fire alarm activation and on loss of building power, independent of the request-to-exit device. Confirm the activation device and lock circuit are wired through the fire alarm interconnect required by local code.
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