The Emergency Door Release is designed to override the electrical locking/release devices, in the case of a loss of power to the emergency exits. It
Comus CP54SGSC Resettable Green Emergency Door Release Point W
Flameproof and Hazardous Location Break Glass and Push Button Call
Health and Safety Services: Emergency Door Release Systems, the
Flameproof and Hazardous Location Break Glass and Push Button Call
How to reset an emergency door release unit.
Sentry Safety 510 A Alarm Single Point Side Latch Rim Surface
Universal Keypad & Proximity Card Reader (PRX-320)
Green Callpoint (Door Release), Product
Resettable Fire Alarm Emergency Door Release Button