Emergency door releases are used in access control systems to provide permanent / semi-permanent switch to either open or close a circuit.

This examples shows a "Fail Secure" and "Fail Safe" scenario. For a "Fail Safe" setup, the break glass or button is activated, power supply then releases power from the lock, and if power is lost then the lock also releases.

Wire in NO or NC depending on the access controller used and also on the required state of the lock during a "Fail-safe" or "Fail-secure" scenario.