The 5276 Series of heavy duty push button assemblies provide conspicuous, door release for electric door locks. These, easy to operate, request-to-exit controls are in compliance with NFPA 101 code requirements for access controlled egress doors. These devices can be mounted onto standard gang junction boxes or flush mounted in a vertical door jamb for an easy and clean installation. The gang box (not included) should be sized to accommodate the switch mechanism and wiring connectors. The 5276 series push button switches are furnished with a 1" diameter button with a protective chrome ring. This push button cap is supplied in Red, Black or Green color to meet the specific application requirements. Dual contacts, one normally open set and one normally closed set are furnished as standard. This allows the magnetic lock power to be cut by the normally closed contacts upon switch activation while simultaneously signalling an access control panel with the normally open contact block. Since both sets of contacts are electrically isolated from each other, there are no problems with voltage compatibility. The P23DA time delay is a totally mechacnical, non-electric operation. The switch is a spring device with a pneumatically controlled return action. The time delay can be field adjusted for a delay time of 2 to 60 seconds upon release of the push button.