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740 Series Emergency Break Glass Release

Schlage 740 Series emergency break-glass release products allow normally locked doors to function when emergency egress is needed. 3 models include release only (standard), release with visual LED or release with audible signaling. Includes 4 replacement lens disks.


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Schlage 740 Series emergency break glass release products are designed for use as an emergency release of doors not normally used for daily ingress/egress. These may include laboratories, testing areas or other similar work rooms. It is also used in fail safe, multiple door interlocks and perimeter protection systems that involve the central control and potential lockdown of electronic locking devices, as an on-site emergency release. A “break glass” solution may be preferred in many situations over a conventional "pull box" installation because it is less vulnerable to misuse or tamper actuation.

The 740 Series emergency break glass units consist of a replacement break glass cartridge that normally holds the plunger-activated switch depressed until the cartridge lens is broken. When the lens is broken, the plunger moves forward and alters the switch contact position.

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System Accessories

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  • Compatible with all fail-safe types of electronic locking systems
  • An effective alternative to the conventional pull box types in reducing false alarms and tampering incidences



  • Mount to wall over a standard three-gang enclosure
  • Use in laboratories and isolated areas where emergency release of a door not normally used for daily ingress/egress is needed
  • Emergency release options for door interlocks or buildings with perimeter doors on a centralized access control system (where permitted by code)



  • Stainless steel plate and fittings
  • Options include LED and audible alert models to provide warning of emergency use or tampering


  • 740: Includes break glass switch assembly and hammer mounted to a silk-screened 3-gang stainless switch plate
  • 741: With indicator light
  • 742: With Sonalert horn operating at 80 dB @ 2 ft


Contact rating

  • 6A @ 30 VDC, form Z switch


Additional information

Refer to the data sheet

Category information


Product information


Technical resources

In accordance with California PROP65 - WARNING WARNING: Cancer & Reproductive Harm

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Additional Resources

Did You Know?

Walter Schlage patented the first “smart home” device in 1909—a door lock that also turned the home’s lights on and off.

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As part of Allegion’s family of pioneering brands, Schlage benefits from the strength, efficiencies, resources, and integration from a global power. In turn, we pass those advantages on to you.

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