America's #1 provider of automatic gate equipment | Call Anytime (800) 555-6017

Liftmaster LM21XPBB Release Device with Battery Backup

Liftmaster LM21XPBB Release Device with Battery Backup

Liftmaster LM21XPBB Release Device with Battery Backup

Regular price
Sale price
Your Price: $949.99
Quantity must be 1 or more

Liftmaster LM21XPBB Extended Performance Release Device with Battery Backup

***Special order. Not eligible for return***

The LiftMaster® LM21XPBB Release Device is a UL/ULC listed normally energized fail-safe device designed for use on rolling doors, single-slide, center-parting level and inclined track doors. This device is a normally energized fail-safe releasing devices incorporating state-of-the-art electronic control circuitry. The release device responds to emergency conditions generated from an automatic initiating device and is used in conjunction with a fusible link system. The release device can be powered from 120Vac, 24 Vac, or 24Vdc. The24Vdc cannot be sourced from a fire alarm control panel or UL1481regulated power supply. The devices can be activated via a smoke detector or an alarm relay from the panel’s Form C dry contact relay.


  • UL 864 Revision 9 compliant.
  • Selectable 10, 20, 30 or 60 second delay on alarm.
  • Closed door detection capabilities.
  • Form C relay outputs for the transmission of alarm and trouble signals transmitted to the fire alarm control panel.
  • Testing function allows routine fire door testing without requiring activation of the smoke detector.
  • Audible trouble sounder to indicate when the release device is not operational.
  • Diagnostic feedback LEDs.
  • Battery backup for the release device and accessories.
  • Battery management system that can provide 24Vdc power for up to four smoke detectors and two horn strobes.


Download Manual