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Crestron® Power Loss Sensor-3-Phase
Crestron® Power Loss Sensor-3-Phase 0
Crestron® Power Loss Sensor-3-Phase 1

Crestron® Power Loss Sensor-3-Phase

Model #: GLS-PLS-120/277
At a Glance
Crestron® Power Loss Sensor-3-Phase with 120 or 277 volts and used to satisfy UL 924 requirements
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Get to know this product.

  • Senses loss of power on each leg of a 3-phase feed
  • Used to satisfy UL 924 (Emergency Power Equipment) requirements
  • Works with 120 or 277 Volt feeds

The GLS-PLS-120/277 is a 3-Phase Power Loss Sensor designed for use with Crestron Green Light™ systems to activate Override mode during a power failure. In response to a signal from the GLS-PLS-120/277, the lighting system program can be temporarily overridden while designated emergency lighting circuits are changed to their override preset levels and unnecessary lighting and other devices are shut down to minimize the demand on emergency power equipment.

The GLS-PLS-120/277 senses each leg of a 120 or 277 Volt 3-phase feed, providing LED indication of the status of each phase on its front panel. When power is lost on any phase, the corresponding status LED turns off and a contact closure is activated on each of two control outputs. Two isolated control outputs are provided to allow for interfacing with third-party equipment in addition to the Crestron lighting system. Each contact closure output is rated for 1A @ 24VDC.

Testing the GLS-PLS-120/277 is facilitated using three Test Switches located behind a small cover plate on the front of the unit. Setting any switch to the TEST position simulates a loss of power on the corresponding phase leg, providing a test of the unit's internal circuitry and any connected equipment.

The steel enclosure is designed for mounting to a vertical surface. Conduit knockouts are provided on the bottom, top, and both sides. All electrical connections are made via screw terminals accessed by removing the front panel.

Key Features

  • Senses loss of power on each leg of a 3-phase feed
  • Used to satisfy UL 924 (Emergency Power Equipment) requirements
  • Works with 120 or 277 Volt feeds
  • Designed to activate the Override mode on Crestron lighting modules
  • Provides two isolated contact closure outputs
  • Each output rated 1A @ 24VDC
  • Includes built-in test function for each phase input
  • Surface mount enclosure includes conduit knockouts


Compatibility:CAEN; CAEN-MLO

Misc. Specs

Product Weight (lbs.)3.7
Width (in.)5.19
Depth (in.)2.82
Height (in.)12.69
WarningProposition 65 Warning for California Residents