LightLEEDer UL924 Relay Bypass Output Module LightLEEDer UL924 Relay Bypass Output Module

LightLEEDer UL924 Relay Bypass Output Module

Model: RBOM

The UL924 Relay Bypass Output Module (RBOM) is designed  for controlling lighting fixtures that are used as normal and emergency loads. The RBOM operates as a standard output module, but in the event normal power is lost, it forces the selected emergency lighting load relays ON, and bypasses all control in the panel. Each RBOM has 8 R-40 relay outputs, and selectable jumpers that can be set to "Force On", "Force Off", or "No Change" from the current state. The module is provided with a test switch for testing the emergency function, along with connectors for an external switch and status LED for an external optional switch station. An optional UL924 Phase Monitor Module is also available for monitoring more than local power phase, along with high voltage dividers to separate Emergency and Normal power in the panel.


LightLEEDer UL 924 Relay Bypass Output Module

Wiring Diagrams

Remote EM Test Switch Wiring Details



  • 5.0" wide X 3.5" high
  • Push-on ribbon cable connectors for each relay
  • Push-on ribbon cable connectors for data in and out connections
  • Push-on power inputs and outputs
  • LED power and test status indicator
  • Terminals for remote test and status


  • 24 VAC

Operating Environment:

  • Location: Interior space
  • Operating Temperature: 0° to 50° C
  • Humidity: 10% - 90% Non-condensing
  • Atmosphere: Non-explosive/corrosive
  • Vibration: Stationary

Certifications and Approvals:

  • UL 924

Technical Bulletins

UL 924 Lighting Control With 0-10V Dimming (TB0017)

  • Made in the USADigital CAT-5 Ready
  • Bypasses relay control of designated emergency lights during a power outage
  • Controls emergency lights to follow during normal operation
  • Operates like a normal output board until normal power is lost
  • Mounts in place of a standard LightLEEDer output module
  • Forces relays on, off, or no change
  • Test switch and LED status indicators
  • Remote test switch and status capable
  • 8 relay outputs per module, 4 per side
  • Controls R40 relays, 1, 2, or 3 pole
  • Optically isolated outputs for protecting electronics
  • Push-on connectors for easy installation
  • Eliminates expensive bypass relays