EM20 Emergency Bypass Relay EM20 Emergency Bypass Relay

Emergency Bypass Relay EM20

Model: EM20

The ILC Emergency Bypass Relay (EM20) is a UL 924 device providing automatic bypass operation for emergency powered lighting when normal power is lost to the relay. The EM20  bypass relay also has a normal power control input allowing the EM20 to switch the EM light to match normal lighting control saving energy by turning off the EM loads when not  needed. During an emergency state it will ignore any local control until the normal power is restored. The EM20 is provided with a switch loop that can be used for a test switch or  connection from a fire alarm or BAS system.  


Emergency Bypass Relay EM20

Wiring Diagrams

Emergency Bypass Relay EM20 (WD0200)

EM20 Bypass Relay and LLEVO-INT-2 (WD0205)

Installation Guides

Emergency Bypass Relay EM20



  • Automatic revert to ON operation 
  • Test switch loop provided 


  • Dimensions 3.25” x 1.75” x 1.44” 
  • Plastic enclosure 
  • ½” nipple for mounting to electrical box 
  • 8” wire leads for connections provided 
  • Color coded leads for easy wiring 
  • Conduit nut provided 


  • Input: 120/277VAC, 50/60Hz, 0.25A 
  • Output: 20A @120/277VAC 

Test Switch Loop: 

  • Dry contact closure (N.C.)  

Operating Environment: 

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


  • UL 924 
  • FCC 
  • Plenum rated UL 2043
  • Made in the USA 
  • UL 924 rated 
  • Rated for 20Amp @ 120/277VAC  
  • Normal control follow operation 
  • Switch loop for test switch or fire alarm system 
  • UL and CUL listed 
  • Plenum rated assembly 
  • Direct mounting at power junction box or light fixture with 1/2” K.O.