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Emergency Lighting Control Unit for KO Mounting

ELCU-200 Wattstopper
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Wattstopper’s ELCU-200 Emergency Lighting Control Unit is a self-contained device that allows any standard lighting control device to control emergency lighting in conjunction with normal lighting in any area within a building.

Voltage 120/277 VAC


  • Eliminates energy waste caused by emergency lighting that is always on
  • Integral push-to-test button activates emergency mode for a true test condition
  • Connects to EMTS-100 Remote Test Switch or other input to activate emergency on from a remote location
  • Operates as a control device or as a shunt
  • Senses local single circuit power failure
  • Zero cross switching technology for reliability and increased product life
  • Compatible with Wattstopper occupancy sensors, daylighting controls, lighting control panels, and dimmers


General Info
Product Line Wattstopper
UPC Number 754182923052
Country Of Origin China
Product Width US 3.0 in
Product Weight US 0.43 lb
Product Volume US 25.8 cu in
Product Depth US 4.0 in
Product Height US 2.15 in


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Questions & Answers

Is this compatible with 277 volt emergency and 120 volt normal power, fixture drivers are multi-volt.

Asked by: Jimmy P.
Hi Jimmy, Yes, it is, please follow the wiring diagram and keep the different voltage neutral wires isolated.
Answered by: Tier 1 Tech Support
Date published: 2022-12-16

Can i use the ELCU to control/dim a LED fixture with integral emergency battery?

Asked by: WL
Good morning The ELCU does not have dimming capability so if you are trying to dim LED fixtures I would recommmend that you use a control modular like and LMRC 211 which is 0 to 10 volt dimming with the ELCU.
Answered by: Tier 1 Tech Support
Date published: 2022-09-15

Re: ELCU-200-347 Are the contacts rated for 20 amps , the spec sheet indicates 16a @120-347VAC Max Load Requirements . Please Clarify Thanks

Asked by: David
The ELCU-200-347 is rated for 16amps @120-347vac
Answered by: Tier 1 Tech Support
Date published: 2022-11-25

Good afternoon, can you control different lights in different rooms with one unit? Or do you have to install one device per room.

Asked by: Roman
You could if you run the lights in parallel but when you are trying to control certain lights in one area other lights may come on that you may not want to use at that moment in another area. I would recommend one per a room.
Answered by: Tier 1 Tech Support
Date published: 2022-06-21

Is the EL-CU-200 rated to switch LED drivers?

Asked by: Joseph
Yes, it can switch up to 20A of LED fixtures. But I would de-rate your load to much less because of the LED inrush and other issues. A 10A LED load is huge these days.
Answered by: Gordo
Date published: 2021-02-05

I have my switch pack and ELCU on an emergency circuit. I know that my normal power sense has to come off the non EM circuit but can my switch sense wire come off the EM circuit or does it share a neutral with the normal power sense?

Asked by: thomas giner

Installed ELCU to interface with the fire alarm system. cut the Test Loop wire andbconnected to the other ELCUs on the entire floor. After fixing the polarity of the run I installed the final ELCU, now all Emergency lights turned on and there is clicking?

Asked by: Brian D.
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