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What does the LED mean on the RXM021BD?

 Issue:
There is an LED on the varistor, RXM021BN.  What does this indicate?

Product line:
Zelio relays RXM

Environment:
n/a

Cause:
n/a

Resolution:
The LED only indicates that Power supply is present.  If the power is not available, the LED will go off. 

 
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