Can you get both a shunt trip and UVR on a Powerpact H, J, L, M, P, or R frame circuit breaker?
Issue:
Is it possible to install both a shunt trip (MX) and an undervoltage release (MN) in a Powerpact H, J, L, M, P, or R frame breaker?
Product Line:
Molded case circuit breakers
Resolution:
No, Powerpact circuit breakers can accept only one shunt trip or one UVR (undervoltage release).
However, you can use an UVR to get both shunt trip and UVR functionality as follows:
Is it possible to install both a shunt trip (MX) and an undervoltage release (MN) in a Powerpact H, J, L, M, P, or R frame breaker?
Product Line:
Molded case circuit breakers
Resolution:
No, Powerpact circuit breakers can accept only one shunt trip or one UVR (undervoltage release).
However, you can use an UVR to get both shunt trip and UVR functionality as follows:
- Install a UVR in the breaker
- Supply it from the control power source, going through NC (normally closed) contacts on a relay. This gives you the UVR function plus a means to open the circuit as you would with a shunt trip
- To obtain the shunt trip function, supply the relay coil from a switched control power source as you would a shunt trip. When you activate the switch and energize the relay coil, the NC contacts open, dropping voltage to the UVR, tripping the breaker.
Released for: Schneider Electric Canada
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