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ABB REF 545 Back Up Protection Relay

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fb599

fb599

Electrical
Joined
Oct 25, 2001
Messages
32
Location
GB
Has anyone had a failure of this type of relay that could have possibly issued an "open" command to a circuit breaker without receiving such an instruction ?

Any help welcomed.
 
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fb599 -

Is your REF545 an SCU (Switchbay Control Unit)? We have ABB's REF542 which is an SCU and have had one such incident in the past. Please give more details of REF545.
 
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Thanks for the early reply. Yes, this REF 545 is providing back up protection to a circuit but it also controls the circuit breaker too. ie remote control and MMI local control.
 
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