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Phase failure relays (pfr)

Derek Eccles

Is it standard practise to fit pfr's to the breaker side of an MCCB, rather than the supply side in a motor control panel which has a standby generator connected, in case of mains failure ?

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    Looking at that drawing and feeling slightly dense, what exactly is the load that must be  disconnected if one phase fails, and how is that achieved ?

    I presume the fault you  are guarding against with the phase fail tester is the loss of only one of  fuses F1/F2/F3  is that correct 

    Is everything after that point ganged MCB or similar 3 or 4 pole switching?

    Mike.

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  • 0

    Looking at that drawing and feeling slightly dense, what exactly is the load that must be  disconnected if one phase fails, and how is that achieved ?

    I presume the fault you  are guarding against with the phase fail tester is the loss of only one of  fuses F1/F2/F3  is that correct 

    Is everything after that point ganged MCB or similar 3 or 4 pole switching?

    Mike.

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