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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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  • 0

    PFR.pdf

    The busbars are fed either from the generator or mains supply, never both.

    To me, the pfr will indicate “mains available” when the generator is supplying the site ?

    The naming could probably cahnge to power available ?

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  • 0

    PFR.pdf

    The busbars are fed either from the generator or mains supply, never both.

    To me, the pfr will indicate “mains available” when the generator is supplying the site ?

    The naming could probably cahnge to power available ?

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