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3 pole contractor fed from 3 separate MCBs

vantech

Hi,

Any issue having 3x single pole (single phase) MCBs, switched by a 3 pole contactor, feeding 3 different runs of lights? The 3 circuits will be on different phases. There will be a separate neutral for each circuit. 

Each pole of the contactor is rated for the connected load and the number of lights it’s switching. 

Generally contactors are fed from an interlinked 3 pole MCB, however for this setup we need to use single pole MCBs to prevent 1 circuit tripping the other 2 runs of lights if there was a fault of the need to isolate one of the circuits. 

Don’t foresee it as an issue as long as the contactor is labelled as having multiple points of isolation. To me this is no different than a big grid switch, or a contactor fed from fuses. 

Anyone think otherwise?

Thanks. 

  • 0

    I agree - no problem. Often you'd be in the same situation if the protective devices happened to be fuses.

    It's very common to have a contactor fed from several circuits - often the coil is fed from yet another (lower rated) circuit.

       - Andy.

  • 0

    No problem at all. Multi pole contactors are regularly used to switch multiple circuits together.

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