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MCB problem

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  • 08-12-2007 3:49pm
    #1
    Liam2
    Closed Accounts Posts: 6 ✭


    A switch on my mcb tripped and won't go back up...anyone any idea why this happens please


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    #2
    jasonos
    Closed Accounts Posts: 45 ✭jasonos


    Is it shorting. does it make a bang noise when u try turn it up


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    #3
    Liam2
    Closed Accounts Posts: 6 ✭Liam2


    No...it doesn't bang....it's not gone down fully but the circuit is dead and when I try to push it back up it won't stay


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    #4
    northdublin
    Closed Accounts Posts: 459 ✭✭northdublin


    could be faulty, try tapping it with the back of a screw driver to dislodge the spring inside, failing this if its on the same circut as the rcd ie its a socket mcb switch of the rcd and try put it up. if its on the lighting/heating circut turn of the mains and see will it stay up.
    certain mcb have to be pushed down fully after they trip before they can go up.


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    #5
    dolittle
    Registered Users Posts: 706 ✭✭✭dolittle


    switch it fully off and then back on, it sounds like it is in the middle (trip) position


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    #6
    Sparky
    Registered Users Posts: 22,231 ✭✭✭✭Sparky


    Most MCBs will not go down fully. This is to stop you sticking sellotape etc etc on it to keep it up. Its a safety feature.
    Pull it down fully till it clicks and push it back up fully. If it instantly trips, you have a constant fault.


    What you need to do is:
    1. identify the circuit
    2. Remove all plugged in appliances
    3. Switch up breaker
    4. If breaker holds, plug in appliances one by one.
    Depending on the circuit involved, if it doesnt trip, keep an eye on it and note when it does trip.

    Its common this time of year for trips to happen as it gets very cold and damp


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