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Characteristics of Type B and Type C MCBs for motor circuit.

Alan B

From my reading and pervious discussions on this forum my understanding is that for very short term overloads the tripping characteristic for type B and type C devices is the same.

i was then thinking why do LED manufacturers recommend type C protective devices due to inrush current, which I would assume is very short term.

The reason I am asking the question is that I am wiring up a large compressor which requires a 32A circuit breaker (don't have access to the instructions at the moment). My plan was to use a type C device because of in rush currents, but struggling to get hold of one.

If the difference between type B and type C MCB's/ RCBO's  is only for longer term overloads would using a type C device actually make any difference and am I wasting my time trying to get hold of one.

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    Thanks, long day, eing lazy and not looking in books :-(. Sorry for wasting your time.

    The board is from a company called Live. There are a few stockists. I am sure i will find the parts, just wanted to avoid another 10.00pm session placing orders.

    Had two orders I placed on Sunday go wrong because supplier wasn't showing accurate stock levels, need to fix both of them now.

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  • 0

    Thanks, long day, eing lazy and not looking in books :-(. Sorry for wasting your time.

    The board is from a company called Live. There are a few stockists. I am sure i will find the parts, just wanted to avoid another 10.00pm session placing orders.

    Had two orders I placed on Sunday go wrong because supplier wasn't showing accurate stock levels, need to fix both of them now.

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