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How to prove an MCB functions correctly?

Paul Brewerton
Is there any way of proving that an old Crabtree C50 MCB functions correctly?

Modern equipment comes with certificate of conformity and is traceable, but we are having to use an old breaker in an old board, and would like some confidence that it is actually fit for purpose.

TIA
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    The client has gone with a sensible option, and that is to renew and feed via a modern 60898 mcb. So no need to test the old breaker.

    However it is interesting reading the other opinions on here, and who knows, we may need to test mcbs in the future.
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    The client has gone with a sensible option, and that is to renew and feed via a modern 60898 mcb. So no need to test the old breaker.

    However it is interesting reading the other opinions on here, and who knows, we may need to test mcbs in the future.
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