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MCB after or before relay

MCB after or before relay

MCB after or before relay

(OP)
Usually an MCB or fuse is place before the relay.
What will change I place first the relay and after that the MCB like in diagram B?

[url=http://postimg.org/image/d4ro6m0zz/][/url]

RE: MCB after or before relay

Diagram 'A' looks correct. An MCB downstream of the relay offers limited protection to the relay, where upstream it offers full protection if correctly sized.

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