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Al vs Cu for MCB rivets

Al vs Cu for MCB rivets

Al vs Cu for MCB rivets

(OP)
what is the best rivet type to be used for 10kA(short circuit capacity) MCB rivets?

can Al rivets withstand higher kA rating or is it Cu rivets?

RE: Al vs Cu for MCB rivets

What makes you think either is the dominant factor in breaking capacity?

I've never seen an MCB of that pattern fail due to the rivets snapping. I have seen casings burnt through in one or two instances, one being when the MCB was mis-applied in a highly inductive DC circuit and the other being when they were mis-applied inside an MCC where the fault level was considerably higher than the breaking capacity.

RE: Al vs Cu for MCB rivets

(OP)
should a 10kA MCB be riveted with Al rivets or Cu rivets?

RE: Al vs Cu for MCB rivets

No-one here can help you. That is part of the overall breaker mechanical design and would require FEA of the case to determine what should be done.

I can say just by the color that the breaker in your picture isn't using copper.

RE: Al vs Cu for MCB rivets

Could be tinned copper Lionel. winky smile

I actually am fairly sure that Schneider make as little as possible from copper in order to minimise cost, and the rivets are aluminium alloy.

RE: Al vs Cu for MCB rivets

Yes, from a cost standpoint no-one is going to pick copper for that purpose.

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