Type C breakers

Mar 14, 2010 5 Replies
B

In the past I have installed type C MCBs on circuits where large motors would normally trip standard Type B MCBs during start up. Eg in workshops and garages belonging to woodworkers.



I recently went to get one to fit a Volex CU and see that Volex and a few other suppliers are only supplying Type C overload protection in RCBO breakers. Trouble it Type C MCBs are about £4-5 and RCBOs are nearer £30!



Anyone know why Type C breakers are disappearing? Is it to do with a regulation change? if so why are other makes still supplying Type C MCBs?



Anyone from the trade know what is going on please?



Secondary question which other makes of MCBs fit Volex CUs



Cheers



Bob


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A

Type C are normally used in commercial/industrial situations, so you'll have more luck if you pick a CU which is also used in commercial/industrial situations.

For home use, combining a Type C with an RCD does make some sense - it removes the more stringent earth fault fault loop impedance which would otherwise be required for a Type C, and it may be that this is something which is less likely to be checked (or even understood) by domestic electricians.

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A

Wylex do C Type MCBs and these are usually a direct replacement for Volex MCBs.

Adam

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C

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Look here for good prices:

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Cic.

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B

Thanks for the replies guys

Bob

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A

I notice that in the TLC catalogue that it mentions some design change to Wlylex TP boards and compatability with some MCBs.

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Maybe a call to Electrium (they make both Wylex and Volex) may be in order.

Tel 01543 455000 and ask to speak to the technical department.

They will not bite!

Adam

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