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Rattly MCB

Joined
3 Sep 2004
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United Kingdom
Just bought a new B50 Crabtree Starbreaker MCB to connect my new electric shower at the CU. The MCB rattles as if something is loose inside. Is this normal or should I return it for a replacement?
 
since you know it rattles, i would assume you havent put it into the CU yet. in which case its probably because the terminal screws are loose
 
Most MCB's rattle - it's due to the mechanism inside needing to have some tolerance for operating the magnetic tripping coil device.
 

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