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Can an RCD be fitted onto the outgoing way of an Isobar and Acti9 Distribution Board?

The Isobar Distribution Boards outgoing ways are designed to be fitted only with C60H and iC60H MCB's up to and including 63A, and RCBO's up to 45A

RCD's and other din rail devices cannot be fitted. They should be fitted on a din rail.
- Incase of single phase boards, a multiservice single phase distribution board has a din rail already fitted. 
- As for a three phase board an extension box with a din rail of 17 single pole ways part number is MGBNEX034N for MGBN boards or SEA9BNEX034N for Acti 9 distribution boards.
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