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Just thought of something else to ask, as you do. The 40 amp MCB comes with a 6kA, 10kA and 15kA rating and I read somewhere recently that the 6kA trips fewer times than the 10kA. Which would be best for a shower?

I need to install a 40 amp mcb and search as I may I cannot find a like for like replacement anywhere. Does it have to be a MEM 40 amp MCB (AB40SB)(Type B) or is there another make that will fit in this consumer unit? It's for a 9.5KW shower and I still have one slot available on the left of all...