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Had a quick look at the links. Didn’t see anything relevant to a possible failure of a RCBO. I’m sure all the theory behind the electrical engineering side of things is fascinating but I’ve had my fill of mathematical equations, even simplistic ones such as these, during my uni days...

45A is stated in the shower instruction manual. Would 50A be better?

Thanks for all your replies. Based on the fact that I should have a 45A fuse, plus the posibility that the RCBO may be faulty due to the lever not moving, I'll go ahead and arrange to have this replaced with a 45A unit. Thanks again.

The shower was fitted about 3 years ago as part of a complete bathroom re-fit. The contractor claimed to have all relevent qualifications and a member of the IEE. Although I have my doubts. The shower has a seperate CU and is wired with 10mm cables. This is the 2nd time I've had an issue...

Thanks for the quick response. Reading between the sarcasm you seem to be suggesting the RCBO should be 47A and you can’t get a 40Ma version. So assuming someone will be kind enough to respond to the ‘is the RCBO faulty’ element of my post and also assuming the RCBO need replaced, then I...

I'm having a problem with my electric shower that I hope is caused by the RCBO. Shower works for a few minutes then all power cuts out, including power to the pull switch. Thing is the actual switch on the RCBO hasn't tripped. But when I turn off the RCBO for a few minutes, then turn it...