I'm living in the share accommodation where Upstairs bathroom is just right on top of downstairs bathroom which it was extended( not the original plan).
The upstairs bathroom used to leak to downstairs bathroom and causing some electrical faults when you switch on the downstairs bathroom...
If the shower itself is 9.5kW.
I = P/V . So, 9500W/240V = 39.58A
This means the shower itself will draw 39.58A, which is slightly less than 40A at MCB. If there are other electrical stuff in the bathroom such as heater. The MCB won't be tripping when everything is "ON" in the bathroom, for...