It would seem odd for a 40A switch to burn out with the 5A or so drawn by a power shower? These showers do not heat the water they only have a small motor and pump to increase pressure. Maybe some back EMF from motor or wrong names have been used and it's not a standard power shower?
i got this wrong...its an electrically heated shower...should have said an electric shower
cold feed only under pressure
apologies for misleading
cheers
geof
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Some unhelpful squabbling posts have been removed
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