Quote Originally Posted by paulus.v View Post
My type B circuit breaker was tripping from the toroid PSU but only in winter at lower temperatures. I have changed it with type C and never had any problem.
Neale, what capacitor value do you have in your PSU?
Not sure but I'm going out to the workshop shortly and I'll take a look.

Actually, thinking about it, I believe I have a 10A C curve MCB in the control box itself. There is then a 13A fuse in the mains plug (UK standard practice) and then a 32A B curve MCB in the mains distribution box (consumer unit in UK terminology). So I take back what I said about B curve - that's much higher value and upstream of the control box itself.