Years ago we had trouble at work with a hefty circuit breaker that used to POP under certain conditions when a Hecla Brand stainless steel kettle began to boil.
I found this generally happened only when the room heater (oil) was running and the room was fairly hot.
The circuit breaker board was mounted high on one wall near the low ceiling (8 foot) and was the hottest area due to the natural air draft of the room.
This was long before those RCD switches were ever thought of but after several experiments, this only 'popped' as the Kettle reached Boiling point and the air was hot around the board.
Its a shame you cant bypass the RCD because along with the others, I think its most likely at fault.
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