This thread is in a similar vein to
this one from two years back.
In our flat, power is supplied to a fairly usual 30mA RCD, downstream of which are four MCBs.
For some months, the RCD has been tripping whenever the cooker, and also recently other high-wattage appliances such as the washer or air con have been in use for roughly 5-8 mins. None of the circuit breakers have ever tripped.
The main question is this:
why, when the RCD trips, does it do so 'internally' - i.e. power is cut but the switch remains in the upper (on) position?
Today I bought and fitted a new RCD module, but this has not solved the problem as it cut out in exactly the same way (power off, switch up) after I tried using the oven for a celebratory pizza! I had no idea that this could happen under normal operating conditions but that is now two devices exhibiting the problem.
As to causes, I have a few ideas but will leave it for now. Any thoughts welcomed.