"Dorothy Bradbury" wrote in message
...
RCDs technically are not supposed to be used as on/off devices re cycle
life:
o I have often wondered how long they survive used as a main switch
o Particularly where the test-button is used to power off the house, 250
cycles?

I've used the test button on a dedicated RCD to power down our barn every
night for years.
Never failed yet (famous last words :-)