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I've had a few that don't operate within spec the first time you test them (using an rcd tester at a socket). They can become a bit sticky which is why you're supposed to press the little button every 6 months and then switch it back on. That button might say test but it's not testing the response time just the circuit breaking.
Airhead
Presumably it is tested on some sort of schedule? Aren't you supposed to test your RCD every 6 months? Hands up all the people that do that.
Do they actually fail often?