There are different types of circuit brakers in houses: the standard one's, RCB, only switch out on overload or short circuit, however others watch for loss between the fase and the ground,RCBO's,: I think it will be this one's that trip in your house.

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Had a look- it's a Lanson LAN45RCD240. Looks like an RCD which is looking at the current difference between the active and neutral.

Storagewise- have turned these Macs on for about 5 or so years and have been stored away in the same storage room in the garage.