In my garage there is a light switch - it ought to be simple - the cable from the power supply comes into the switch and then goes out to the light. Most of the simple switches in the market seem to just switch the live and you don't bother cutting the neutral.
However my switch has both wires cut and the switch has 3 terminals - one called Com and the others called L1 and L2. Both neutral cables are connected to L2 and the live supply is connected to L1 with the red light cable connected to Com. When the switch is off it would appear that L2 is connected to Com (so the light is off) and when the switch is on, L1 is connected to Com so the light comes on. This seems to make sense and it sometimes works ok.
However, for as long as I can remember, turning off the light switch periodically breaks the circuit breaker - perhaps because of leakage of current when the switch jumps across. To avoid this I have been leaving the light on and just using the circuit breaker to turn the lights on and off but I have now got around to trying to fix it. My first attempt was to replace the switch with an identical one in case the switch was faulty but that didn't work - indeed it just damaged the new switch and I have had to revert back to the old one.
Please can you tell me is this a normal way to wire a light switch. If not, is my guess above a reasonable explanation for the circuit breaker problem (ie the switch should not be wired in this way)? In which case is there a simple cure apart from starting with a fresh wire and buying a simple switch - eg how could I join the neutral wires back together?
Alternatively if my guess is not right, how would I find out the cause of the circuit breaker breaking.
Thanks
Bruce