Thread: Wiring home and limit switches
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27-09-2010 #12
Yes the normal arrangement is to use a contactor with a low voltage (under 50v, typically 12 or 24) relay coil. The contactor is normally open, and you close it manually which energises a small transformer which provides power to the contactor coil via the kill switch, thus holding the contactor closed. Hitting the kill switch interrupts the power to the coil causing the contactor to drop out. This arrangement prevents it being re-energised accidentally in the event of a power failure. You have to manually close the contactor and it wont stay closed unless the power is on.
Another, cheaper, arrangement uses a 10A 240v NO relay (4 contacts) with a 12v coil and a low voltage transformer as used for lighting. This requires a start switch to energise the coil which is then held energised by the relay via the kill switch.
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