When my freezer warning light comes on I want it to trigger a relay to open a pair of alarm contacts on wireless alarm, if I get a relay with 240v AC Coil can I wire it onto contacts at rear of warning light so when warning light comes on it will trigger relay & open volt free contacts to activate alarm, do I need any type of circuit on power to relay or just feed 240v AC striaght into coil terminals, I am hoping the warning light is 240v will have to get panel off & test it (Vestfrost Chest Freezer) bungalow 60ft from garage with freezer & I have a small wireless alarm to do job. I have used relays on 12v DC for split charging & on alarms to trigger flood lights with no extra circuits, it's only way I can think to do it, someone should make one to trigger contacts from a digital thermometer but can only find ones with small buzzers.