Review on ⚡ Reliable Emerson 380 Relay Volt Coil for Efficient Electrical Control by William Mahajan

I replaced my thermostat with a smart thermostat - and this required the use of a 'common' connection to ensure uninterrupted power to the thermostat . Unfortunately, my water heater only had a 24VAC output to turn on/burn, and the thermostat didn't get power after it was connected. The solution was to add a separate 30V thermostat AC transformer that was used to power the low water boiler cut out sensor and switch this relay, completely isolating the boiler thermostat/power control connection from the low voltage boiler switch. (In the process I also discovered that the low water level sensor wasn't working and replaced it. This was troubling as the low water shut off sensor wasn't working when it was 'closed'.) So far this seems to be working great.