This is a small water Heater tank. It’s in the water dispenser. I have pulled it out from the water Dispenser. it has two points, Neutral and Phase.
Overload is attached with this water tank for automatic trip when temperature complete. we should always attach overload (temperature sensor) for automatic trip Otherwise our heater will continue to run.
In Some water heater tank attach 1 overload (temperature sensor) and in some attach 2 overload (temperature sensor).
if 1 Overload attach with water Tank then neutral attach direct and phase attach with overload
If 2 Overload attach with water Tank then neutral attach with 1 overload and phase attach with second overload