Eaton Mears Manual Hi Limit Switch 275-2663-00

Hi Limits Single pole rated at 25 amps with temperature rating set at 121F. Best results are obtained when the bulb is installed in a dry well or groove tube at or immediately before the heater.
This is a safety device! If it is found to be out of calibration, do not attempt to perform a field adjustment! Replace bad hi limit with a new one