This is a Brand New OEM ICP/Heil/Tempstar Limit Switch rated at 350 Degrees with a manual reset button (L350F-MR) . It replaces the old part numbers listed below.
A limit switch is a safety device designed to shut down a piece of equipment. Limits have a set point, which is in some cases, adjustable. The set point prevents the temperature or pressure from exceeding the rating of the switch.