The Cutler Hammer-Eaton H2008B-3 Class 20 Heater Standard Trip is a thermal overload heater element designed to protect electric motors from overheating and excessive current conditions in HVAC systems. It works with compatible overload relays by sensing motor current and generating heat proportional to the load, tripping the relay when unsafe operating conditions occur. Commonly used... https://www.partshnc.com/h2008b-3-cutler-hammer-eaton-323-523a-heater-pck-set-of-3