Supco STC4300 Thermal Cutout 15 Amp 300°F/149°C

Supco STC4300 Thermal Cutout is a temperature-operated safety control used to interrupt electrical circuits when excessive heat condition are detected. It is rated for 15 amps, and activates at 300F (149C), responding to abnormal temperature rise by opening the circuit. This component is commonly applied in furnaces, air handlers, and other HVAC systems, where over-temperature protection is required for controlled operation. Installed in the sensing area of the equipment, it help regulate system shutdown during high-heat condition and resumes normal circuit continuity once temperatures return to safe level.