Carrier HH12ZB240 Limit Switch Precision Thermal Sensing: Features NTC

Precision Thermal Sensing: Features NTC thermistor logic with 10 kΩ resistance at 77°F

Specifically designed for versatility

and P331-2206

Enhanced Wire Management: Features internal set screws and a dedicated copper ground bar for secure

preventing total system failure during minor electrical transients

Carrier HH12ZB240 Limit Switch Precision Thermal Sensing: Features NTCThe Carrier HH12ZB240 is a high limit OEM replacement part engineered for precise thermal regulation and safety in Carrier, Bryant, and Payne gas furnaces. As a normally closed (NC) switch, it is designed to protect the heat exchanger from damage caused by restricted airflow or blower failure. This auto limit switch functions on a specific thermal cycle, opening the circuit when internal temperatures reach 240F to interrupt the gas valve and closing