Carrier HH18HA430 Limit Switch 323613-751 It is designed for tri-state

It is designed for tri-state (floating) or two-position control logic using 24V inputs

Universal Compatibility: Fully identical to the 40003916-521/U model

This motor features reversible rotation

heat exchanger cracks

Carrier HH18HA430 Limit Switch 323613-751 It is designed for tri-stateThe Carrier HH18HA430 Limit Switch is a critical safety component designed for precise thermal regulation within high performance HVAC systems. As an OEM Carrier replacement part, this auto reset limit switch features a calibrated 100 130F temperature range, ensuring the system maintains safe operating parameters by interrupting the circuit when the high limit threshold is reached. Engineered for reliability in the field, it functions as a furnace