the auto-reset mechanism restores the circuit

Technician-Grade Durability: Built for high-frequency switching to handle modern furnace duty cycles without premature failure or nuisance tripping

this component helps prevent the erratic hunting or failure-to-close issues often caused by flange leaks or improper compression

It is designed for standard sensing bulbs used in pneumatic and electric systems

this specific model is designed for 24V control circuits

Johnson Controls A99BB-25 Temperature Sensor the auto-reset mechanism restores theThe Johnson Controls A99BB 25 Temperature Sensor is a high accuracy PTC silicon sensor designed for precision monitoring in commercial refrigeration and HVAC applications. This passive Positive Temperature Coefficient sensing element provides a reference resistance of 1,035 ohms at 77? F (25? C), ensuring reliable data for system 450 controls, A419, and A421 series modules. The sensor is constructed with a stainless steel bulb and a 9 3 4 inch PVC