Carrier HH12ZB170 3" SPST Auto Limit Switch L170-40

The Carrier HH12ZB170 3" SPST Auto Limit Switch L170-40 is a control part that interrupts the electrical circuit when the monitored temperature reaches its specified limit, protecting compatible equipment from excessive heat. Its internal sensing element reacts to rising temperature and automatically restores the circuit after the temperature falls within the reset range. Positioned in the designated thermal sensing position HVAC systems to respond automatically whenever abnormal heat levels are detected inside the equipment. It contributes to controlled equipment protection by preventing repeated exposure to extreme temperatures and maintaining proper response from the safety control circuit.