Carrier HK02ZB421 High Pressure Switch 610 PSI Open 420 PSI Close

The Carrier HK02ZB421 High-Pressure Switch, used for HVAC systems, to protect the compressor from being damaged. It is a safety part made of strong materials that functions like a pressure switch with the operation of a Single Pole or single Throw. This means that it has two terminals and can only be in on or off-state at any given time. The switch also measures the pressure within the system, it is designed to open the circuit at a maximum pressure of 610 PSI. When pressure rises above this safe limit, the switch disconnects the power supply to the compressor. This protects the compressor from working at high pressure which causes malfunctions or breakdowns of the machinery.