Trane CNT3159 SPNO High PSI Switch 400 Open 250 Close

The Trane CNT3159 SPNO is a high-pressure safety switch Single Pole, Normally Open used in many Trane HVAC systems. It watches pressure levels and acts as a safety device to prevent equipment from being damaged. In this case, when the pressure goes above 400 PSI, the switch opens the circuit, shutting down the system. Once the pressure goes below 250 PSI, a safe operating range, the switch automatically resets so that the system can be restarted. This pressure switch can take up to 6 amps at 120 or 240 volts and works between -30 and 85 degrees Celsius.