When you're troubleshooting a system that keeps short cycling or tripping on low pressure, the MARS 43349 Pressure Switch is the reliable fixed-setting solution you need in your truck. This SPST auto reset pressure switch is designed specifically for HVAC low pressure control, featuring a precise 35 PSI open (cut-out) and a 60 PSI close (cut-in) setpoint to protect compressors from vacuum damage and loss of charge. Built as part of the trusted Klixon 4-series, this switch features a hermetically sealed sensor and tamper-proof construction, making it an ideal choice for R22 systems and modern R410A applications where space is tight. It mounts directly on the tubing via a 1/4" female flare S.A.E. connection with an internal deflator, eliminating the need for extra capillary tubes that eventually leak. With 18-inch leads and a 100,000-cycle life at rated current, this normally open switch ensures your installs stay operational without unnecessary callbacks. Key Benefits for Contractors: Compact Direct Mounting: The 1/4" female flare connection allows for fast, leak-free installation directly onto the system's service port. Automatic Reset Logic: Eliminates manual resets by automatically closing the circuit once the system pressure rises back to 60 PSI. High Versatility: Engineered to handle voltages from 24V to 240V, making it compatible with a wide range of residential and commercial equipment. Industrial Durability: The hermetically sealed sensor is factory-calibrated and tamper-proof, ensuring the 35/60 PSI delta remains accurate over the life of the component. Common Questions: Is the MARS 43349 compatible with R410A? Yes, this switch is rated for use with both traditional refrigerants like R22 and high-pressure refrigerants like R410A within its specified 35 PSI to 60 PSI range. How do I wire this into the control circuit? The MARS 43349 uses 18-inch leads to integrate into the 24V or line-voltage safety loop. As an SPST normally open switch, it breaks the circuit on pressure drop (35 PSI) and resets on rise (60 PSI). Does this switch require a separate schrader valve tool? No, the 1/4" female flare fitting includes a built-in deflator, allowing it to actuate the system's schrader core automatically during installation. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
