MARS 43347 Pressure Switch

The MARS 43347 Pressure Switch is a heavy-duty, auto-reset low pressure control engineered for precise refrigerant monitoring in residential and commercial HVACR systems. This SPST normally open pressure switch is factory-set to open at 25 PSI and close at 65 PSI, providing reliable protection against low-side pressure drops that can lead to compressor failure. Specifically designed for compatibility with common refrigerants, including R-410A applications, it features a 1/4" female flare connection with a built-in deflator for direct mounting onto the system tubing. The Klixon 4-series sensor technology ensures a hermetically sealed environment, maintaining a 100,000-cycle life under rated electrical loads. With 18-inch leads and a robust 6A inductive rating at 240V, this HVAC low pressure cutout offers technicians a tamper-proof solution for maintaining system integrity and preventing evaporator freeze-ups. Its compact, lightweight construction allows for seamless installation in tight service panels where space is at a premium.

Key Benefits

• Precision Monitoring: Features a factory-calibrated 25 PSI open and 65 PSI close setpoint for consistent system protection.
• Direct Tubing Mount: Equipped with a 1/4" female flare connection, eliminating the need for additional mounting brackets in most configurations.
• High Durability: Rated for over 100,000 cycles at full load, utilizing a hermetically sealed sensor to resist moisture and debris.
• Broad Compatibility: Supports a wide voltage range from 24V to 240V, making it suitable for various control circuit requirements.
• Simplified Wiring: Includes 18-inch blue XLP lead wires with 1/2" stripped ends for fast integration into existing wire harnesses.

Common Questions

What is the reset type for the MARS 43347?
This model is an auto-reset switch. Once the system pressure rises back to the 65 PSI setpoint, the contacts will automatically close to restore operation.

Can this pressure switch be used with high-pressure refrigerants?
Yes, the MARS 43347 is designed for 4-series applications, including R-410A, and features a burst pressure rating of up to 5,000 PSI for added safety.

Does it include a schrader valve deflator?
The 1/4" female flare fitting includes a physical deflator, allowing the switch to be mounted directly onto a schrader service port without needing to recover the refrigerant charge.

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.