MARS 43335 Pressure Switch

The MARS 43335 Pressure Switch is a high-performance, fixed-setting control engineered for demanding HVACR applications, particularly those utilizing R410A refrigerant. This high pressure cut-out switch features a SPST (Single Pole Single Throw) normally closed contact configuration, calibrated to "open on rise" at 600 PSI cut-out and automatically reset (cut-in) at 475 PSI. Built with a tamper-proof, hermetically sealed sensor, the 43335 ensures long-term reliability in both residential and commercial air conditioning systems. The 1/4" female flare S.A.E. mounting with an integrated pressure port depressor allows for direct, leak-free installation on system tubing without the need for additional capillary lines. Rated for 6 amps at 24-240 VAC, this HVAC fan cycling switch incorporates 18-inch leads with stripped ends for seamless integration into existing control circuits. Its UL and CSA recognized construction makes it a standard choice for technicians seeking a high pressure reset switch that maintains tight tolerances of ±15 PSI under heavy cycling 100,000 cycle loads.

Key Benefits for Technicians:

• Optimized for R410A: High-pressure threshold specifically calibrated for modern high-pressure refrigerants and AC pressure switch replacement needs.
• Direct Tubing Mount: Internal depressor pin and 1/4" SAE flare connection eliminate the vibration-prone capillary tubes common in older HVAC pressure controls.
• Industrial Durability: Hermetically sealed sensor and tamper-proof housing protect internal components from moisture, dust, and environmental contamination.
• Broad Compatibility: Electrical rating of 6 amps at 24V to 240V provides flexibility for various control voltages found in HVACR equipment.

Common Questions:

This switch is a standard 1/4" flare high-pressure control. If your system requires a 600 PSI cut-out and 475 PSI cut-in for high-pressure protection or fan cycling, this unit is the industry-standard replacement. Always verify your specific pressure requirements against the 475CI/600CO rating.

No, the MARS 43335 is an automatic reset switch. It will open the circuit when the pressure reaches 600 PSI and will automatically close the circuit once the system pressure drops back down to 475 PSI.

The switch features 18-inch leads and is non-polarized. In a standard high-pressure safety circuit, it is typically wired in series with the compressor contactor coil to break the 24V or 240V control circuit when excessive pressure is detected.

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.