MARS 43341 Pressure Switch

The MARS 43341 Low Pressure Switch is a high-reliability, automatic reset control designed to safeguard compressors in commercial and residential HVAC/R systems. Engineered with a tamper-proof construction, this SPST close-on-rise switch features a factory-set 5 PSI cut-out (open) and a 20 PSI cut-in (close) for precise low-ambient protection and fan cycling control. This MARS 70 series equivalent is built for direct tubing mounting via a 1/4 inch SAE female flare connection with an internal deflator, eliminating the need for additional capillary tubes and reducing leak potential.

Rated for 6 Amps at 24-240V, the 43341 pressure control is fully compatible with modern refrigerants including R-410A and R-22. The 18-inch color-coded wire leads with 1/2-inch stripped ends allow for rapid integration into existing control circuits. Whether used as a loss of charge protector or a fan cycling switch, this Klixon-style pressure control ensures consistent performance up to 100,000 cycles, providing the durability expected by veteran contractors in the field.

• Direct Mounting: The 1/4" female flare connection allows for easy installation directly on the system's access port.
• Automatic Reset: The internal SPST-NO mechanism automatically restores circuit continuity once pressure rises above 20 PSI.
• Robust Electrical Rating: Pilot duty rated pilots up to 6.0 FLA at 120/240V for broad system compatibility.
• Environmental Resilience: Features 18" blue XLP wire leads designed to withstand high-temperature environments.

What does N/O A/R 20CI 5CO mean in this context?
This identifies a Normally Open switch with Automatic Reset functionality. The "20CI" refers to a 20 PSI Cut-In (close), while "5CO" indicates a 5 PSI Cut-Out (open).

Can the MARS 43341 be used for high-pressure applications?
No. This is specifically a low-pressure cut-out switch. For high-pressure protection or condenser fan cycling at higher setpoints, a high-pressure rated control must be used.

Is this switch compatible with R-410A systems?
Yes, the MARS 43341 is designed to handle the pressures and oils associated with R410A, though it is primarily used on the low-side of the circuit.

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.