The MARS 43306 Pressure Switch is a professional-grade fan cycling control engineered for precise head pressure management in air conditioning and refrigeration systems. This SPST (Single Pole Single Throw) internal automatic reset switch is designed to open on pressure fall at 210 PSI and close on pressure rise at 275 PSI, making it a critical component for maintaining optimal performance in low ambient conditions. Built with a hermetically sealed sensor and tamper-proof construction, this switch ensures long-term reliability and protection against environmental contaminants. Its lightweight design allows for direct mounting via a 1/4 inch female flare SAE connection with an integrated deflator, simplifying installation for technicians in the field. Rated for 6 amps at 24V to 240V, the 43306 is compatible with a wide range of residential and commercial condenser fan motors, providing a dependable solution for high pressure switch applications and system stability. Key Benefits Optimized Head Pressure: Automatically cycles condenser fans to maintain safe operating pressures during low ambient temperatures. Easy Installation: Features 18-inch wire leads with 1/2-inch stripped ends and a standard 1/4" SAE female flare fitting for quick field replacement. Rugged Durability: The hermetically sealed design prevents moisture and debris from fouling contacts, ensuring a long operational life. Universal Compatibility: Operates across a wide voltage range (24V-240V), making it a versatile Mars 43306 HVAC part for various service calls. Common Questions What are the specific trip points for the MARS 43306? This switch is factory-set to open at 210 PSI (Cut-out) on a pressure drop and close at 275 PSI (Cut-in) on a pressure rise. Can this switch be used for high-pressure safety cut-out? While it is primarily used as a fan cycling pressure switch, its SPST open on fall logic and 210/275 PSI ratings must be matched precisely to the system's safety requirements and refrigerant type. Does this part require a special mounting bracket? No, the MARS 43306 is designed for direct mounting onto the system's refrigeration tubing, reducing vibration stress and saving space in tight cabinets. 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.
