MARS 19165 Relay

The MARS 19165 Potential Relay is a high-performance motor starting component engineered for capacitor-start, capacitor-run (CSR) and induction-run (CSIR) systems. Designed with 165 Potential Relay 332v Coil Volt specifications, this non-positional relay effectively manages high-torque requirements while ensuring 332V continuous coil voltage stability. With a robust 35 amp contact rating, the MARS 19165 handles substantial electrical loads, featuring a precise pick-up voltage range of 171-184V and a drop-out voltage of 55-90V. Its tab mount design and 1/4 inch quick connect terminals facilitate rapid integration into standard control panels. As a universal HVAC potential relay, it serves as a reliable replacement for diverse OEM models, maintaining consistent back EMF detection to accurately disengage the start capacitor. This A2L-compliant component utilizes Class B insulation and is UL/CSA listed, making it a critical asset for contractors seeking to optimize compressor efficiency and prevent motor winding damage in residential and light commercial applications.

• Universal Capability: Engineered to replace a vast range of OEM potential relays, reducing truck stock requirements for HVAC contractors.
• High Amperage Durability: Rated for 35 amp contact current at 400-480 VAC, suitable for heavy-duty compressor motor starting.
• Precise Switching: Features a calibrated 171-184V pick-up and 55-90V drop-out cycle to ensure the start capacitor is removed at exactly 75% of motor speed.
• Flexible Installation: The non-positional, tab mount configuration with 1/4 inch quick connect terminals allows for mounting in any orientation within cramped electrical enclosures.
• Safety Standards: UL listed and CSA certified with Class B insulation for reliable operation in high-temperature environments.

What is the primary function of the MARS 19165 in a CSR motor circuit?
It monitors the back EMF across the start winding; once the motor reaches approximately 75% of its rated speed, the relay opens the normally closed contacts between Terminals 1 and 2 to take the start capacitor out of the circuit.

Can this relay be mounted in any orientation?
Yes, the MARS 19165 is a non-positional potential relay, meaning its internal mechanical operation is not affected by gravity, allowing for horizontal, vertical, or inverted mounting.

How do I test the coil on this potential relay?
Using an ohmmeter on a high resistance setting, measure between terminals 2 and 5. A functional coil should typically show a reading between 10kΩ and 12kΩ; an infinite (OL) reading indicates a failed relay coil.

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.