MARS 16036 Potential Relay

As a veteran tech, you know that keeping high-torque compressors running efficiently depends on a reliable start circuit. The MARS 16036 Potential Relay, specifically model 3ARR3J3-L3, is the industry-standard solution for capacitor-start capacitor-run (CSR) and capacitor-start induction-run motors. This OEM motor starting relay is a drop-in potential relay replacement for Bristol and Copeland applications, designed to handle the heavy-duty demands of 1/3 HP systems. It operates using back EMF (electromotive force) sensing, ensuring the start capacitor is dropped out of the circuit exactly when the motor reaches optimal speed. With a pick-up voltage range of 132 to 148V and a massive hold voltage of 332V, this component prevents capacitor failure and winding damage. This non-positional relay features a universal tab-type bracket integrated into the plastic cover for fast mounting in the field. When your hard start kit or standard compressor start relay fails, this 35 Amp contact rating relay provides the switching precision required for professional HVACR maintenance.

• Universal Compatibility: Serves as an exact 3ARR3J3-L3 cross reference for thousands of OEM refrigeration and air conditioning models.
• Back EMF Precision: Accurately senses countervoltage to protect start windings and capacitors from burnout.
• Heavy-Duty Construction: Features Class B insulation and a 35 Amp contact rating for long-term electrical stability.
• Contractor-Friendly Install: Non-positional design with quick-connect terminals and a snap-off universal bracket for tight spaces.
• Broad Application: Optimized for use in residential HVAC units, commercial walk-ins, and food service equipment.

How do I test if the MARS 16036 is defective?
Using a multimeter, check for continuity between terminals 1 and 2; they should be normally closed (NC). Then, check the relay coil resistance between terminals 2 and 5. An "OL" or infinite reading indicates a broken coil wire requiring immediate replacement.

Can this relay be used on 1/3 HP compressors?
Yes, this unit is specifically rated for 1/3 HP motors. It provides the necessary starting torque management for single-phase systems found in both residential and light commercial applications.

What is the difference between this and a current relay?
Unlike current relays that rely on high starting amperage, this potential relay uses back-EMF or countervoltage generated by the motor. This makes it more precise for high-torque applications where starting conditions vary.

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.