MARS 19004 Potential Relay

The MARS 19004 is a professional-grade 65 potential relay engineered for heavy-duty single-phase compressor start applications. Rated for a 332 continuous coil voltage, this component is a critical direct replacement relay for problematic 90-3, 90-65, and 3ARR3MARS65 units often found in high-performance HVACR systems. Unlike standard relays, this non-positional potential relay utilizes back-EMF (electromotive force) to precision-disengage the start capacitor once the motor reaches approximately 75% to 80% of its synchronous speed, protecting the start windings from thermal overload and ensuring consistent high starting torque.

Designed for immediate service truck readiness, the MARS 19004 features a universal break-off bracket and includes the QC-6 conversion kit to seamlessly adapt between screw-on and push-on terminal configurations. With a 35-amp contact rating and a dropout voltage threshold of 90V, this relay provides the reliable switching required for A2L refrigerant compliant systems. Its robust construction eliminates armature sticking caused by organic contaminants, making it the industry-standard choice for technicians replacing 3ARR3 series relays in residential or light commercial condensing units.

• Universal Compatibility: Specifically calibrated to replace thousands of O.E.M. models, including General Electric and Packard cross-references.
• Heavy-Duty Switching: Rated for up to 35 Amps, providing a wider safety margin for high-demand compressor start-ups.
• Flexible Mounting: The non-positional design and snap-off bracket allow for installation at any angle in cramped control boxes.
• Terminal Versatility: Direct-fit screw terminals can be converted to push-on tabs using the included hardware for rapid field replacement.

Is the MARS 19004 compatible with hard start kits?
Yes, as a voltage-sensing relay, the 19004 is frequently used as the switching mechanism in 5-2-1 style hard start kits to manage the start capacitor circuit.

What are the pick-up and drop-out voltage specs?
This relay features a pick-up voltage range of 168V to 182V and a drop-out voltage of 90V, ensuring the start circuit is properly isolated once the compressor is up to speed.

Will this replace my 3ARR3MARS65 or 90-65 relay?
Yes, the 19004 is the direct technical successor to those part numbers, matching the required 395V coil voltage and electrical parameters for a safe, reliable swap.

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.