MARS 19002 Potential Relay

The MARS 19002 Potential Relay, also known as the MARS 63, is a heavy-duty, non-positional solution engineered for HVAC compressor motor starting applications. As a direct 90-63 potential relay replacement, this component is essential for service technicians managing high-torque starting requirements in air conditioning and refrigeration systems. It features a 170V continuous coil voltage with a precise pick-up voltage range of 139V to 153V and a drop-out voltage of 55V, ensuring reliable contactor cycling and motor protection. The inclusion of a universal break-off bracket and screw-type terminals—convertible via the provided QC-6 kit—allows for seamless integration into various physical footprints, replacing thousands of OEM configurations.

Key Benefits:

• Universal non-positional mounting allows for installation in any orientation without affecting calibration.
• Broad cross-reference compatibility replaces industry-standard parts including Steveco 94-63 and various GE 3ARR3 groups.
• A2L refrigerant compliance ensures this relay meets modern safety standards for newer cooling systems.
• High-capacity 35-amp contact rating at 277 VAC provides the durability needed for demanding industrial environments.
• Comprehensive service kit includes a universal break-off bracket, mounting hardware, and spade adapters for fast field adaptation.

Common Questions:

How do I determine the correct pick-up and drop-out voltage for a replacement?
To select the correct potential relay, match the continuous coil voltage and the specific pick-up/drop-out range shown on the original part or motor performance curve. The MARS 19002 is calibrated for systems requiring a 170V hold and a max 153V pick-up.

Can I use the MARS 19002 to replace a Steveco 90-63 relay?
Yes, the 19002 is the definitive 90-63 relay cross reference and is designed to replace that specific series across most residential and light commercial compressor brands.

What is the purpose of the QC-6 kit included with this relay?
The QC-6 kit allows a technician to convert the standard screw-on terminals into push-on (spade) connectors, providing flexibility for different HVAC wiring harnesses found in the field.

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.