MARS 12874 Run Capacitor

Engineered for high-performance HVACR duty, the MARS 12874 Run Capacitor is a 45/5 Microfarad dual-section component designed to optimize the efficiency of both fan motors and compressors. Built to meet stringent OEM specifications, this 370Vac oval dual run capacitor utilizes 4-spade quick-connect terminals for seamless field integration. The high-grade metallized polypropylene film construction provides a robust dielectric strength that outperforms standard aftermarket alternatives, ensuring stable capacitance under varying thermal loads. This HVAC dual run capacitor is hermetically sealed in a durable aluminum case to prevent moisture ingress and internal corrosion, a critical factor for long-term reliability in high-cycle residential and commercial condenser units.

Key Benefits:

• Dual capacitance design (45 + 5 MFD) supports simultaneous operation of the compressor and condenser fan motor.
• Rated for 370 Volts AC with a tolerance of +/- 5% for precise motor torque management.
• Oval dual run capacitor form factor allows for universal fitment in standard mounting brackets.
• Complies with EIA 456A standards, simulating 60,000 hours of field operation.
• Non-PCB oil-filled construction facilitates superior heat dissipation in demanding environments.

Common Questions:

Can I use a 440V capacitor to replace this 370V model?
Yes, technicians can safely use a higher voltage rating (440V) as a replacement for 370V applications, provided the MFD ratings (45/5) and physically oval shape match the original mounting specs.

What causes a 45/5 MFD dual capacitor to fail prematurely?
Most failures are due to excessive heat exposure, over-voltage spikes, or age. A bulging top or a drop in microfarad readings during your PM check indicates the internal pressure interrupter has likely been activated.

Is the MARS 12874 compatible with all HVAC brands?
This is a universal part compatible with any brand (e.g., Goodman, Carrier, Rheem) as long as the circuit requires a 45/5 MFD rating at 370V or 440V.

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.