MARS 12878 Run Capacitor

The MARS 12878 Run Capacitor is a professional-grade 40/5 MFD 370V dual run capacitor designed for high-demand HVACR applications. Engineered as a direct HC98JA041 replacement, this round dual run capacitor manages both the compressor and the condenser fan motor, ensuring consistent torque and phase shift. Constructed with a heavy-duty aluminum housing, it features a 60,000-hour operational life and maintains performance within a broad temperature range of -40°C to +70°C. This non-PCB, oil-filled component utilizes 1/4-inch quick-connect terminals (4, 3, 2 configuration) for efficient field installation. Whether you are servicing a residential air conditioner or a light commercial heat pump, the MARS 12878 provides the necessary dielectric strength and thermal stability to prevent motor overheating and reduce electrical consumption in 50/60 Hz systems.

• Dual-Purpose Power: Simplifies inventory by supporting both compressor and fan motor circuits in a single 40/5 microfarad capacitor.
• Extended Service Life: Rated for 60,000 hours of operation, reducing the frequency of nuisance service calls and system downtime.
• Universal Compatibility: Serves as a technical equivalent to HC98JA041 and other common 370VAC round capacitors.
• Rugged Construction: Environmentally sealed aluminum casing provides superior heat dissipation and internal pressure protection.

Can I use a 440V capacitor to replace this 370V model?
Yes. While you must never use a capacitor with a lower voltage rating than the original, a 440V capacitor can safely replace a 370V unit as long as the MFD rating and physical dimensions match.

Does this capacitor work for both 50Hz and 60Hz systems?
Yes, the MARS 12878 is engineered to operate efficiently on both 50Hz and 60Hz power supplies, making it versatile for various regional equipment setups.

What are the physical dimensions for mounting clearance?
The unit features a 2-inch diameter with a case height of 2.75 inches and an overall height of 3.25 inches, fitting most standard round capacitor mounting brackets.

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.