MARS 12972 Run Capacitor

The MARS 12972 Run Capacitor is a high-spec 35/5 MFD 370V dual run capacitor engineered for multi-motor HVACR configurations. Designed for heavy-duty cycling in residential and commercial condenser units, this oval dual run capacitor provides precise phase shift for both the compressor and the condenser fan motor. As a direct replacement for P291-3553, it ensures seamless field integration without modification. The MARS 12972 features a rugged aluminum housing for superior heat dissipation during high-load operations, maintaining performance in ambient temperatures ranging from -40°C to +70°C. Rated for 50/60 Hz and 370 VAC, this 35+5 uF oval capacitor uses quick-connect 4-terminal arrays to simplify wiring for technicians. With an operational life cycle of up to 60,000 hours, it offers reliable capacitance stability, reducing torque issues and motor overheating in demanding HVAC environments.

• 35/5 MFD Dual Rating: Single-component solution for managing both compressor and fan motor loads.
• 370 VAC Versatility: Suitable for systems requiring 370 volts, providing a high-grade HVAC replacement capacitor.
• Extreme Durability: Aluminum-cased construction rated for up to 60,000 hours of continuous service.
• Space-Saving Oval Design: Fits standard brackets in compact electrical cabinets where round capacitors may not clear.
• Direct Cross-Reference: 12972 replaces P291-3553, ensuring exact electrical and physical compatibility.

Can I use this 370V capacitor in place of a 440V capacitor?
No. You can always use a higher voltage rating than the original (e.g., using a 440V to replace a 370V), but you must never use a lower voltage rating. Ensure the motor nameplate specifies 370V or lower before installing the MARS 12972.

Does this capacitor include a mounting bracket?
The MARS 12972 HVAC dual run capacitor is typically secured using the existing strap or bracket in the unit. Its standard oval dimensions are compatible with most universal mounting hardware found in AC condensers.

How do I identify the terminals?
The unit features clear markings: "C" for the common line, "HERM" for the compressor, and "FAN" for the condenser fan. Correct wiring is essential to prevent motor winding damage.

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.