MARS 12721 Run Capacitor

The MARS 12721 Run Capacitor is a standard-setting solution for local contractors and technicians needing a reliable 40 MFD 370V round capacitor for motor-run applications. Built as a heavy-duty single-value run capacitor, this unit is engineered to maintain consistent phase shift and capacitance, which is critical for the thermal protection and operational efficiency of condenser fan motors and compressor motors. Designed for 370Vac systems, it provides the necessary voltage overhead to manage back-EMF in standard residential and commercial HVAC units. The round metal case configuration ensures a seamless fit in existing mounting brackets, while the non-PCB, oil-filled interior facilitates superior heat dissipation during continuous duty cycles. This HVAC motor run capacitor is a direct replacement for many OEM parts, meeting rigorous industry safety standards for pressure-sensitive interruption. Whether conducting a seasonal tune-up or an emergency repair, the MARS 12721 ensures the system draws optimal amperage while reducing the risk of motor winding burnout.

• 40 Microfarad Rating: Delivers precise capacitance for improved motor torque and reduced energy consumption.
• 370Vac Compatibility: Rated for high-voltage stability in permanent split capacitor (PSC) motor circuits.
• Rugged Round Design: Features a durable metal housing that withstands high-temperature electrical compartments.
• Standardized Terminals: Equipped with 1/4-inch quick-connect terminals for fast, secure wiring in the field.
• Broad Cross-Reference: Serves as a versatile replacement capacitor for numerous MARS2 and Jard legacy part numbers.

Can I use a 440V capacitor to replace this 370V model?
Yes, technicians often use 440V capacitors as an upgrade; however, never use a capacitor with a lower voltage rating than the original 370Vac specification.

Will this work for my dual-run application?
The MARS 12721 is a single-value capacitor. If your unit requires a dual-run capacitor (e.g., 40/5 MFD), you must use the appropriate dual-value component or wire this in tandem with a separate fan capacitor.

How do I know if my current capacitor has failed?
Common indicators include a bulged or "mushroomed" top, leakage of internal fluid, or an out-of-tolerance microfarad reading when tested with a multimeter.

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.