MARS 12759 Run Capacitor

The MARS 12759 Run Capacitor is a heavy-duty 80 MFD 440V round capacitor designed for high-demand HVACR applications. As a veteran-grade motor run capacitor, this unit supports continuous-duty single-phase motors in residential and commercial condensing units, compressors, and high-static blower assemblies. Engineered to replace 80 microfarad capacitors in both 370V and 440V configurations, the Jard 12759 features a non-PCB, oil-filled dielectric fluid within a robust aluminum housing for superior thermal dissipation and pressure-sensitive internal protection. With a tolerance of +/- 6% and rated for 50/60 Hz cycles, this 80 uF round run capacitor ensures stable reactive power and consistent motor torque, even in high-ambient environments. HVAC technicians rely on this part for its universal fit and dual terminals (1/4-inch quick-connect), simplifying service calls and ensuring permanent split capacitor (PSC) motors operate within OEM electrical specifications.

Key Benefits

• Universal 440V/370V Compatibility: Rated for up to 440VAC, this capacitor is a safe and effective replacement for systems requiring 370V or 440V protection.
• Industrial Temperature Range: Built to withstand operating temperatures from -40°C to +70°C, preventing premature failure during peak summer loads.
• Enhanced Safety Design: Features an internal physical interrupter to disconnect the capacitor in the event of an internal failure, protecting the motor and surrounding components.
• High-Torque Support: The 80 MFD capacitance provides the necessary phase shift to maintain efficient motor operation and reduce energy consumption.

Common Questions

Can I use an 80 MFD 440V capacitor to replace an 80 MFD 370V version?
Yes. You can always use a higher voltage rating (440V) to replace a lower one (370V), provided the capacitance (80 MFD) and physical dimensions match the original equipment.

How do I identify a failing run capacitor in a condensing unit?
Standard indicators include a "bulged" or swollen top, leaking dielectric fluid, or a motor that hums but fails to start. Testing with a multimeter should show a reading within 6% of the 80 MFD rating.

Does the shape matter for installation?
Yes. This is a round run capacitor. While the electrical specifications are the primary concern, ensure your mounting bracket is designed for a round canister rather than an oval one to secure the part properly.

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.