MARS 12899 Run Capacitor

The MARS 12899 Run Capacitor is a 80 MFD 370V Round Run Capacitor designed for continuous duty in HVACR motor applications. Engineered for reliability, this 80 microfarad 370Vac component provides the necessary phase-shifted electrical power to stabilize current and torque during standard operation. Its robust aluminum construction and metallized film dielectric ensure optimal heat dissipation and a long operational life in demanding environments, commonly used in residential and commercial condensers and air handlers.

For technicians in the field, this physical interrupter series meets rigorous industry standards for safety and efficiency. The round run capacitor form factor is standard for many motor compartments, offering a 2-inch diameter for clean installation. When replacing an existing unit, ensuring the 80 uF rating matches the motor nameplate is critical for preventing winding overheating. This model is a direct replacement for various OEM parts, including JARD and ClimaTek equivalents, and is rated for 50/60 Hz systems.

• 80 MFD capacitance ensures correct phase angle for peak motor efficiency and torque.
• Built for 370V single capacitance applications with a wide operating temperature range of -40°C to +70°C.
• Non-PCB, oil-filled design with a self-healing metallized film for enhanced durability.
• Equipped with ¼-inch quick-connect terminals for fast, secure wiring by contractors.
• UL recognized and designed for up to 60,000 hours of operational life.

Can I use a 440V capacitor to replace this 370V model?
Yes, you can substitute a higher voltage rating (like 440V) as long as the 80 MFD capacitance remains the same. Never use a capacitor with a lower voltage rating than the original equipment specifies.

What are the signs of a failing run capacitor?
Common indicators include a bulging or "domed" top, leaking dielectric fluid, or symptoms such as motor humming, hard starting, or increased amperage draw on the circuit.

Does it matter which terminal I use for the wires?
Standard run capacitors like the MARS 12899 feature terminals that are internally connected. As long as you maintain the correct wiring configuration from your common and start/run leads, any prong on the same terminal group will work.

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.