MARS 12929 Run Capacitor

The MARS 12929 Run Capacitor is a standard-service, single-section 5 Microfarad 440Vac Oval Run Capacitor designed for continuous duty in HVACR motor circuits. Engineered with a durable aluminum case, this 5 mfd 440v oval capacitor provides the necessary phase shift to optimize motor torque and efficiency in condenser fans and small blower motors. It is rated for 440VAC but remains fully backwards compatible with 370VAC systems, offering professional technicians a reliable solution for voltage fluctuation protection. Internally protected to 10,000 AFC, this non-PCB, oil-filled component operates efficiently across a wide temperature range of -40°C to +70°C. For contractors looking for a replacement motor capacitor, the 12929 features standard 1/4-inch quick-connect terminals for seamless integration into existing wiring harnesses. Physical dimensions are approximately 2.06 inches in width and 1.21 inches in depth, making it an ideal HVAC run capacitor for tight electrical cabinets where space is at a premium.

• Universal Voltage Application: Rated for both 370V and 440V applications, reducing the need to stock multiple SKUs on the service truck.
• High Tolerance Reliability: Built with a +/- 6% capacitance tolerance to ensure the motor operates within manufacturer-specified amperage ranges.
• Advanced Safety: UL-recognized and internally protected with a 10,000 AFC safety pressure interrupter.
• Environmental Resilience: Encased in a rust-resistant aluminum housing designed for longevity in high-ambient condensing units.

Can I use a 440V capacitor if the original was 370V?
Yes. You can always increase the voltage rating when replacing a capacitor, as the rating indicates the maximum voltage the component can handle. It is critical, however, never to use a lower voltage rating than the original.

Does the orientation of an oval capacitor matter during installation?
While the electrical performance is not affected by orientation, the physical bracket must securely hold the capacitor to prevent vibration-induced lead failure. This oval form factor is specifically designed for narrow mounting straps.

Why is my fan motor pulling high amps with a new capacitor?
If the microfarad (MFD) rating does not match the motor nameplate exactly, the start winding will see incorrect current levels. Always verify that 5 MFD is the specific requirement for your motor before concluding the installation.

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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.