MARS 12927 Run Capacitor

The MARS 12927 is a trade-grade 3 MFD 440V oval run capacitor engineered for continuous duty in high-demand HVACR systems. Designed to stabilize current to single-phase motors, this JARD series motor run capacitor features a metallized polypropylene dielectric housed in a rugged, oil-free aluminum oval case. This low-capacitance component is a standard replacement for fractional-horsepower blower motors, fans, and small-scale induction units where precise 3 microfarad support is essential. Rated for 50/60 Hz and dual 370/440 VAC applications, it offers superior heat dissipation within an operating temperature range of -40°C to +70°C. The internal pressure interrupter ensures safety under fault conditions, following EIA-456-A industry standards. Tech-friendly features include four 1/4-inch male quick-connect spade terminals, allowing for wiring flexibility in compact OEM brackets or restricted air handler cabinets. This non-PCB, UL-listed component ensures high-efficiency performance and motor longevity for professional service calls and preventative maintenance.

Key Benefits:

• Universal Voltage Compatibility: Rated for 440 VAC, making it a safe, high-performance upgrade for 370 VAC applications.
• Construction: Oil-filled, non-PCB design with a corrosion-resistant aluminum shell.
• Enhanced Safety: Built-in physical interrupter prevents case rupture during electrical or mechanical failure.
• Installation Flexibility: Standard oval run capacitor geometry fits tight spaces where round models cannot.
• Reliable Performance: Engineered for 60,000 hours of operational life at rated temperature.

Common Questions:

Can I use this 440V capacitor to replace a 370V model?
Yes. You can always use a higher voltage rating than the original equipment, as it provides more "headroom" for voltage spikes. You must never go lower than the original rating.

What is the difference between MFD and µF?
In the HVACR industry, MFD and µF are used interchangeably to represent microfarads. The MARS 12927 is specifically rated for 3 microfarads.

How do I know if this capacitor is failing?
Common signs include a bulging top, visible oil leaks, or a motor that hums but fails to reach full RPM. Use a multimeter to verify the microfarad reading remains within the ±6% tolerance.

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.