MARS 12714 Run Capacitor

The MARS 12714 is a professional-grade 20 MFD 370 VAC round run capacitor designed for continuous duty in HVACR systems. As a direct replacement for 621500, this component ensures the reliable phase shift required for optimal torque and efficiency in single-phase motors. Utilizing high-grade metallized polypropylene film, the MARS 12714 is engineered to handle the rigorous back EMF generated by condenser fan motors and compressors. Professional technicians select this 370 volt round run capacitor for its strict adherence to EIA-456-A standards, providing a precise 20 microfarad capacitance that maintains motor RPM and prevents premature winding failure. The physical dimensions of approximately 1.75 inches in diameter allow for an easy fit in standard mounting brackets. By replacing a weak or drifted capacitor with this genuine MARS part, you protect the motor from overheating and ensure peak performance across high-ambient installations.

• Direct Cross-Reference: Engineered specifically as a drop-in replacement for 621500 to maintain OEM performance levels.
• High Dielectric Strength: The 370 VAC rating provides ample overhead for standard 208/230V residential and light commercial equipment.
• Internal Safety Features: Includes an integrated pressure-sensitive interrupter designed to disconnect the capacitor safely if internal pressure builds.
• Standardized Terminals: Features industry-standard 1/4-inch quick-connect terminals for fast and secure field wiring.

Can I use a 440V capacitor if the original was 370V?
Yes, you can always go up in voltage (using a 440V to replace a 370V), but you must never go down. The MARS 12714 is rated for 370V, which is the standard for most original equipment fan motors.

What are the signs that my 20 MFD 370 VAC capacitor is failing?
Technicians should look for physical bulging (mushrooming) of the top, oil leakage, or a humming motor that fails to start. Testing with a multimeter in capacitance mode is the only way to confirm a drift outside the ±10% tolerance.

How do I ensure this round run capacitor will fit my unit?
The MARS 12714 features a standard round "can" design. Always verify the diameter and height against your existing mounting strap, though these are typically standardized for 20 MFD ratings.

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.