MARS 12720 Run Capacitor

The MARS 12720 is a trade-grade 30/3 MFD 370V dual run capacitor engineered for high-duty cycle performance in residential and light commercial HVACR systems. As a veteran-preferred component for field service, this round dual run capacitor provides the necessary phase shift to support both the hermetic compressor and the condenser fan motor from a single, compact housing. Built with a non-PCB, oil-filled design and housed in a durable aluminum casing, the 12720 is specifically designed to meet EIA-456-A industrial standards for 60,000 hours of operating life. For technicians replacing failing units, this capacitor serves as a direct cross-reference for numerous OEM specifications and is rated for operation across a wide temperature range of -40°C to +70°C. Integrating a patented pressure-sensitive interrupter, it ensures safe circuit disconnection at end-of-life. When sourcing a replacement HVAC capacitor, the 12720 offers the reliability required for the 30+3 microfarad 370Vac application standard.

• Dual-Section Design: Consolidates compressor and fan motor support into one 30/3 microfarad unit, simplifying wiring and reducing component footprint in the electrical cabinet.
• Industrial Compliance: Meets UL 810 safety requirements and EIA-456-A standards, ensuring high-performance reliability under continuous load.
• Thermal Resilience: Optimized for exterior condenser environments with a wide operating temperature range from -40°C to 70°C.
• Safety Engineering: Features a physical pressure-sensitive interrupter (PSI) to protect the system during electrical faults or end-of-life failure.
• Quick Installation: Standard 1/4-inch male disconnect terminals allow for fast, secure connections in the field.

Can I use a 440V capacitor to replace this 370V model?
Yes. While you can always use a higher voltage rating (such as a 440Vac capacitor) to replace a 370Vac unit, you must never use a lower voltage rating than the original equipment specifies.

What happens if the capacitance rating (MFD) is off?
It is critical to match the 30/3 uF rating exactly or within the standard +/- 6% tolerance. Incorrect microfarad values can cause the motor windings to overheat, leading to premature motor failure or starting issues.

Why is the capacitor bulging or leaking?
Physical distortion or oil leakage indicates that the internal pressure-sensitive interrupter has likely activated due to excessive heat or a voltage spike. At this point, the HVAC capacitor must be replaced immediately to restore system function.

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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.