MARS 12791 Run Capacitor

The MARS 12791 is a professional-grade 50/7.5 microfarad 440Vac round dual run capacitor engineered for high-demand HVACR applications. Designed to support both the compressor (50 µF) and the condenser fan motor (7.5 µF), this Jard dual run capacitor provides stable reactive power and improves motor torque during the run cycle. Built with metallized polypropylene film dielectric and housed in a hermetically sealed, non-PCB aluminum canister, it is rated for continuous operation in ambient temperatures ranging from -40°C to 70°C. This 440V HVAC capacitor is a versatile service part that can safely replace 370V equivalents, offering increased dielectric strength for residential and light commercial condenser motor repair. Featuring standard 1/4-inch quick-connect terminals and a compact round profile, the MARS 12791 ensures seamless integration into existing mounting brackets, reducing downtime during emergency service calls.

Key Benefits:

• Dual Motor Support: Consolidates compressor and fan motor start/run requirements into a single high-performance component.
• Voltage Versatility: The 440Vac rating allows for universal capacitor replacement in both 370V and 440V systems.
• Environmental Resilience: Hermetically sealed aluminum construction ensures internal components are protected from oil, moisture, and debris.
• Service Inventory Efficiency: Standardized round footprint fits the majority of OEM heat pump and air conditioner mounting hardware.

Common Questions:

Can I use a 440V MARS 12791 to replace a 370V capacitor?
Yes. In HVACR applications, you can always increase the voltage rating of a capacitor, as it indicates the maximum electrical stress the dielectric can handle. Never undersize the voltage.

What are the signs of a failing 50/7.5 dual run capacitor?
Common field indicators include a "bulged" or swollen top, low MFD readings during a bench test, or the compressor failing to start while the fan remains operational.

Does orientation matter when installing the MARS 12791?
The round dual run capacitor can be mounted in any orientation; however, ensure the terminals are properly labeled (HERM, FAN, C) and clear of any metal cabinet parts to prevent shorting.

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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.