Mars 12791 Round Dual Run Capacitor 50/7.5 Mfd 440V

Product Description

The MARS 12791 is a round dual run capacitor rated at 50/7.5 microfarads (MFD) and 440 volts, designed for use in residential and light commercial HVAC systems. Dual run capacitors support both the compressor and the condenser fan motor from a single unit, reducing cabinet space and simplifying replacement. The round form factor is the most common style found in split-system condensing units and package units. HVAC technicians install this capacitor as a direct replacement when servicing systems that exhibit hard-start symptoms, motor run failures, or capacitor bulging and leakage.

This capacitor is suited for split-system air conditioners and heat pumps where a single dual run capacitor serves the compressor and fan motor simultaneously. The 440-volt rating provides compatibility across a wide range of single-phase residential and light commercial condensing units. It is sold as a single unit and is intended for installation by a licensed HVAC technician during routine maintenance or component-level repair of the outdoor condensing unit.

Key Features

• Dual run capacitor supports both compressor and condenser fan motor from one component
• 50/7.5 MFD capacitance rating for correct compressor and fan motor operation
• 440-volt rating accommodates standard single-phase residential and light commercial systems
• Round form factor fits standard capacitor brackets and mounting hardware in most condensing units
• Sold as a single unit for direct one-for-one replacement

Compatibility

Designed as an OEM-style replacement dual run capacitor for residential and light commercial split-system air conditioners and heat pumps requiring a 50/7.5 MFD, 440-volt round capacitor.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out all power to the condensing unit before handling any capacitor, and discharge the existing capacitor fully before removal, as capacitors retain a dangerous charge even after power is off. Verify the MFD and voltage ratings on the original capacitor before installing the replacement. Follow all applicable local electrical codes and NEC guidelines for low-voltage and high-voltage wiring in HVAC equipment.