Mars 12790 Round Dual Run Capacitor 50/5 Mfd 440V

Product Description

The MARS 12790 is a round dual run capacitor rated at 50/5 microfarads (MFD) and 440 volts, designed for use in single-phase HVAC compressor and fan motor circuits. Dual run capacitors serve two functions in a single housing: they support the compressor motor and the condenser fan motor simultaneously. The 12790 uses a round form factor, which is the most common physical configuration found in residential and light commercial condensing units. HVAC technicians install this part during routine capacitor replacements or as part of a compressor or fan motor service call.

This capacitor is suited for residential and light commercial split-system air conditioners and heat pumps where a single round dual run capacitor handles both the compressor start-and-run and the outdoor fan motor run functions. It is a direct drop-in style replacement for failed or weak capacitors of the same MFD and voltage rating. The 440-volt rating provides compatibility with both 370-volt and 440-volt rated systems, making it a practical field replacement option for HVAC service technicians carrying consolidated van stock.

Key Features

• Dual run capacitor design supports both compressor and condenser fan motor in a single unit
• 50/5 MFD dual capacitance rating for combined compressor and fan motor circuits
• 440-volt rating compatible with 370V and 440V system applications
• Round form factor fits standard capacitor mounting brackets in most condensing units
• Sold as a single unit for one-for-one field replacement

Compatibility

Designed as an OEM-style replacement for residential and light commercial air conditioning and heat pump condensing units requiring a round dual run capacitor rated 50/5 MFD at 440 volts.

Installation Notes

A licensed HVAC technician should perform capacitor replacement. Disconnect and lock out all power to the condensing unit before beginning service, and discharge the existing capacitor using a resistive discharge tool before handling or removing it - capacitors retain a dangerous charge even after power is removed. Verify that the replacement capacitor matches the MFD ratings and voltage rating of the original unit before installation. Follow all applicable local electrical codes and NEC guidelines when servicing capacitor circuits.