Mars 12866 Dual Run Capacitor 70/7.5 Mfd 440V

Product Description

The MARS 12866 is a dual-run round capacitor rated at 70/7.5 microfarads (MFD) and 440 volts, designed for use in residential and light commercial HVAC systems. Round capacitors combine two capacitance values in a single cylindrical housing, reducing parts count and simplifying replacement in the field. The 12866 provides starting and running support for both the compressor and the condenser fan motor simultaneously. Licensed HVAC technicians install this part during routine capacitor replacement or as part of a compressor or fan motor service call.

This capacitor is suited for split-system air conditioners, heat pumps, and package units that require a dual-run capacitor in a round form factor. The 70 MFD section supports the compressor, while the 7.5 MFD section supports the condenser fan motor. The 440-volt rating allows it to be used in systems originally specifying either 370-volt or 440-volt dual-run capacitors, providing broader service flexibility across a range of equipment ages and brands.

Key Features

• Dual-run round form factor combines compressor and fan motor capacitance in one unit
• 70/7.5 MFD rating supports compressor and condenser fan motor simultaneously
• 440-volt rating is compatible with both 370-volt and 440-volt OEM applications
• 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, heat pumps, and package units requiring a 70/7.5 MFD 440-volt round capacitor.

Installation Notes

Capacitor replacement is performed by licensed HVAC technicians. Always disconnect and lock out power to the unit before handling capacitors, as they retain a lethal charge even after the system is de-energized. Discharge the capacitor using an appropriate bleed resistor before removing it from the circuit. Follow NEC guidelines and local codes for electrical service work on HVAC equipment.