Mars 12786 Round Capacitor 40/5 Mfd 440 Volt

Product Description

The MARS 12786 is a dual run capacitor rated at 40/5 microfarads (MFD) and 440 volts, built in a round form factor for use in residential and light commercial HVAC systems. Dual run capacitors serve two motor windings simultaneously, providing starting and running support to both the compressor and the condenser fan motor from a single unit. This design reduces cabinet space requirements and simplifies replacement work. Licensed HVAC technicians install this part during routine maintenance, capacitor failure diagnosis, or as a direct replacement when the original unit has drifted out of tolerance or failed open.

The MARS 12786 is suited for split-system air conditioners and heat pumps where a single dual run capacitor supports both the compressor and outdoor fan motor. It fits into standard round capacitor mounting brackets found in most outdoor condensing units. The 440-volt rating accommodates both 208-volt and 240-volt single-phase residential applications, giving technicians flexibility across common residential equipment voltage ranges. Always verify the MFD ratings and voltage rating against the original equipment nameplate before installation.

Key Features

• Dual capacitance rating of 40/5 MFD supports compressor and condenser fan motor from a single component
• 440-volt rating compatible with 208-volt and 240-volt single-phase systems
• Round form factor fits standard round capacitor mounting hardware in outdoor condensing units
• Single-unit replacement simplifies service calls and reduces parts inventory on the truck

Compatibility

Designed as an OEM-style replacement dual run capacitor for residential and light commercial split-system air conditioners and heat pumps requiring a 40/5 MFD, 440-volt round capacitor. Confirm MFD ratings and voltage rating against the equipment nameplate before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician. Always disconnect and lock out power to the condensing unit before handling capacitors, and discharge the capacitor using an appropriate resistive discharge tool before touching any terminals, as capacitors retain a charge after power is removed. Verify the replacement MFD ratings and voltage rating match the original unit nameplate specifications exactly. Follow all applicable local electrical codes and manufacturer service instructions during installation.