Rectorseal M12078 Dual Run Capacitor 40 Mfd 440V

Product Description

The RECTORSEAL M12078 is a round dual run capacitor rated at 40 microfarads (MFD) and 440 volts, designed for use in residential and light commercial HVAC systems. Run capacitors provide continuous phase-shifted current to motor windings, keeping compressors and fan motors operating at correct torque and efficiency throughout the run cycle. At 2.5 inches in diameter and 3.625 inches in height, this round-style capacitor fits standard capacitor brackets found in most split-system condenser units. HVAC technicians install this part during routine capacitor replacement or compressor and condenser fan motor changeouts.

This capacitor is suited for split-system air conditioners and heat pumps where a single round dual-run capacitor powers both the compressor and the condenser fan motor simultaneously. The 440-volt rating provides a safe voltage margin for standard 240-volt residential systems, and the compact round form factor simplifies installation in confined condenser cabinet spaces. It is a direct-replacement style component commonly stocked on HVAC service vehicles for fast turnaround on capacitor failure calls.

Key Features

• 40 MFD capacitance rating for dual-run compressor and condenser fan motor applications
• 440-volt rating provides operating headroom on standard 240-volt residential systems
• Round form factor fits standard condenser unit capacitor brackets
• Compact footprint: 2.5 inches diameter by 3.625 inches height
• Direct OEM-style replacement for failed run capacitors in split-system equipment

Compatibility

Designed as an OEM-style replacement run capacitor for residential and light commercial split-system air conditioners and heat pumps requiring a 40 MFD, 440-volt round dual-run capacitor.

Installation Notes

Run capacitor replacement is performed by licensed HVAC technicians. Disconnect and lock out all power to the condensing unit before opening the capacitor compartment. Capacitors store a lethal electrical charge even after power is removed — discharge the capacitor through a resistor before handling. Verify the MFD rating, voltage rating, and terminal configuration match the original unit before completing the installation.

Technical Specifications

• Capacitance: 40 MFD
• Voltage Rating: 440 volts
• Form Factor: Round
• Diameter: 2.5 inches
• Height: 3.625 inches
• UPC: 685744120780

Standard Information

• Brand: RECTORSEAL
• Manufacturer Part Number: M12078