Rectorseal M12045 Oval Run Capacitor 40 Mfd 440V

Product Description

The RECTORSEAL M12045 is a 40 microfarad (MFD), 440-volt oval run capacitor designed for single-phase AC motors in residential and light commercial HVAC systems. Run capacitors maintain a continuous phase shift in the motor winding circuit, improving motor efficiency and keeping the compressor or fan motor running smoothly after startup. This unit is rated at 40 MFD and 440 volts, making it suitable for higher-voltage motor applications where a reliable capacitance value is critical. Licensed HVAC technicians install and replace run capacitors as part of routine seasonal maintenance and no-cool diagnostics.

Oval run capacitors are commonly used in condensing units, air handlers, and heat pumps where cabinet space is limited and oval-profile cans fit mounting brackets more easily than round alternatives. This capacitor is appropriate for condenser fan motors and compressor run circuits in split-system and packaged HVAC equipment. Its compact oval housing measures approximately 1.806 inches wide by 2.806 inches long by 5.25 inches tall, fitting standard bracket-mount configurations found in many residential condensing units.

Key Features

• 40 MFD capacitance rating for single-phase motor run circuits
• 440-volt rating supports higher-voltage motor applications and provides headroom on standard 240-volt systems
• Oval case profile fits space-constrained mounting brackets in condensing unit cabinets
• Compact dimensions: 1.806 inches wide, 2.806 inches long, 5.25 inches tall
• Drop-in replacement form factor for standard oval capacitor brackets

Compatibility

Designed as an OEM-style replacement oval run capacitor for single-phase compressor and condenser fan motor circuits in residential and light commercial HVAC equipment requiring a 40 MFD, 440-volt rating.

Installation Notes

Run capacitor replacement is performed by licensed HVAC technicians. Always disconnect and lock out power to the unit before handling any capacitor — stored charge can cause serious injury even after power is removed, so discharge the capacitor fully using an approved discharge tool or resistor before touching terminals. Verify that the replacement MFD rating and voltage rating match the motor nameplate or OEM specification before installation. Follow all applicable local electrical codes and manufacturer wiring diagrams when reconnecting terminals.

Technical Specifications

• Capacitance: 40 MFD
• Voltage Rating: 440 volts
• Case Style: Oval
• Width: 1.806 inches
• Length: 2.806 inches
• Height: 5.25 inches
• UPC: 685744120452

Standard Information

• Brand: RECTORSEAL
• Manufacturer Part Number: M12045