Mars 12223 Round Run Capacitor 45 Mfd 370V

Product Description

The MARS 12223 is a round run capacitor rated at 45 microfarads (MFD) and 370 volts, designed to support single-phase PSC motors in residential and light commercial HVAC equipment. Run capacitors maintain a continuous phase shift to keep compressor and fan motors operating efficiently under load. The 12223 uses a compact round case that fits standard capacitor brackets and disconnect pulls. HVAC technicians replace run capacitors as a routine service repair when a motor exhibits hard-start symptoms, fails to start, or draws elevated amperage due to capacitor degradation.

This capacitor is suited for single-phase compressor motors, condenser fan motors, and air handler blower motors operating on 370-volt circuits. It is a common replacement part in residential split systems and package units where 45 MFD run capacitors are called out on the unit nameplate. The round form factor fits most standard capacitor mounting brackets found in condensing units and air handlers.

Key Features

• 45 MFD capacitance rating for consistent motor run support
• 370-volt AC rating suitable for standard residential HVAC circuits
• Round case design fits standard capacitor brackets and pull-out disconnects
• Supports PSC compressor motors, condenser fan motors, and blower motors
• Direct replacement form factor for 45 MFD 370V round run capacitors

Compatibility

Designed as an OEM-style replacement for single-phase PSC motors in residential and light commercial HVAC equipment requiring a 45 MFD 370-volt round run capacitor. Always verify the MFD rating and voltage rating on the unit nameplate before installation.

Installation Notes

Capacitor replacement is performed by licensed HVAC technicians. Disconnect and lock out all power to the unit before handling any capacitor — capacitors store a lethal electrical charge and must be safely discharged before removal. Use an insulated discharge tool or resistor across the terminals prior to disconnecting leads. Verify that the replacement capacitor MFD rating and voltage rating match the values printed on the equipment nameplate.

Technical Specifications

• Capacitance: 45 MFD
• Voltage Rating: 370 volts
• Case Style: Round
• UPC: 68574412223

Standard Information

• Brand: MARS
• Manufacturer Part Number: 12223