Single Run Capacitor, Round, 20/440 uF

Contractor-Grade Reliability – Mars 12737 Round Motor Run Capacitor, 20 MFD, 440V

The Mars 12737 round run capacitor is designed to meet the operational demands of HVAC motors requiring a 20 microfarad capacitance at 440 VAC. Manufactured under the Jard brand by Mars, this component is built for continuous-duty performance in fan, blower, and compressor motor circuits. Its compact cylindrical profile supports installation in constrained locations without sacrificing accessibility or reliability.

This model is engineered for use in 50/60 Hz systems and includes a non-PCB dielectric fluid with an integrated pressure-sensitive interrupter, offering both functional performance and protection under fault conditions. Its terminal configuration allows for four quick-connect tabs, ensuring compatibility with standard mounting and wiring setups in field applications.

Component Advantages

• ✅ 20 Microfarads ±6% – Precision-rated for optimal phase angle control in permanent split capacitor (PSC) motor circuits.
• ✅ Rated for 440 VAC – Suitable for continuous operation in residential and light commercial air conditioning equipment.
• ✅ Metallized Polypropylene Film – Ensures long-term dielectric stability and self-healing characteristics.
• ✅ Thermal Performance – Operates from -40°C to +70°C ambient; designed to meet EIA-456-A performance standards.

Technical Specifications

• Capacitance: 20 µF ±6%
• Voltage: 440 VAC
• Frequency: 50/60 Hz
• Operating Temperature: -40°C to +70°C
• Dimensions: 3-1/8" height × 3/4" diameter (approximate)
• Terminals: 4 male quick-connect tabs
• Shape: Round

Installation Notes

This capacitor is intended for installation by qualified HVAC personnel. Ensure the system is de-energized before replacing components. Verify terminal configuration and capacitance values against OEM requirements. Use a properly rated multimeter for validation prior to energizing the unit. Always observe manufacturer torque specifications for terminal connections and mounting bracket installation.

Key Use Cases for Contractors

• ✅ Replacement and Retrofit – Suitable for OEM system repairs or upgrades where 20 MFD, 440V capacitors are specified.
• ✅ Fleet Standardization – Compatible with a wide range of common fan and blower motors, supporting simplified parts inventory.
• ✅ Job Site Durability – Constructed to handle mechanical stress and variable temperature conditions during operation and transport.

Summary

The Mars 12737 capacitor offers performance consistency and robust construction suitable for high-demand HVAC environments. With precision capacitance, broad operating temperature range, and UL-recognized safety features, this unit provides reliable power factor correction and voltage phase stabilization for single-phase motors. A practical solution for system maintenance or emergency repair tasks, it delivers both value and longevity where it matters most—on the job site.