Run Start Capacitor, Round, 55/5 MFD, 440/370

HVAC-Grade Performance – Jard 55/5 µF Dual Run Capacitor, 440/370V

The Mars 12792 Jard Dual Run Capacitor provides dependable support for both compressor and fan motor circuits in single-phase HVAC systems. With a capacitance of 55/5 microfarads and a dual voltage rating of 440/370 VAC, this component delivers consistent reactive power and system stability across a range of air conditioning platforms.

This round run capacitor integrates two capacitance values into a single cylindrical enclosure, streamlining installation and reducing space requirements in the condenser or air handler control compartment. The 12792 is manufactured for use in continuous-duty environments where reliable motor start and run cycles are essential.

Built for Demanding Applications

Constructed with metallized polypropylene film and housed in a sealed, oil-free aluminum can, the Jard 12792 is engineered to perform in high-vibration and extreme-temperature conditions. Its non-PCB design enhances safety and environmental compliance. The standard round profile supports direct-fit replacement in most OEM capacitor mounts.

• ✅ Dual Functionality – Consolidates compressor and fan motor capacitance into one component for simplified wiring and maintenance.
• ✅ 370/440 VAC Rating – Compatible with both standard and high-voltage system configurations.
• ✅ Temperature Tolerance – Operates from -40°C to +70°C, suitable for rooftop and outdoor units.
• ✅ Hermetically Sealed Case – Aluminum enclosure protects against moisture and environmental degradation.

Technical Specifications

• Model: Mars 12792
• Capacitance: 55/5 µF ±6%
• Voltage Rating: 370/440 VAC
• Frequency: 50/60 Hz
• Form Factor: Round Dual Run Capacitor
• Terminals: ¼-inch quick-connect spades
• Dielectric: Metallized polypropylene

Installation Guidance

This capacitor is intended for installation by qualified HVAC personnel familiar with safe discharge practices and system diagnostics. Always verify that the capacitance and voltage match the unit’s specifications. The capacitor should be discharged properly prior to removal and installed using standard service tools to ensure terminal integrity and mounting stability.

Application and Service Benefits

The 12792 is frequently used by HVAC contractors for maintenance of residential and light commercial systems where dual-run capacitors are required. It provides electrical stability during startup and sustained operation, contributing to extended motor life and improved system efficiency. The compact round design minimizes space conflicts in control panels and facilitates faster turnaround on job sites.

Performance Highlights

• ✅ Supports Dual-Motor Loads – Designed for systems where both compressor and fan require capacitive support.
• ✅ Standard Dimensions – Drop-in compatible with most OEM brackets and clamps.
• ✅ Electrical Consistency – Maintains capacitance under thermal and mechanical stress.
• ✅ Service-Ready Durability – Resists corrosion and vibration in demanding field conditions.