Mars Dual Run Capacitor, Round Air Conditioning Replacement Part, 40/5 MFD 440 Volt

Commercial-Grade Reliability – Mars JARD 45/5 MFD Dual Run Capacitor for Demanding HVAC Applications

The Mars JARD 12788 Dual Run Capacitor is designed for split-phase motor systems requiring reliable support for both compressor and fan circuits. Its dual 45/5 microfarad capacitance and 440/370 VAC rating make it well-suited for residential and light commercial HVAC units. This round capacitor supports system stability under high-load conditions and extended operating cycles, delivering consistent electrical performance in both new installations and replacement scenarios.

Built with a metallized polypropylene film in an aluminum canister, this capacitor offers dependable operation across a wide temperature range. Its compact cylindrical footprint supports seamless integration into standard condensing units and air handler enclosures without the need for enclosure modification.

Designed for Field Use

Constructed to support the mechanical and thermal stress of routine service environments, the 12788 model from Mars ensures operational continuity across varying voltages. It’s a standard replacement option for systems requiring dual capacitance functionality, offering professionals the flexibility to reduce part inventory while maintaining system compatibility.

• ✅ Combined Motor Support – Supports both compressor and fan motor from a single unit, reducing component count and wiring complexity.
• ✅ 440/370 VAC Rating – Rated for systems operating under variable load and voltage fluctuations.
• ✅ Mechanical Durability – Housed in a rust-resistant aluminum shell with insulated terminals to minimize arc risk and improve safety.
• ✅ Field-Ready Format – Compact round design enables rapid fitment in existing brackets and mounting clamps.

Technical Specifications

• Capacitance: 45/5 µF ±6%
• Voltage Rating: 440/370 VAC
• Configuration: Dual Run, Round Profile
• Dielectric: Metallized Polypropylene
• Terminals: Standard ¼-inch quick-connect spade
• Application: HVAC condenser and fan motor support

Installation Considerations

This unit is intended for installation by qualified HVAC professionals. It supports standard ¼-inch terminal connections and requires proper discharge handling to avoid electrical hazard. The dual-run configuration simplifies installation on systems utilizing both compressor and fan capacitors, reducing the need for multiple discrete components. Always verify microfarad and voltage ratings prior to substitution.

Contractor Advantages

Professionals value the Mars JARD 12788 for its blend of reliability and compatibility across common HVAC platforms. The single-canister dual-capacitance design reduces install time, and its robust housing ensures service longevity even in exposed outdoor condensing units. It meets or exceeds performance specifications required by most OEM systems.

Performance Attributes

• ✅ Dual Capacitance Output – Consolidates compressor and fan motor operation in a single package.
• ✅ Universal System Compatibility – Rated for 370/440 VAC to cover a wide range of system designs.
• ✅ Precision Microfarad Tolerance – Helps maintain motor torque and efficiency within design parameters.
• ✅ HVAC-Rated Design – Tested to withstand thermal cycling and environmental exposure common in field conditions.