Run Capacitor, Oval, 4 MFD, 440/370

Jard 4 µF Oval Motor Run Capacitor – 440V, Continuous Duty, Non-PCB

The Mars 12928 Jard Oval Run Capacitor is designed to support single-phase induction motors in continuous-duty HVAC and refrigeration applications. With a capacitance of 4 microfarads and a 440 VAC rating, this capacitor is suitable for use in fan motors, blower assemblies, and other fractional horsepower loads requiring stable voltage support and sustained torque output.

Manufactured with metallized polypropylene film and enclosed in a non-PCB, oil-free aluminum housing, this capacitor meets industry standards for dielectric reliability and safety. Its compact oval configuration allows for efficient placement in space-limited enclosures such as air handlers and condensing units.

Component Highlights

• ✅ Capacitance: 4 µF ±6% tolerance for consistent reactive power delivery.
• ✅ Voltage Rating: 440 VAC – Dual-rated for higher-voltage systems with increased operating demands.
• ✅ Case Material: Oval aluminum with sealed top; corrosion-resistant and mechanically stable.
• ✅ Thermal Range: Designed for operation from -40°C to +70°C in outdoor and indoor HVAC applications.
• ✅ Safety Feature: Built-in pressure interrupter for overload protection in fault conditions.

Technical Specifications

• Model: Mars 12928
• Capacitance: 4 µF
• Voltage: 440 VAC
• Frequency: 50/60 Hz
• Operating Temp Range: -40°C to +70°C
• Case Style: Oval, aluminum
• Dimensions: 2.125" height × 2.056" width
• Case Height: 1-5/8 inches
• Terminals: Standard ¼-inch male spade connectors

Installation Considerations

Installation must be performed by qualified HVAC personnel. Disconnect power and discharge existing capacitors prior to replacement. Match both microfarad and voltage ratings to OEM specifications. Secure mounting and proper terminal engagement are essential for safe operation. Verify continuity and capacitance after installation using a calibrated multimeter.

Use Case and Compatibility

The 12928 is suited for equipment requiring auxiliary motor support at 4 µF, including fan coils, air handlers, ventilators, and small compressors. Its compact profile is ideal for retrofit applications and OEM replacements where oval dimensions are specified. The capacitor meets or exceeds performance specifications for major HVAC brands requiring this capacitance and voltage combination.

Field-Service Advantages

• ✅ Consistent Capacitance Delivery: Supports system stability and motor longevity under continuous-duty conditions.
• ✅ High Voltage Tolerance: Rated for demanding HVAC environments with elevated operating voltages.
• ✅ Space-Efficient Housing: Oval design fits into bracketed enclosures and narrow compartments.
• ✅ Compliance Ready: Meets applicable UL and EIA-456-A construction standards.