Run Start Capacitor, Round, 40/10 MFD, 440/370

Jard 40/10 µF Dual Run Capacitor – 440/370V, Round Aluminum Case

The Mars 12798 Jard Dual Run Capacitor is designed for HVAC systems that require consistent capacitive support for both compressor and fan motors. With a 40/10 microfarad configuration and a dual-voltage rating of 370/440 VAC, this component delivers stable electrical performance in split-phase applications, including air conditioning condensers and air handlers.

This round motor run capacitor is built with metallized polypropylene film and housed in a sealed, non-PCB aluminum shell. It is engineered for use in high-duty cycles, temperature-variable environments, and installations requiring both motor-starting and running efficiency from a single unit.

Performance Features

• ✅ Dual Section Output: 40 µF (compressor) and 10 µF (fan) combined in one enclosure.
• ✅ 370/440 VAC Rating: Compatible with standard and high-voltage HVAC configurations.
• ✅ Thermal Operating Range: Designed for environments from -40°C to +70°C.
• ✅ Case Type: Round aluminum can with corrosion-resistant sealed top.
• ✅ Standard Terminal Layout: Includes ¼" quick-connect terminals for fast field installation.

Technical Specifications

• Model: Mars 12798
• Capacitance: 40/10 µF ±6%
• Voltage: 370/440 VAC
• Frequency: 50/60 Hz
• Temperature Rating: -40°C to +70°C
• Case Material: Aluminum
• Configuration: Dual Run, Round Profile

Installation Guidelines

The 12798 capacitor is intended for use by licensed HVAC professionals. Proper discharge and safety procedures must be followed during replacement. Confirm system specifications before installation to ensure voltage and microfarad compatibility. The round form factor allows for direct replacement in standard capacitor mounts, and the dual terminal setup simplifies motor circuit integration.

Application Suitability

This unit is appropriate for systems that require dual-motor capacitance in residential and light commercial HVAC platforms. Its high-voltage tolerance and field-proven dielectric stability ensure reliable startup torque and running performance, particularly in environments subject to temperature variation and heavy cycling.

Contractor-Focused Benefits

• ✅ Reduces Component Count: Replaces two separate capacitors with one integrated unit.
• ✅ OEM Compatibility: Matches common MFD/voltage ratings for rapid field replacements.
• ✅ Service-Grade Durability: Suitable for exposed installations including rooftop units.
• ✅ Electrical Stability: Maintains microfarad rating under thermal and mechanical stress.