Run Start Capacitor, Round, 40/5 MFD, 440/370

Jard 45/10 µF Dual Run Capacitor – 440V, Round Aluminum Case

The Mars 12872 Dual Run Capacitor provides stable reactive power to single-phase HVAC systems that utilize both a compressor and fan motor. With dual capacitance values of 45 µF and 10 µF, and rated for 440V operation, this component supports high-performance operation in both residential and light commercial air conditioning systems.

This capacitor features metallized polypropylene film dielectric enclosed in a non-PCB, oil-free aluminum case. Designed for continuous-duty service and built to industry-standard form factors, the 12872 model ensures compatibility and long-term stability in field environments with high electrical and thermal stress.

Product Highlights

• ✅ Capacitance: Dual-rated at 45 µF (compressor) and 10 µF (fan motor) for combined motor support.
• ✅ Voltage Rating: 440 VAC – Suitable for high-voltage systems with elevated run conditions.
• ✅ Operating Temperature: -40°C to +70°C – Stable in rooftop, attic, or ambient-exposed installations.
• ✅ Dielectric: Metallized polypropylene film – Self-healing design enhances electrical durability.
• ✅ Housing: Round aluminum case – Corrosion resistant, sealed top, non-PCB compliant.

Technical Specifications

• Model: Mars 12872
• Capacitance: 45/10 µF ±6%
• Voltage: 440 VAC
• Frequency: 50/60 Hz
• Case Type: Round aluminum
• Terminals: ¼" quick-connect spade terminals

Installation Overview

This capacitor is designed for use by licensed HVAC technicians. Prior to installation, ensure system voltage is isolated and the original capacitor is fully discharged. Confirm compatibility with equipment specifications (µF and VAC rating). The 12872 mounts securely using standard brackets and connects via quick-connect terminals, streamlining field replacements and reducing installation time.

Use Case

Ideal for condensing units and air handlers requiring dual-capacitance support in a single component. The Mars 12872 simplifies service by replacing two separate capacitors with one unit. It is compatible with a wide range of HVAC systems and supports consistent motor performance across varied load conditions.

Professional Advantages

• ✅ Dual Motor Support: Simplifies wiring in HVAC units with both compressor and fan motors.
• ✅ Universal Fit: Designed to meet industry-standard sizing and terminal layout.
• ✅ Field Reliability: Proven stability across seasonal temperature ranges and frequent cycling.
• ✅ HVAC Ready: Preferred by service professionals for its electrical integrity and ease of replacement.