MARS 12078 Run Capacitor

The MARS 12078 Run Capacitor is a high-performance 40/3 MFD 440V round dual run capacitor engineered for demanding HVACR applications. This MARS Blue Box series component provides the necessary phase shift for starting and running both the compressor and the condenser fan motor in residential and commercial air conditioning systems. With a dual-section design, it consolidates two capacitance values into a single, compact housing, meeting EIA-456A industry standards for 60,000 hours of operations. Its non-PCB, oil-filled construction includes a physical interrupter for safety, ensuring the circuit is opened in the event of an internal pressure buildup. This 440Vac unit is fully compatible with 370V systems, offering a robust teardrop-resistant solution for technicians replacing older Jard, Mars2, or RectorSeal components. The MARS 12078 is UL listed and CSA certified, making it a reliable choice for maintaining motor efficiency and extending the lifecycle of HVAC equipment.

• Dual-Section Performance: Houses both 40 MFD (compressor) and 3 MFD (fan) circuits for streamlined wiring and replacement.
• Enhanced Safety: Built-in pressure-sensitive interrupter and non-PCB oil provide safe failure modes.
• Broad Compatibility: Rated for 440Vac, making it a suitable and high-rated replacement for 370Vac capacitors.
• Standard Compliance: Meets EIA-456A standards and is UL/CSA certified for professional-grade reliability.

Common Questions

Can I use the MARS 12078 to replace a 370V capacitor?
Yes. A 440V capacitor like the 12078 is a technical upgrade and can safely replace a 370V unit of the same capacitance, as it is built to handle higher voltage stress.

What happens if I use the wrong MFD rating?
Using an incorrect microfarad rating can cause motor overheating, decreased efficiency, or premature winding failure. Always match the 40/3 MFD rating specified by the equipment manufacturer.

Is this a round or oval capacitor?
The MARS 12078 is a round-case design, commonly used in newer condenser units for more efficient internal space utilization.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.