MARS 12931 Run Capacitor

The MARS 12931 Run Capacitor is a heavy-duty 7.5 MFD 440V oval capacitor engineered for constant-run applications in HVACR equipment. Designed to meet or exceed EIA-456-A standards, this 7.5 microfarad motor run capacitor provides essential phase-shifting for high-efficiency compressors and condenser fan motors. The MARS 12931 features a dual-voltage rating of 370V/440V, allowing it to service both 370-volt and 440-volt circuits, making it a versatile stock item for service vans. Built with a non-PCB, biodegradable oil and a robust aluminum casing, it is rated for 60,000 hours of operational life. This HVAC capacitor 7.5 uF includes quadruple blade terminals for flexible wiring and is designed to withstand a wide temperature range of -40°C to +70°C, ensuring reliable torque and motor efficiency in extreme ambient conditions.

Key Benefits for Technicians:

• Universal Application: Dual-rated for 440/370 VAC circuits, reducing the need to carry multiple single-voltage units.
• Environmental Resilience: Professional-grade aluminum casing protects internal metallized polypropylene film from moisture and heat.
• Service Life: Rated for 60,000 hours of continuous duty, significantly exceeding the life cycle of economy-grade capacitors.
• Standards Compliance: Meets UL 810 requirements for safety, including a pressure-sensitive interrupter to prevent casing rupture.
• Compact Oval Footprint: Standard dimensions (2.50" height x 2.06" width) ensure it fits into existing motor mount brackets and tight electrical cabinets.

Common Questions

Can I use a 440V capacitor to replace a 370V capacitor?
Yes. You can always use a higher voltage rating (440V) to replace a lower voltage rating (370V), provided the microfarad (7.5 uF) rating matches. You cannot go lower than the original voltage specification.

What are the symptoms of a failing 7.5 microfarad capacitor?
Common indicators include a humming motor that fails to start, a bulging or leaking aluminum canister, or a motor that trips the thermal overload protector due to poor phase-angle efficiency.

Is the MARS 12931 compatible with 50Hz systems?
The MARS 12931 is rated for 50/60 Hz operation, making it suitable for both domestic and international power frequency requirements.

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.