MARS 12784 Run Capacitor

For high-demand service calls involving condenser fan motor or compressor failure, the MARS 12784 is the industry-standard 35/7.5 MFD 440V dual run capacitor required to restore system equilibrium. This round dual run capacitor is specifically engineered to handle the phase shift requirements of PSC motors in residential and light commercial HVACR equipment. As a veteran-grade HVAC replacement part, it features a non-PCB oil-filled design housed in a rugged aluminum casing to ensure superior heat dissipation during peak summer cycles. The 440Vac rating provides an essential safety margin for 370V applications, preventing dielectric breakdown caused by voltage spikes. With a broad operating temperature range of -40°C to +70°C and a physical pressure interrupter, the JARD 12784 offers a reliable 60,000-hour operational life. This dual section motor run capacitor is the direct OEM replacement for thousands of split-system air conditioners and heat pumps, ensuring your HVAC motor starts under load without excessive current draw.

Key Benefits for Technicians:

• Dual-Rated Performance: Supports both the compressor (35 MFD) and fan motor (7.5 MFD) in a single compact round capacitor footprint.
• High Voltage Versatility: The 440 volt run capacitor rating is backward compatible with 370V systems, reducing the need for multiple truck-stock SKUs.
• Industrial Durability: Features a corrosion-resistant aluminum canister and 1/4-inch quick-connect terminals for fast field installation.
• Safety Certified: UL and CUL recognized with an internal pressure-sensitive interrupter to safely disconnect the device at end-of-life.

Common Questions:

Can I use a 440V capacitor to replace a 370V unit?
Yes. In HVACR applications, you can always increase the voltage rating (e.g., using a 440Vac run capacitor where a 370V was factory-installed), but you must never decrease it. The microfarad (MFD/uF) rating, however, must match the motor's nameplate exactly.

What are the signs that a 35/7.5 MFD capacitor has failed?
Common field indicators include a humming compressor that fails to start, a condenser fan motor that won't spin without a manual push, or visible "mushrooming" or bulging at the top of the aluminum can.

Is the 12784 compatible with both 50Hz and 60Hz systems?
Yes, the MARS JARD series is rated for 50/60 Hz, making it suitable for a wide range of domestic and international power configurations.

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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.