MARS 12783 Run Capacitor

The MARS 12783 dual run capacitor is a heavy-duty 35/5 MFD 440V round capacitor engineered for high-performance motor support in residential and light commercial HVAC systems. This component provides the critical phase-shift required for both the compressor and the condenser fan motor, ensuring efficient start-up torque and stable running current. As a direct 35/5 microfarad 440Vac round dual run capacitor, it is the specified field replacement for the Rheem 43-25133-12 and Barker Microfarad units. Constructed with a robust aluminum casing and a patented pressure-sensitive interrupter, this dual run capacitor offers superior reliability under extreme thermal stress, with an operating range of -40°C to 70°C. The 35+5 uF 440V capacitor is dual-rated at 370/440V, making it a versatile staple for most condenser units. Technicians should verify capacitor microfarad ratings using a standard multimeter during seasonal maintenance to prevent premature motor failure. When replacing a bloated HVAC capacitor, ensure the terminals (C, FAN, and HERM) are correctly seated for safe operation.

• Universal Compatibility: This 35/5 440V dual run capacitor serves as a direct drop-in for Rheem 43-25133-12 and replaces various OEM components from Ruud, Protech, and Grainger.
• Enhanced Motor Protection: Provides stable 35 microfarad and 5 microfarad outputs to maintain the proper electromagnetic field in single-phase induction motors.
• Technician-Grade Reliability: Features non-PCB oil and a 1/4 inch quick-disconnect terminal design for efficient service calls and long-term field stability.

What is the difference between 370V and 440V capacitors?
A 440V capacitor, like the MARS 12783, can safely replace a 370V unit, provided the microfarad (MFD) ratings match. However, you should never replace a 440V unit with a lower 370V-rated capacitor, as it will likely fail due to voltage stress.

When should I replace my 35/5 dual run capacitor?
Replacement is necessary if you observe a bulging top, fluid leakage, or if the measured capacitance drifts more than 5-10% from the nominal 35/5 MFD rating. These signs indicate the capacitor can no longer support the compressor motor effectively.

Is the MARS 12783 compatible with Rheem equipment?
Yes, the 12783 is the direct replacement for 43-25133-12, which is a common part number found in Rheem and Ruud air conditioning units.

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.