Rheem-Ruud 43-25133-28 Run Capacitor

When you are out on a secondary service call for a condenser that is humming but not starting, the Rheem-Ruud 43-25133-28 Run Capacitor is the precise OEM replacement you need to restore system operation. This 55/3 Microfarad 370Vac Round Dual Run Capacitor is engineered specifically for high-demand HVACR environments, providing the exact phase shift required for both the compressor and the condenser fan motor. Built to satisfy UL 810 safety standards, this component features a metal oil-filled construction and 1/4 inch quick-connect terminals to ensure a secure, low-resistance connection during high-amperage cycles. As a veteran-grade HVAC dual run capacitor, it handles internal heat dissipation far better than generic alternatives, which is critical during peak summer loads. Whether you are performing routine maintenance or an emergency motor repair, using this HVAC replacement capacitor ensures the circuit maintains the correct power factor, protecting the motor windings from premature failure due to voltage instability.

• Precise Capacitance: Provides a 55 MFD rating for the compressor and 3 MFD for the fan motor to ensure synchronized startup.
• Standardized Form Factor: The round case design fits standard mounting straps in Rheem, Ruud, and WeatherKing condensing units.
• Robust Voltage Rating: Rated for 370Vac to safely handle standard residential 230V applications with plenty of headroom.
• Industrial Connections: Standardized multi-terminal prongs (4-3-2) allow for easy jumpering and landing of multiple leads.

Can I use a 440V capacitor to replace this 370V model?
Yes. You can always up-rate the voltage. A 440Vac capacitor will provide a thicker dielectric and can substitute for a 370Vac unit, provided the MFD ratings (55/3) remain identical.

What are the signs that this 55/3 MFD capacitor has failed?
Technicians should look for a "bulged" or mushroomed top, which indicates the internal pressure relief has tripped. Electrically, if the compressor is drawing locked rotor amps (LRA) but failing to turn over, the 55 MFD side is the likely culprit.

Does it matter which way the wires are connected to the terminals?
Yes. You must land your common wire on 'C', the compressor start wire on 'Herm', and the fan motor wire on 'Fan'. Reversing these can damage the motor windings or the capacitor itself.

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.