Rheem-Ruud 43-17075-05 Start Capacitor

The Rheem-Ruud 43-17075-05 Start Capacitor is a high-performance OEM replacement part designed to provide the critical starting torque required for single-phase compressor and fan motors. Rated at 189-227 MFD (microfarads) and 330Vac, this round electrolytic capacitor manages the high current surge needed during the initial startup phase of HVAC equipment. Housed in a durable phenolic case, it features a 15-ohm bleed resistor to safely dissipate stored charge, protecting internal components and preventing relay arcing. With physical dimensions of 2.06" in diameter and 4.38" in height, this motor start capacitor utilizes standard 1/4" quick-connect terminals for seamless integration into existing Rheem and Ruud split systems. As a specific Capacitor Code 3 component, it ensures reliable motor cycling in demanding applications, replacing legacy part numbers 8551-55 and 8552-5535 to maintain factory-spec efficiency.

Key Benefits for Professionals

• Optimal Torque Delivery: Corrects low-voltage starting issues by delivering the precise 189-227 µF capacitance required for heavy-duty compressors.
• OEM Compatibility: Exact replacement for Rheem Ruud 43-17075-05, ensuring fitment in proprietary air conditioning and heat pump units.
• Integrated Safety: Features a factory-installed 15-ohm resistor to bleed off voltage, enhancing technician safety during service.
• Industrial-Grade Construction: The phenolic housing is engineered to withstand the thermal stresses of rapid motor cycling and high-ambient environments.

Common Technical Questions

What happens if the capacitance drops below the 189-227 range?
When a start capacitor loses capacitance, the motor may struggle to overcome initial inertia, leading to "hard starts," increased heat buildup in the windings, and potential tripping of the overcurrent protection.

Can I use a 330Vac capacitor to replace a lower voltage rating?
Yes. In HVACR applications, you can always go up in voltage rating (e.g., replacing a 250V with a 330V), but you must never use a lower voltage rating than what was originally specified by the manufacturer.

How do I verify if this start capacitor needs to be replaced?
Technicians should test the part using a multimeter with a capacitance setting. If the reading is more than 10% outside the 189-227 MFD range, or if there is visible bulging or leaking at the terminals, replacement is necessary.

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.