Trane CPT0668 Run Capacitor

The Trane CPT0668 Run Capacitor is a high-performance 40/5 uF 440V dual round run capacitor specifically engineered for demanding residential and commercial HVACR applications. As a genuine Trane OEM replacement part, this capacitor ensures proper phase shift for compressor and fan motor windings, maintaining high power factor efficiency in Trane air conditioning units and heat pumps. Built to withstand high operating temperatures, the CPT0668 is rated for 440VAC, making it a robust alternative for systems originally utilizing 370V components. When troubleshooting motor start failures or identifying "distended" capacitor shells during PM inspections, installing this 40+5 MFD 440V capacitor restores the necessary torque and current stability to prevent motor overheating and premature compressor failure. For service technicians, utilizing Trane HVAC replacement parts like the CPT0668 ensures physical fitment compatibility and adherence to factory microfarad tolerances.

Key Technician Benefits

• Dual-Run Versatility: Integrated 40 microfarad and 5 microfarad sections support both the compressor and the condenser fan motor from a single housing.
• 440VAC Rating: Provides superior dielectric strength and reliability compared to lower-rated 370VAC alternatives.
• OEM Specification: Maintains factory-set electrical parameters, essential for high-efficiency Trane and American Standard scroll compressors.
• Environmental Resilience: Designed to handle the aggressive heat cycles found in outdoor condensing units.
• Physical Compatibility: Standardized round canister diameter allows for rapid installation using existing mounting straps.

Common Technical Questions

Can I use a 440V capacitor if my original was rated for 370V?
Yes. In HVACR applications, you can always increase the voltage rating of the capacitor (e.g., from 370V to 440V), as this indicates a higher insulation breakdown threshold. However, you must never decrease the voltage rating or deviate from the microfarad (uF) specification.

What are the symptoms of a failing CPT0668 capacitor?
Common indicators include the compressor "humming" but failing to start, a tripped breaker, or a visible bulge at the top of the capacitor, which activates the internal pressure interrupter to safely disconnect the circuit.

Is the Trane CPT0668 compatible with other brands?
While this is a Trane OEM part, it can be used in any HVAC system requiring a 40/5 MFD dual round capacitor at 370V or 440V, provided the physical dimensions fit the mounting area.

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.