Trane CPT0977 Run Capacitor

The Trane CPT0977 Run Capacitor is a high-performance 35/5 microfarad 440Vac dual-run component designed for precision motor and compressor support in residential and light commercial HVAC systems. This round dual run capacitor provides the necessary phase shift for efficient motor startup and continuous operation, ensuring your compressor and condenser fan motor work in perfect synchronization. For technicians in the field, this unit serves as a direct, manufacturer-approved replacement for the Trane CPT00977 model, maintaining the exact electrical footprint required for high-voltage applications.

Constructed with high-grade metalized polypropylene and housed in a durable aluminum casing, the 35+5 MFD 440V rating handles the demanding thermal loads of modern cooling equipment. The round can capacitor design facilitates a straightforward fit into standard mounting brackets, while the 1/4-inch quick-connect terminals allow for rapid, secure wiring during service calls. Operating at 440 volts, it offers increased dielectric strength and overhead compared to lower-rated 370V alternatives, making it a reliable choice for maintaining system efficiency and protecting expensive motor windings from premature failure.

• Universal Compatibility: Seamlessly replaces both CPT0977 and CPT00977 part numbers without modification.
• Dual Run Logic: Independently supports the 35 MFD compressor circuit and the 5 MFD fan motor circuit.
• High Dielectric Strength: Rated for up to 440Vac to ensure reliable operation under fluctuating electrical loads.
• Industrial Build: Features a non-PCB, pressure-sensitive interrupter for enhanced safety during catastrophic failure scenarios.
• Precision Tolerance: Standard ±10% capacitance tolerance meets strict OEM performance standards.

Common HVAC Capacitor Questions

Are CPT0977 and CPT00977 interchangeble?
Yes, these two part numbers are identical in specifications, physical dimensions, and electrical capacity.

Can I use a 440V capacitor to replace a 370V unit?
Yes, technicians can safely use a higher voltage-rated capacitor like this 440V unit to replace a 370V version, provided the microfarad (MFD) rating stays at 35/5.

What are the symptoms of a failing run capacitor?
Common signs include a humming compressor that fails to start, the fan motor spinning slowly or not at all, or a visible "bulged" top on the capacitor casing.

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.