Copeland 940-C411-71 Relay

The Copeland 940-C411-71 Current Relay is a high-precision electrical component engineered for demanding industrial and commercial refrigeration applications. This relay is specifically designed for compressor motor protection by monitoring amperage flow and facilitating the safe disconnection of the start winding once the motor reaches operational speed. Featuring a calibrated 12.7 A pick-up and 10.8 A drop-out rating, it provides reliable switching performance essential for preventing motor burnouts caused by prolonged high-amperage draws or mechanical stalling. As an OEM replacement part, it ensures seamless compatibility with Copeland compressor units, maintaining factory-spec efficiency. The electromagnetic coil and normally open contact configuration allow for rapid circuit engagement, protecting against overload conditions and short circuits. For contractors troubleshooting refrigeration cycles, this relay offers the necessary fast-acting response to stabilize phase start-up and extend the service life of fractional horsepower systems. Solid terminal connections and a rugged housing provide durability in high-vibration environments typical of HVACR installations.

• Precise Amperage Monitoring: Calibrated 12.7A pick-up and 10.8A drop-out ratings ensure accurate start-winding management.
• Enhanced Motor Protection: Prevents compressor failure by mitigating risks associated with overloads and short circuits.
• OEM Compatibility: Direct-fit replacement for Copeland 940-C411-71, ensuring zero-gap integration with existing systems.
• Industrial Durability: Engineered to withstand the thermal and mechanical stresses of 24/7 commercial refrigeration cycles.
• Optimized Performance: Facilitates smooth motor starts to reduce electrical strain on the overall HVACR system.

Common Questions

How do I test the 940-C411-71 current relay with a multimeter?
To verify functionality, measure resistance across the coil; a healthy 940-C411-71 should typically show a very low resistance (approx. 0.12 ohms). Additionally, check for continuity across the normally open contacts when the relay is in the upright (disconnected) position versus when the internal plunger is engaged.

Can this relay be used with a start capacitor?
Yes, the Copeland 940-C411-71 can be utilized in systems with or without a start capacitor, depending on the specific starting torque requirements of the compressor model.

What are the signs of a failing compressor relay?
Typical failure symptoms include pitted or "welded" contacts caused by high amperage arcing, which results in the start winding remaining energized, or carbon buildup leading to high resistance and intermittent starting issues.

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.