Copeland 940-C411-82 Start Relay

Repairing single-phase compressors requires a high-quality current starting relay to ensure reliable motor ignition. The Copeland 940-C411-82 Start Relay is a genuine OEM component specifically calibrated for heavy-duty HVACR applications, including industrial refrigeration and commercial cooling systems. This current-sensing relay is designed to manage the precise transition between the start and run windings of the compressor motor. It features high-amperage switching capabilities, with a 17.8 Amp pick-up and a 14.9 Amp drop-out rating, making it ideal for high-torque startups where initial inertia must be overcome quickly to prevent compressor humming or thermal overload trips.

Built with silver cadmium oxide contacts for extended lifecycle performance, the 940-C411-82 relay provides robust protection against contact pitting and welding, which are common causes of system failure in short-cycling environments. Its compact, non-position sensitive design allows for flexible mounting on various Copeland compressor models, serving as a direct replacement for legacy part number 040-0150-01. Using this HVAC compressor start relay ensures compatibility with factory specifications, maintaining the starting torque required for efficient operation in systems utilizing capillary tubes or fixed orifice metering devices.

• Precise Current Sensing: High-tolerance 17.8A pick-up ensures the start winding is energized only during the critical ignition phase.
• OEM Compatibility: Specifically engineered for Copeland compressors, replacing outdated or discontinued relays like the 040-0150-01.
• Durable Construction: Features heavy-duty internal components to handle the high electrical loads of refrigeration start cycles without overheating.
• Versatile Application: Suitable for domestic reached-in coolers, ice machines, and small commercial AC units.

• How do I test a 940-C411-82 start relay? Use a multimeter to check for continuity across the coil and the normally open contacts. When inverted, gravity should close the contacts, showing low resistance.
• Will this relay fix a humming compressor? If the compressor is humming but not starting, it often indicates the relay is failing to energize the start winding or a bad start capacitor is in the circuit.
• Is a start capacitor required with this relay? This specific model is a current relay; while it can operate independently, it is often paired with a capacitor in high-torque restart scenarios.

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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.