Copeland 940-C411-89 Start Relay

As a veteran HVACR technician, you know that a compressor is only as reliable as its starting components. The Copeland 940-C411-89 Start Relay is a specialized current sensing relay designed for demanding commercial refrigeration and HVAC compressor applications. Engineered to handle high-torque startups, this start relay serves as a critical electric motor starter switch, momentarily engaging the start windings to provide the necessary boost for Copeland compressor operation. It is the designated direct replacement for 040-0150-11 and is compatible with 940 and 945 Series refrigeration machines, providing a seamless field swap for failed legacy components.

Precision-calibrated for exact electrical tolerances, the Copeland 940-C411-89 features a defined pickup current rating of 21.9 Amperes and a dropout current rate of 18.2 Amperes. This SPDT Series 90 configuration ensures that once the motor reaches sufficient speed, the start circuit is cleanly disconnected to prevent winding overhead or damage. Built for durability in high-cycle environments, this OEM replacement part maintains system efficiency across Style C and S refrigeration units, including 137 MOD, 601 MOD, and 602 MOD configurations. When you are troubleshooting a compressor that struggles to turn over under load, verifying the potential relay or current relay specs is the first step; this unit delivers the exact electrical profile required for factory-spec performance.

Key Benefits

• Direct OEM Compatibility: Serves as the official replacement for 040-0150-11, ensuring refrigeration machine specs are met without modification.
• High Amperage Capability: Rated for a 21.9A pickup and 18.2A dropout, ideal for heavy-duty start relay applications.
• Broad Application Range: Validated for use in Copeland centrifugal and scroll compressors across NEMA-rated commercial systems.
• Superior Reliability: Robust current-sensing technology reduces the risk of compressor motor burnout by ensuring precise start-winding disengagement.

Common Questions

What is the difference between the 940-C411-89 and the 040-0150-11?
The 940-C411-89 is the current OEM service replacement for the older 040-0150-11 part number. It maintains identical electrical characteristics, including the 21.9A pickup and 18.2A dropout ratings, making it a drop-in solution for maintenance and repair.

Which compressor models are compatible with this start relay?
This current relay is specifically designed for Copeland 940 and 945 Series refrigeration units and is frequently found on MOD 137, 601, and 602 compressors used in forced-air refrigeration circuits.

Why is my compressor hum-tripping instead of starting?
If the start relay fails to close the circuit to the start capacitor and windings, the motor will hum and trip the internal overload. Replacing a pitted or failed 940-C411-89 restores the high-amperage path needed to overcome head pressure during startup.

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.