Copeland 940-C411-79 Relay

The Copeland 940-C411-79 is a high-duty 30A 277V Relay designed for heavy-duty switching in commercial HVACR and industrial control systems. As a critical current relay replacement, this component is engineered to handle inductive loads with a calibrated pick-up of 16.5A and a precise drop-out of 13.8A. Its robust construction ensures reliable circuit engagement even in high-ambient environments, making it a standard choice for protecting Copeland compressor motor circuits and managing high-current power supplies. For technicians in the field, this relay's normally open contact structure and 277-volt rating provide the necessary capacity for industrial HVAC control. Whether you are troubleshooting a failing motor starter or performing a scheduled system overhaul, the 940-C411-79 relay kit offers the mechanical durability needed to prevent contact welding and ensure consistent electrical throughput under demanding cycle rates.

• High Amperage Capacity: Rated for 30A at 277V, providing overhead for heavy inductive loads.
• Precise Switching: Features a factory-set 16.5A pick-up for accurate circuit activation.
• Industrial Durability: Robust housing designed to withstand the vibration and thermal stress of commercial refrigeration units.
• Universal HVAC Application: Optimized for compressor protection, lighting controls, and automation systems.

What are the symptoms of a failing Copeland 940-C411-79 relay?
Common indicators include intermittent compressor operation, audible erratic clicking, or a "welded contact" state where the load remains powered even when the control signal is removed. High resistance across the contacts often points to pitting or carbon buildup.

Can I use this relay for 240V applications?
While rated for a maximum of 277V, this relay is commonly used in 208/240V systems. Always verify the specific pick-up and drop-out amperage requirements of your equipment to ensure the 16.5A/13.8A thresholds align with the motor's operating curve.

Is this a direct replacement for my existing compressor relay?
This part is a standard Copeland service replacement. Check your existing part number; the 940-C411-79 frequently replaces older 040-series potential or current relays utilized in specific HVAC configurations.

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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.