Copeland 940-0001-50 Start Relay

The Copeland 940-0001-50 Start Relay is a high-reliability potential relay engineered for single-phase compressor applications where high starting torque is essential. This genuine OEM compressor relay is designed to manage the high-current startup phase by engaging the start capacitor and removing it once the motor reaches approximately 75% of its synchronous speed. Rated for 336V continuous operation, this unit features a defined pick-up voltage range of 340-360V and a drop-out range of 55-125V, ensuring precise electrical switching for refrigeration start relay cycles and HVAC compressor replacement projects. Its rugged 3-screw terminal configuration and panel-mount design provide a secure interface for field wiring, mitigating common failure points like contact pitting or carbon buildup. For technicians performing HVAC repair or addressing a compressor not starting, this relay serves as a direct cross-reference for the 040-0166-10 and GE 3ARR3T24E5 models, maintaining system efficiency in demanding residential and commercial thermal environments.

• Precision Voltage Control: Optimized 340-360V pick-up and 55-125V drop-out settings ensure accurate timing for capacitor disengagement, protecting windings from overheating.
• Durable Contact Design: Engineered to withstand high-amperage electrical arcing, reducing the risk of contact welding and thermal overload trips.
• Broad Compatibility: Functions as a high-spec replacement for numerous Copeland start relay legacy parts, including the 040-0166-10 series.
• Secure Terminal Interface: The 3-screw terminal layout minimizes resistance and prevents loose connections in high-vibration compressor housings.

How do I verify if the Copeland 940-0001-50 is the correct replacement for my system?
Always match the pick-up and drop-out voltage specifications of your existing relay. This EMERSON potential relay is rated for 336V and is frequently used in high-torque applications. Check the part number on the side of your original compressor start relay to ensure a direct match or verified cross-reference.

Can I mount this relay in any orientation?
No. Most potential relays, including this model, are position-sensitive due to the internal gravity-assisted plunger mechanism. Ensure the "UP" arrow or specified orientation is followed during installation to prevent the contacts from sticking or failing to close properly.

What are the symptoms of a failing start relay?
Common indicators include the compressor humming but failing to cycle, "clicking" sounds from the control box, or the thermal overload protector tripping shortly after startup. These issues often stem from carbon buildup on the internal contacts or a burnt solenoid coil.

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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.