Copeland 940-0001-54 Start Relay

The Copeland 940-0001-54 Start Relay is a high-performance potential relay engineered specifically for Copeland semi-hermetic compressors within the CR, CS, RF, and RR series. Designed to handle the rigorous electrical demands of HVACR refrigeration systems, this start relay effectively manages the initial torque required by coordinating the start capacitor during the motor’s start-up phase. Rated for 375 VAC at 60Hz, this OEM replacement part (also referenced as 040-0166-14) provides precision switching to prevent compressor motor overheating and ensure consistent cycles in both residential and commercial applications.

Built for durability in demanding environments, the 940-0001-54 features a compact, rugged housing that stands up to the high amperage spikes characteristic of refrigeration compressor starts. By accurately monitoring the voltage across the start winding and disconnecting the start circuit once the motor reaches functional speed, it protects critical internal components from electrical stress and potential failure. Whether you are performing a routine service or a complete compressor repair, using an authentic Copeland relay ensures seamless compatibility and optimizes the efficiency of cooling systems.

• Precise Electrical Control: Accurate voltage monitoring ensures the start capacitor is removed from the circuit at the optimal millisecond to prevent winding damage.
• High-Load Capability: Rated at 375 Volts, providing the necessary overhead for heavy-duty semi-hermetic compressor applications.
• Reduced Down-Time: Direct OEM replacement for 040-0166-14 simplifies installation for field technicians and contractors.
• Industrial-Grade Construction: Resistant to pitting and oxidation on the internal contacts, mitigating common relay failure points.

• How do I know if my 940-0001-54 relay is failing? Common symptoms include the compressor humming but failing to start, or short-cycling. Techs should check for continuity between terminals 1 and 2; a reading of infinity usually indicates open contacts that require a replacement.
• Is this relay compatible with other brands? This is a Copeland-specific component. While it may cross-reference with certain White-Rodgers potential relays, always verify the potential relay specifications against your compressor's nameplate data.
• What causes these potential relays to fail? Frequent failures are often caused by pitted contacts due to high-voltage surges or an undersized start capacitor causing excessive arcing.

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.