Copeland 940-0088-02 Current Relay

The Copeland 940-0088-02 Current Relay is a high-precision OEM component designed for small fractional-horsepower single-phase compressors. Engineered for specific electrical load requirements, this Copeland compressor start relay features an amperage rating of 17.4 A Pick-Up and 14.3 A Drop Out. It functions by utilizing the high inrush current of the run winding to momentarily engage the starting circuit, providing the necessary torque for the rotor to reach operational speed before automatically disconnecting. As a genuine 940-0088-02 relay, it ensures seamless compatibility with commercial and industrial refrigeration equipment, preventing common issues such as short cycling or motor overheating caused by delayed circuit disengagement. This current-sensing device is built to rigid HVAC start relay standards, maintaining system stability and preventing damage to critical refrigeration circuits. Its compact refrigeration relay design allows for standard mounting configurations, facilitating fast replacement for field technicians focused on minimizing system downtime.

• Precise Electrical Control: Accurate 17.4A pick-up and 14.3A drop-out thresholds ensure consistent cross-line performance and compressor motor protection.
• OEM Standards: Genuine Copeland 940-0088-02 construction guarantees proper fitment and prevents the impedance issues common with universal aftermarket parts.
• Enhanced Starting Torque: Effectively bridges the starting circuit during high-load intervals, crucial for systems operating in demanding ambient conditions.
• Field Reliability: Heavy-gauge internal coil winding resists thermal breakdown, ensuring stable operation across a broad range of fractional HP compressor applications.

How do I verify if the 940-0088-02 is functioning correctly?
Use a clamp-on ammeter to monitor the starting circuit; a functioning relay will show a momentary amp draw that drops to zero as the compressor reaches speed. You can also check the coil resistance with an ohmmeter, which should typically read approximately 1 ohm.

Can this relay be used with a start capacitor?
The Copeland 940-0088-02 is application-specific. If your wiring configuration includes multiple taps for a starting capacitor, it can be integrated into the pilot circuit to further increase starting torque on single-phase units.

What are the symptoms of a failed current relay?
Failures usually manifest as a "humming" compressor that trips the internal overload or a motor that fails to rotate despite having the correct supply voltage. Stuck contacts may keep the start winding energized too long, leading to premature motor failure.

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.