McQuay Daikin 300043890 Relay

For industrial-grade protection in your high-voltage equipment, the McQuay Daikin 300043890 Relay serves as the primary safeguard for three-phase motor applications. This 32A frame thermal overload relay is engineered specifically to mount to compatible contactors, providing critical motor overload protection by monitoring current draw within a precise 5-8A manual adjustment range. Designed for heavy-duty HVACR environments, this component handles up to 690V line voltage and is dual-rated for 50/60 Hz frequency operation, making it a standard choice for chilled water systems and large-scale commercial air handlers.

The McQuay Daikin 300043890 utilizes a thermal-bimetallic mechanism to detect phase imbalance and sustained overcurrent conditions. When integrating this OEM replacement part, ensure the dial is calibrated to the motor's full-load amps (FLA) to prevent nuisance tripping while maintaining an aggressive defense against motor burnout. This unit is a drop-in HVAC replacement part for specified Daikin and McQuay frames, ensuring electrical continuity and mechanical fit for rapid field restoration.

• High-Voltage Rated: Rated for up to 690V applications, ensuring compatibility with standard industrial power supplies.
• Precise Current Management: Features an adjustable 5-8A trip setting to accommodate specific motor load requirements.
• Robust 32A Frame: Built on a durable 32A frame size for enhanced thermal stability and long-term contact reliability.
• System Efficiency: Minimizes downtime by preventing motor damage from phase loss or overload conditions.

What is the primary function of the 300043890 relay?
This is an overload relay designed to protect HVAC motors by breaking the control circuit if the current exceeds the 5-8A setpoint, preventing winding damage.

Is this relay compatible with both 50Hz and 60Hz systems?
Yes, the technical specifications confirm it is rated for 50/60 Hz, making it suitable for international and domestic equipment configurations.

How do I set the correct amperage on this unit?
Identify the motor's Nameplate Full Load Amps (FLA) and adjust the integrated dial on the front of the relay to match that value for optimal protection.

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.