White-Rodgers 90-476 Fan Relay

The White-Rodgers 90-476 is a heavy-duty enclosed fan relay engineered for switching high-voltage HVAC loads in commercial and industrial applications. This SPDT fan relay features a 277 VAC coil specifically designed for 50/60 Hz systems, providing a reliable interface for fan motor control and general heating or cooling switching. With a 10300 Ohms DC resistance and a nominal current draw of 10.8 mA, this relay maintains high efficiency with a 3 VA nominal power rating and a 4 VA inrush capacity. The compact, totally enclosed design protects the silver-cadmium oxide contacts from airborne contaminants, ensuring consistent performance in demanding mechanical rooms. Designed for field technicians, it includes 1/4" quick-connect terminals for rapid installation and fits the footprint for standard Type 193 relay replacements, making it a staple for maintaining high-voltage air handlers and fan coil units.

Key Benefits for HVACR Technicians:

• High-Voltage Compatibility: Explicitly rated for 277V systems, making it the standard choice for industrial lighting and HVAC control circuits.
• Heavy-Duty Contact Rating: Features an inductive rating of 12 Amps and a resistive rating of 18 Amps at 277 VAC for robust load management.
• Universal Mounting: Operates efficiently in any position, allowing for flexible mounting within crowded control panels.
• Quiet Operation: The precision-wound coil and enclosed housing reduce mechanical hum and chatter during operation.
• Standardized Terminal Layout: Direct replacement for Emerson WR90-476, simplifying the troubleshooting and replacement process for service calls.

Common Questions:

Can the 90-476 be used in 208V or 240V applications?
While the 277V coil is optimized for high-voltage industrial circuits, it is critical to match the coil voltage with your control transformer. Using this on a lower voltage control circuit may result in failure to pull in the contacts.

What is the difference between SPDT and SPNO relays?
The SPDT configuration (Single Pole Double Throw) provides both a normally open (NO) and normally closed (NC) contact set, offering more versatility in fan speed control or interlocking circuits compared to a single-throw relay.

Is this relay suitable for continuous duty?
Yes, the White-Rodgers 90-476 is designed for continuous duty cycles, provided the ambient temperature stays within the professional range of -40°F to 150°F.

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.