Resideo R847A1085 Relay

The Resideo R847A1085 Heavy Duty Relay is a rugged, line-voltage switching solution designed for high-current applications such as industrial fans, pumps, and large-scale heating equipment. Featuring a 120Vac primary voltage and an integral transformer, this unit simplifies field wiring by providing an all-in-one power and control interface within a durable NEMA-rated enclosure. The switching action supports DPST or SPST configurations, making it a versatile choice for contractors managing complex HVACR circuits. With a full load contact rating of 22 Amps at 120Vac and a locked rotor rating of 100 Amps, this relay handles high-inrush inductive loads without premature contact pitting. Its 2-wire low voltage control compatibility ensures seamless integration with standard thermostats and 24V controllers. For professionals requiring reliable heavy-duty motor switching and 120V relay transformers, the R847A1085 delivers industrial-grade performance in a compact, easy-to-mount form factor.

Key Benefits:

• High Current Capacity: Rated for up to 22 Amps full load, ideal for heavy-duty motor and pump applications.
• Integrated Transformer: Internal transformer eliminates the need for external power supplies in 24V control circuits.
• Versatile Switching: Supports both DPST and SPST action to accommodate various wiring requirements.
• Robust Enclosure: Comes in a protective metal housing to ensure longevity in demanding mechanical rooms.
• High Inrush Tolerance: 100 Amp locked rotor rating provides reliable operation during motor startup.

Common Questions:

Can the Resideo R847A1085 be used for 240V switching?
Yes, while it uses a 120Vac primary voltage, the contacts are rated for 10 Amps at 240Vac (50 Amp LRA), allowing it to control 240V loads depending on the amperage draw.

What is the proper wiring for the low-voltage control?
The unit utilizes a 2-wire setup connecting the thermostat to the internal 24V transformer and relay coil terminals for straightforward activation.

Is this relay suitable for resistive or inductive loads?
It is specifically designed for heavy-duty inductive loads like motors and fans but performs equally well on resistive heating elements within its rated capacity.

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.