Functional Devices RIB21CDC Relay

The Functional Devices RIB21CDC Relay is an enclosed, professional-grade solution for contractors looking to isolate high-voltage loads using Class 2 dry contact inputs. Rated for 120-277 Vac power input, this 10 Amp SPDT relay is designed for high-cycle reliability in commercial HVAC, lighting, and industrial control systems. With an expected mechanical life of 10 million cycles, it provides a stable interface between sensitive building automation systems (BAS) and demanding power loads. The enclosed pilot relay design simplifies field installation by eliminating the need for external secondary transformers, as the unit is self-powered via the line voltage input. Its NEMA 1 housing with a 0.50-inch NPT nipple makes it ideal for mounting directly to electrical boxes, while the 1.8-second response time ensures rapid switching performance. This Pre-wired relay is UL listed for plenum use, making it a versatile choice for switching motors, pump cycles, and lighting circuits across a wide operating temperature range of -30 to 140° F.

• Universal Power Input: Operates seamlessly on 120V through 277V circuits, reducing the number of stock units required for different job sites.
• Direct BAS Integration: Standard Class 2 dry contact input allows direct control from thermostats and low-voltage controllers.
• Reduced Wiring Costs: Internal power logic eliminates the requirement for additional 24V transformers to trigger the coil.
• Space-Saving NEMA 1 Enclosure: Compact footprint with an integrated hub allows for secure mounting in tight plenum spaces.
• Visual Diagnostics: Built-in LED status indicator provides immediate confirmation when the relay is activated.

Can I use a single dry contact to trigger multiple RIB21CDC relays?
Yes, you can pair multiple units to a single dry contact input. When doing so, ensure the White/Blue wires are connected to a common point for proper operation.

Is this relay suitable for motor loads?
Absolutely. The Functional Devices RIB21CDC is rated for 1/2 HP at 125 Vac and up to 1 HP at 250 Vac, making it reliable for fan and pump applications.

What is the proper wiring for the dry contact input?
To activate the relay, you must close the White/Red wire to the White/Blue wire. These are separate from the line-voltage power wires (Black and Red/Blue/Orange).

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.