When you’re solving control challenges—from HVAC systems and lighting circuits to complex automation tasks—a small group of relay models consistently proves their value. Functional Devices’ RIB® (Relay-In-a-Box®) line is built for exactly this kind of versatility. These compact, pre-wired relays reduce installation time, simplify wiring, and adapt easily across a wide range of applications. For the most up-to-date specifications, visit the Functional Devices RIB® Relay catalog.
What makes certain RIB® relays essential isn’t just performance—it’s flexibility. Broad voltage compatibility, multiple contact configurations, and proven reliability make them the kind of components technicians and engineers rely on when conditions change in the field.
Below are ten RIB relays that stand out for their universal usefulness in 2026.
Built for Real-World Applications in 2026
These models remain core tools for building automation, HVAC, and control integration projects. From universal coils to high-capacity contacts and network-ready designs, they solve common field problems without requiring custom solutions or specialty parts.
RIBU1C — The Everyday Workhorse
The RIBU1C remains one of the most widely used relays in the RIB lineup. With coil options spanning 10–30 Vac/dc and 120 Vac, plus 10-amp SPDT contacts, it adapts easily across control environments. It’s commonly used in everything from access control and door systems to pumps, fans, and small motor circuits.
RIB2401B — Built for Higher Loads
Designed for heavier switching needs, the RIB2401B offers 20-amp SPDT contacts while maintaining broad coil voltage compatibility. It’s ideal for applications where higher current capacity is required without sacrificing installation simplicity.
RIB2401D — Dual-Pole Control
The RIB2401D allows one control signal to operate two independent circuits at the same time. It’s especially valuable in systems that require synchronized switching without additional relays or wiring complexity.
RIB24P — Dual Circuit Switching at 20 Amps
With a 24-volt coil and 20-amp DPDT contacts, the RIB24P provides reliable two-circuit control in a single enclosure. It also works great to control higher voltage loads (240Vac, for example).
RIBU2C — Two Relays, One Package
The RIBU2C combines two independent 10-amp SPDT relays in a single unit. This design saves panel space and simplifies wiring when multiple control points are needed in compact installations. It also adds redundancy, having an extra relay in the box, in case the first one reaches the end of its lifecycle.
RIBTW2401B-BC — Network-Ready Control
The RIBTW2401B-BC model integrates BACnet communication and binary input capability, extending traditional relay functionality into networked building automation systems. It bridges physical switching with digital control environments.
RIB24P30 — High-Capacity Switching
With 30-amp DPDT contacts, the RIB24P30 is designed for applications that demand higher current handling while still offering dual-circuit or higher voltage load control from a single device.
RIB01BDC — Dry-Contact Activation
Instead of a coil input, the RIB01BDC uses a dry-contact trigger, making it ideal for sensor-based automation, irrigation systems, safety interlocks, and condition-based control logic.
RIB2421B — Multi-Voltage Flexibility
Supporting multiple coil voltages—including 24 Vac/dc, 120 Vac, and 208–277 Vac—the RIB2421B simplifies installations across mixed-voltage environments while delivering 20-amp SPDT switching capability. Great service-truck relay.
RIBRL1S-NS — DIN Rail Simplicity
Designed for DIN rail mounting, the RIBRL1S-NS includes a coil-side manual override switch, making it ideal for control panels, service access, and testing workflows where hands-on control matters.
Why These Relays Matter in 2026
Universal components reduce downtime, speed installation, and simplify troubleshooting. These RIB relays help technicians and engineers avoid over-specifying parts, carrying excess inventory, or redesigning control logic mid-project. Their pre-wired construction, flexible voltage options, and reliable switching performance make them dependable tools across HVAC, lighting, access control, and automation systems.
In an industry that demands adaptability, these relays provide a practical advantage: fewer parts, fewer complications, and faster solutions in the field.
For additional guidance in selecting the right relay for a specific project, the Functional Devices engineering team is available to provide expert support and product recommendations. Contact us today.