Functional Devices RIBD2421C Relay

Professional-grade Functional Devices RIBD2421C is a versatile enclosed time delay pilot relay designed for demanding building automation and HVACR applications. This 10A SPDT relay features a universal coil capable of accepting 24VAC/DC or 120-277VAC, providing extreme flexibility for field installations. The RIB series "Relay in a Box" design integrates the relay, housing, and pre-wired 16-inch 600V leads into a single NEMA 1 enclosure, significantly reducing labor time on the job site. Engineered for precision, the RIBD2421C utilizes a delay on make (N/O) timing logic, adjustable via 4-position DIP switches and a potentiometer to cover ranges from 6 seconds to 20 minutes. With a mechanical life rating of 10 million cycles and a wide operating temperature range of -30 to 140°F, this unit is built to withstand rigorous industrial environments while ensuring reliable control of secondary loads like circulating fans or auxiliary heaters.

• Universal Compatibility: Multi-voltage input (24V and 120-277V) eliminates the need to carry multiple specific relay models.
• Contractor-Ready Design: Pre-wired with a 1/2-inch NPT nipple for immediate mounting into standard electrical knockouts.
• Visual Diagnostics: Built-in LED indicators provide immediate status for relay activation (Red) and timing sequences (Pink Flashing).
• Adjustable Timing: Onboard DIP switches allow for precise calibration of timing intervals between 6s and 20m.
• Plenum Rated: Suitable for installation in air-handling spaces, satisfying UL916 Energy Management standards.

How do I adjust the time delay on the RIBD2421C?
The unit features a 4-position DIP switch for selecting the primary time range and a single-turn potentiometer for fine-tuning the exact duration within that range.

Can this relay be used for high-horsepower motor starting?
The contacts are rated for 10 Amps general use at 277VAC and can handle up to 1/2 HP at 125VAC or 1 HP at 250VAC. For higher horsepower requirements, use this pilot relay to drive a larger contactor.

What is the purpose of the secondary LED?
The LED provides two-stage feedback: a solid Red light indicates the relay coil is energized, while a flashing Pink light signifies the time delay sequence is currently in progress.

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.