Allen-Bradley 700-HT12BU120 Time Delay Relay

Allen‑Bradley 700-HT12BU120 is a general‑purpose tube‑base timing relay (on‑delay) designed for industrial control panels. It features a DPDT (two Form C) output that energizes after a user‑adjustable delay when the 120 V AC/DC coil is energized, enabling precise sequencing in machines and control circuits. The timing range is 1.0 to 100 seconds, making it suitable for tasks such as staggered motor starts, delay interlocks, and timed safety interlocks. It uses a tube‑base socket for plug‑in installation, simplifying replacement and wiring. The coil is rated for 120 V AC or DC, offering compatibility with common control circuits powered from 120 V mains. The unit belongs to Allen‑Bradley’s 700‑HT family of timing relays, known for On‑Delay configurations and rugged tube‑base construction. Typical applications include machinery sequencing, conveyor interlocks, and any control loop requiring a reliable delay before the output energizes. The 700‑HT line provides durable, rigid timing during control cycles, with a contact arrangement that supports both NO and NC functions via the DPDT configuration, enabling flexible wiring schemes. This specific variant, 700-HT12BU120, delivers 1.0–100 s timing with a 120 V AC/DC coil and a DPDT output for robust, two‑circuit control from a single relay.