Allen-Bradley 849-ZOD33 Pneumatic Relay

The Allen-Bradley 849-ZOD33 Pneumatic Timing Relay is a pneumatic, off-delay timing relay from the 849 family, designed to insert a controlled delay into electrical control circuits without relying on solid-state timing. Built for indoor use in general‑purpose control panels, it features a NEMA 1 enclosure and operates on 110/120 VAC control voltage, a common standard in many facilities. The timing element is pneumatic, using a synthetic rubber bellows to establish the delay, a hallmark of Bulletin 849 pneumatic timing relays, with the ZOD33 variant specifically indicating an off‑delay timing configuration. As part of the 849-series, it sits alongside related models such as 849-ZAD33 and 849-ZOC33, offering interchangeable timing relay solutions within the same family for different wiring schemes and timing behaviors. Typical applications include sequencing, interlock, and delay coordination tasks in electrical control systems where a timed hold or delayed release is required after actuation, with standard mounting provisions that integrate into AB panels and compatible enclosures.