Allen-Bradley 849-ZOD33 Pneumatic Timing Relay is an open-type industrial timing device in the 849 family that delivers an adjustable pneumatic off-delay to control downstream equipment. The 849-ZOD33 variant is the open enclosure option and operates from 120 VAC, 60 Hz; corresponding enclosure versions include 849-ZAD33 (Type 1 general purpose) and 849-ZCD33 (Type 4/4X watertight). It uses a pneumatic bellows timer and a dial indicator to set the delay, enabling precise sequencing of relays, valves, and actuators in machine-control panels. Typical applications include timing sequences in conveyors, presses, and other automation circuits where a reliable time delay is required.
