Allen-Bradley 849A-ZOB25 Programmable Relay Module

Allen-Bradley 849A-ZOB25 Programmable Relay Module is a pneumatic timing relay from Allen-Bradley (Rockwell Automation) in the 849/849A family, used to insert timed delays into industrial control circuits. These relays are designed to switch AC loads via their contact array and are rated to 600 VAC across the contacts with a 10 A carrying capacity, making them suitable for mid-range timing and sequencing tasks in older machines, conveyors, and automated lines. The ZOB25 suffix identifies a specific configuration within the vintage catalog; like other 849-series relays, it relies on a pneumatic timing element rather than solid-state timing mechanisms. Though once common in control panels, the 849A-ZOB25 is no longer manufactured; Rockwell Automation discontinued this model on December 31, 2012, and current availability comes from surplus and distributor channels. When evaluating legacy timing relays, verify compatibility with your supply voltage range, load type, and the mechanical timing characteristics of pneumatic timing relays, as well as the physical form factor and mounting method used in older Allen-Bradley panels.