Allen-Bradley 849-Z0D321 Pneumatic Timing Relay

The Allen-Bradley 849-Z0D321 Pneumatic Timing Relay is a 120 V AC timing relay from Allen-Bradley’s Bulletin 849 family, designed to provide a controlled time delay in industrial control circuits. As a pneumatic timer, it uses a pneumatic silicon bellows mechanism to convert an input signal into a timed pneumatic action, delivering an output after a defined delay. The unit is intended for use in control panels and automated equipment where reliable on-delay timing is required, offering rugged construction for industrial environments and operation across a wide temperature range. Typical applications include sequencing and interlocks in manufacturing lines, machine startup/shutdown routines, and safety interlocks where a precise, repeatable delay between an input and output is needed.