Allen-Bradley 849A-Z0D25 Timing Relay

Allen-Bradley 849A-Z0D25 Pneumatic Timing Relay is a Bulletin 849A timing device that delivers a controlled off-delay interval in industrial control circuits. This open-style, pneumatic timer uses a screw-type needle valve to adjust the air flow and set the delay, providing repeatable timing without electronic components. The unit is designed for 120V AC at 60 Hz or 110V AC at 50 Hz operation, and it is described as an off-delay timing relay with a NEMA Type Open enclosure suitable for rugged environments. As part of the 849A family, the 849A-Z0D25 represents a specific timing configuration within the legacy Allen-Bradley line, built to deliver simple, mechanical timing control in automation applications that relied on pneumatic timing units rather than solid-state timing. This relay is typically installed in control circuits where a timed restart or sequencing delay is required, with timing set by the adjustable needle valve.