The Allen-Bradley 849-ZAA321 Pneumatic Timing Relay is a compact timing device used in industrial automation to regulate the sequence of pneumatic and electrical actions within control panels. It operates from a 220-240 V AC coil and is suitable for 50/60 Hz operation, with a NEMA 1 enclosure designed for indoor, general-purpose installations. This 849-series relay uses a pneumatic timing mechanism—typically based on a bellows design—to deliver a defined delay before energizing or de-energizing a downstream actuator, making it well-suited for valve actuation, cylinder sequencing, and other timed control applications in automated systems.
