Allen-Bradley 849Z0D321B Pilot Duty Relay 10A 600VAC

Allen-Bradley 849Z0D321B is a pneumatic timing relay from Bulletin 849, AX-style open-type equipment designed for pilot-duty control in industrial automation. It provides a delayed output to energize downstream devices after a defined interval, enabling safe sequencing of relays, contactors, and actuators in control circuits. The unit is specified to switch a pilot load up to 10 A at 600 VAC and uses a 120 VAC coil to initiate the timing action, aligning with typical 849-series timing relays. This device is commonly employed in applications requiring precise on-delay or interlock sequences—such as machine tools, conveyors, and automated production lines—where control logic must be timed without enclosing the hardware.