Allen-Bradley 700-NT220A1 Industrial Timing Relay

The Allen-Bradley 700-NT220A1 is a pneumatic timing unit designed to mount on a Bulletin 700-N relay, serving as a compact timing accessory for industrial control circuits. When the 700-N coil is energized, the pneumatic timing mechanism imposes a timed on-delay before its output changes state to drive a downstream load or interlock. The unit is intended to be used with the 700-N family, with the relay portion supplied separately, and it provides a straightforward timing function without external electronics. Typical applications include sequencing machine operations, delaying a conveyor start after a control pulse, or coordinating interlocks and safety circuits that require a controlled delay. The 700-NT series is documented as a timing accessory that mounts on 700-N relays, identified by the NT designation and your specific suffix, such as 220A1, which denotes a particular configuration within the family. For exact mounting details, electrical interfaces, and acceptable voltage/signal codes for your variant, consult the official Rockwell Automation specifications for Bulletin 700 timing accessories and your 700-N relay version.