Allen-Bradley 800T-XD4 Pushbutton Contact Block

The Allen-Bradley 800T-XD4 Pushbutton Contact Block is a 30 mm auxiliary block that adds a single normally closed contact to an 800T pushbutton operator. Marketed as a 1-NCLB configuration, this shallow block is designed to companion-mount with Allen-Bradley’s 800T pushbuttons, extending functionality without expanding the overall footprint of the operator assembly. By providing an additional NC contact in a compact form, the XD4 enables simple auxiliary signaling within control circuits while the primary actuation of the 800T pushbutton remains unchanged. The XD4 variant is compatible with the broader 800T/H 30 mm family, supporting consistent hardware across multi-block configurations and enabling straightforward wiring in standard control panels. Its shallow design helps maintain a low-profile control station while delivering reliable NC signaling alongside the main pushbutton.