Square D 9001LA21 Contact Block NSMP Series II

The Square D 9001LA21 NSMP Series II normally open contact block adds an auxiliary normally open contact to compatible Square D 30 mm pushbutton assemblies, enabling signaling or interlocking in control circuits without altering the pushbutton’s primary function. Identified by the 9001LA21 part number and described as NSMP Series II, this block is designed to mount with Square D 9001-series operators to extend their switching capability in industrial control panels. In practical terms, it provides an additional NO contact that can be used to feed PLC inputs, indicator circuits, or interlock schemes alongside the operator’s main circuit, making it a common choice for machine controls, conveyors, and automation setups where a second, separate contact is required. The NSMP Series II designation helps distinguish this accessory within the broader 9001 family, ensuring compatibility with the corresponding 30 mm pushbutton hardware and mounting arrangements.