Siemens Furnas 64BB1NC22MM Pushbutton Contact Block

Siemens Furnas 64BB1NC22MM Pushbutton Contact Block is a 1NC contact accessory for 22 mm pushbutton operators, providing a single normally closed contact to extend the functionality of a pushbutton in control panels. It belongs to the Furnas 64BB family of contact blocks and is designed to accompany 22 mm operator assemblies, enabling NC signaling in simple start/stop or interlock circuits. The 64BB1NC22MM designation identifies a single NC contact version intended for 22 mm Furnas pushbutton hardware. This model is listed as discontinued by the manufacturer, meaning it is no longer in production and may be available only through surplus or used listings from third-party distributors. It is typically used as an add-on block to a matching 22 mm Furnas pushbutton to provide NC feedback in the control circuit without changing the actuator. When replacing legacy panels or sourcing spare parts for existing installations, verify compatibility with the specific 22 mm operator series to ensure correct mating and electrical performance.