Schneider Electric Square D ZB2BE101 1-NO Contact Block is an electrical switching component designed for use with compatible pushbuttons and control stations in HVAC control panels. It works by providing one normally open contact that closes when the associated actuator is pressed, allowing electrical signals to control motors, relays, and other system functions. https://www.partshnc.com/zb2be101-schneider-electric-square-d-1-no-contact-block-10-pk