This Harmony 9001K standard contact block uses screw terminals and has 1 x normally closed contact. It is compatible with Harmony 9001K pushbuttons and switches. This contact block allows for quick and easy replacement and configuration of your pushbuttons and selector switches. It is easy to install and replace on the complete 9001K pushbutton units and selector switches and connects to control circuits using simple screw terminal connections. The clear color of the cover allows the user to visually identify it from a distance. With an IP20 rating, it protects the operator from unexpected contact with live circuits.