This Harmony ZB, single contact block uses screw clamp terminals.::This contact block allows fast and easy replacement and configuration of your push buttons and selector switches.::It is easily installed and replaced on XB4 or XB5 complete push-button units and selector switches via a clip assembly and connects to control circuits with simple screw-clamp connections.::It protects operators from unexpected contact with live circuits thanks to its IP20 protection index.::1 million cycle high endurance under 6A load allows less maintenance and damage in your installation.::It has clear color scheme.::Vibration resistant screw clamp connection terminals ensure high vibration resistance making product suitable installation on high impact machine.