This Harmony ZB, XB5 single contact block contact block uses spring clamp connection. This contact block allows fast and easy replacement and configuration of your push buttons and selector switches. It is easily installed and replaced on 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 for NO and NC contact block types. Vibration resistant screw clamp connection terminals ensure high vibration resistance making product suitable installation on high impact machine.