Harmony XB4 metal emergency stop pushbutton

The Harmony XB4 metal emergency stop pushbutton is a 22 mm panel-mount operator for stopping machinery quickly in a hazard. It has a red mushroom head, typically 40 mm in diameter, on a yellow background collar, and it latches when pressed, requiring a push-pull, turn-release or key release to reset. The contact blocks use positive opening operation in accordance with IEC 60947-5-1, which means the normally closed contacts open even if the contacts have welded. The operator head is made of chromium-plated zamak or stainless-steel-coloured metal, giving a robust finish and a high ingress rating on the front face, commonly IP66 and IP69K for some versions. Screw clamp and spring terminal contact blocks are available, as well as versions with an additional pilot light. It is used on machine control panels, conveyor lines, packaging machines and any equipment that requires an emergency stop function suited to ISO 13850.