This head for selector switch is a separate component of the range of control and signaling units, Harmony XB5, plastic, diameter 22mm.It has a dark grey plastic bezel.It is supplied with black special key operated knob.It is easily combined with Harmony range of contact blocks to perform a large variety of control functions.It features 3 positions spring return, /-45°.Its protection index is IP69K / IK06.Its plastic bezel makes it ideal for applications requiring good resistance to chemical agents and/or double electrical insulation.