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 2 positions maintained, at 90°. 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.