This key selector switch is part of the range of control and signaling units, Harmony 9001K diameter 30mm metal. It has a chromium-plated metal bezel. It is supplied with black key operated knob. It is easily installed into a standard 30mm diameter panel cut-outs. It features 2 positions spring return operator and is supplied without contacts. The 30 mm Harmony range offers a large choice of robust and reliable products to meet a great number of applications in heavy industries such as petrochemy, metallurgy, mining oil and gas wastewater treatment, automobile manufacturing. It is UL listed and CSA certified, CE declaration of conformity and RoHS compliant.