This light blocks is a separate component of the range of control and signaling units, Harmony 9001K / 9001SK diameter 30mm. It is supplied with 12V AC/DC via integral resistance and includes a BA 9s 6 V bulb incandescent. It is compatible with pilot lights and illuminated pushbuttons of Harmony 9001K and Harmony 9001SK ranges. It weighs 50g. 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.