Harmony 9001K and 9001SK 30mm control and signaling range has a large choice of products to meet a great number of applications in heavy industries. These product lines have a large variety of push buttons, selector switches and pilot lights. Illuminated devices in this product line use a replaceable light module to do the illuminating. These light modules provide clear visual feedback on the status of the machine. The various light modules can be used on a range voltages from 6 to 600 VAC or 6 to 480 VDC. This light module with internal resistance is designed for 24 to 28 VAC or VDC circuits. Light modules have either an incandescent or an LED lamp. This light module has a blue LED lamp. This light module is for pilot lights, illuminated push buttons and illuminated selector switches with a clear lens cap. These light modules are UL Listed and CSA certified.