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 transformer light module is designed for 277 VAC 50/60 Hz circuits. Light modules have either an incandescent or an LED lamp. This light module has a 6 V incandescent lamp with a BA9 base. This light module is for pilot lights, illuminated push buttons and illuminated selector switches with a lens cap of any color. These light modules are UL Listed and CSA certified.