Binay Opto Electronics Private Ltd. Manufactures Non-Illuminated Pushbutton Switches. Binay Opto Electronics Private Ltd. Binay Opto Electronics Private Ltd. Also offers LED based pilot lights, aviation obstruction lights, alarm lights, etc. Non-Illuminated Pushbutton Switches is available as SERIES 16-L. It comes in round bezels with 1NC + 1NO or 2NC + 2NO switching elements. They can be provided with switching elements having a capacity of 2A and are available in 1NC + 1NO, 2NC +2 NO, 3NC + 3NO or 4NC + 4NO types. These push buttons have replaceable LED bulbs in midget groove caps which are rated up to 28V AC or DC only. The Non-Illuminated Pushbutton Switches are used for operation at higher voltages, our external HVCC [High Voltage Control Circuit] Unit of the appropriate voltage.