LED Lamps, Super Bright - BA 9s Bases A range of super bright LED lamps from the Siemens 3SB3 series. Max. bulb diameter 10 mm Max. operating current 15 mA The Siemens 3SB3 series is a range of plastic and metal commanding devices for front panel mounting and rear wire connection. The 3SBB3 series of pushbuttons, selector switches and indicator lights are of a modern industrial design with a flat construction and are easy to install.