Siemens 3SB03-2MKB is a 30 mm diameter selector switch with a black knob operator and two maintained positions. The maintained action latches in each state, providing a persistent indication of the selected position for panel-mounted control in industrial equipment. Verified listings identify this exact model as 3SB03-2MKB with a black knob, 2-position, 30 mm format from Siemens.
