This is an east-German producted commander switch. In the substation's controll room on the old schematic board are these switches for give command for the breakers, disconnectors, switches. It gives the command, signs the status, signs the protection workings. It's operation is here:

http://www.youtube.com/watch?v=KDfRv-oh3Js

You can turn with this switch, it will light up, but does nothing. You can sign what want you do. If the button lights, you can push in and turn more, the breaker will go ON. It works vice versa too. If the breaker goes OFF by the protection, the button will light on. If you turn back the swich, the light will gone. (If this witch and the breaker have different status, the button lights) I simulate it with two buttons and I do the breaker with a relay, I plan use these switches to control my circuits with computer control. (I have 8 pieces)