Siemens – 3SB3110-4FD51
26X26MM SQUARE PLASTIC ACTUATOR: RONIS LOCK WITH 2 KEYS ON THE LEFT MAINTAINED CONTACT, ON THE RIGHT MOMENTARY CONTACT 3 SWITCH POSITIONS I-O-II LOCK NUMBER SB30, REMOVE O+I WITH HOLDER POSSIBLE SPECIAL LOCKS FOR RONIS KEYSWITCHES: SB31, 455, 421