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 WITH HOLDER POSSIBLE SPECIAL LOCKS FOR RONIS KEYSWITCHES: SB31, 455, 421 !!! Phased-out product SIRIUS ACT 3SU1 is s Preferred successor type is >>3SU1000-4BN01-0AA0 + 3SU1500-0AA10-0AA0 + 3SU1900-0AX10-0AA0<<