Key switch for extension units, 22 mm, round, plastic, latching, 3 switch positions 1-0-2, 2 make contacts, with 2 keys (including circuit board, contact module) Key switch for extension units, 22 mm, round, plastic, latching, 3 switch positions 1-0-2, 2 make contacts, with 2 keys (including circuit board, contact module) SIMATIC HMI PRO system components Key switch for extension unit
