Key switch with dismantling protection, blind reversing button, 1-pin. (1 drive), 10 A 250 V ~ with screw terminals for rigid and flexible conductors up to 2.5 mm2 Connection terminals in accordance with DIN VDE 0632 (EN 60669) (screw fastening, without fastening claws) for profile half cylinders with approx. 40 mm total length (DIN 18252), e.g. item no.: 28, 28 G1 The key switch cover can only be removed when the lock is in the unlocking position.