Abstract: The invention relates to an electric switch (102) having a drive shaft (7) that can be actuated by means of a hand crank (5) and a blocking mechanism for blocking actuation of the drive shaft (7) the hand crank (5) has a shaft (6) that can be displaced along the drive shaft (3) and that is, protected against removal by the drive shaft (6) and a crank arm (7) that is axially fixed on the shaft (6) and is wound by the shaft. In order to configure the blocking mechanism in such a way that a blocking force substantially smaller in comparison with the torque of the drive shaft is needed in order to block actuation of the drive shaft (3), a recess (14) is provided on the front side (104) of the switch (102), into which the crank arm (7) can be lowered in anti-rotational manner by displacing the shaft (6), wherein the blocking mechanism that has been activated for blocking fixes the shaft (5) actually once the crank arm (7) has been lowered into the recess (14).

Abstract: The invention relates to a retrofittable earthing device in which a first contact (1) which is to be arranged on the switching device (3) and a second contact (13) which is to be arranged on the module frame (10) by means of a contact carrier (20) are adjacently spring-mounted, during the movement of the switching device (3) from its point of separation into its operating position. In order to relieve the contact carrier (20), in one such device, of electrodynamic effects and thus to make the same easy to assemble, said contact carrier (20) comprises a first partial region (23) for connecting an earthing means, and a second partial region (24) which can be connected to the second contact, in addition to a contact strip (25) connecting the two partial regions.