Switch, especially load-disconnector switch

The invention relates to a switch (1) which comprises a switch (2) comprisinga housing (5), a drive shaft (8), a lock-up element (14) and an outward housing projection (6), the drive shaft rotates around the longitudinal axis so as to operate the switch between the off position (OFF) and the on position (ON), the lock-up element sleeves the free end of the drive shaft in anti-rotating way, and thelock-up element extends towards the housing projection. According to the rule of the invention, the lock-up element in a switch position (EIN, AUS) can shift from the first angle position to the second angle position or in inverse way, at least one notch (11) is arranged on the lock-up element, the area on the notch (11) in the housing projection is opened through the lock-up element when being in the first angle position, a block element can insert through the notch from outside, the block element blocks the rotation of the lock-up element when inserting in, and the lock-up element extends towards the area of the no