Abstract: The invention relates to a switch-on protection device (1) for an electrical device supplied by a supply voltage, comprising a supply voltage input (2), a switchable electric load (3) and a supply voltage switch (4) arranged in between that can be manually actuated and has the switching positions OFF and ON. The switch-on protection device (1) is arranged in a supply voltage current path to the load (3) and detects the switch position of the supply voltage switch (4) when the supply voltage is applied to the supply voltage input (2). Only in the OFF switching position of the supply voltage switch (4) does it allow closing of the supply voltage path to the electric load (3). By means of two sensor circuits (10, 11), the supply voltage current path is scanned on the input and output sides of the supply voltage switch (4), wherein the output signals thereof are used by an electronic switching element (12) for controlling a semiconductor switching device (6) connected upstream of the load (3).