A di - protective device (1) with a summation current transformer (2) and the secondary side with the latter is connected with a voltage-dependent starting circuit (5) as well as with a trigger (7) for the actuation of a switch (8) in the connected conductor network (l, n) of the invention comprises a from the starting circuit (5) driven first electronic switch (10) and a with this as well as via a rectifier (d1) with the trigger (7) is connected to the second electronic switch (6) which, on the one hand, as a voltage regulator (8) for setting a supply voltage (u, v, φ φ) of the tripping circuit (5), and on the other hand, in order to fulfill of a tripping criterion (u φ f φ) the release device (7) is actuated.
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