Abstract: A protective device includes a first fuse circuit, an overvoltage protection circuit, and a second fuse circuit. The first fuse circuit interrupts a flow of a line current from a voltage terminal to the electrical load when an intensity of the line current reaches a first current intensity limit value. The overvoltage protection circuit electrically connects poles of the voltage terminal when a first voltage limit value of a voltage is reached on the first fuse circuit to force the line current to reach the first current intensity limit value. The second fuse circuit activates the overvoltage protection circuit when a second voltage limit value of a voltage on the second fuse circuit is reached to electrically connect the poles of the voltage terminal. The second voltage limit value is based at least in part on a nominal voltage of the electrical load.

Abstract: A pulse transformer having a primary core (1) with a primary winding (2), a first secondary core (3) with a first secondary winding (4) and a second secondary core (5) with a second secondary winding (6), wherein the primary core (1), the first secondary core (3) and the second secondary core (5) are connected to each other by way of a squirrel-cage winding (7). In accordance with the invention, a transformer current converter is cited that, as a doubler, provides an input signal at two outputs in such a manner that—with an equal number of turns on the first secondary winding (4) and the second secondary winding (6)—the same signal is available at both outputs.