AUTONOMOUS SECURITY DEVICE AND ELECTRIC SYSTEM COMPRISING SUCH A DEVICE

Security device comprising: a. a main input terminal (A) which is intended to be connected to a first direct-current voltage source (BAT), b. a main output terminal (B) which is intended to be connected to a first electronic apparatus (Ep1) and to a second electronic apparatus (Ep2), c. a switching device (10) comprising an input terminal (E), an output terminal (S) and a control terminal (G), the input terminal of the switching device (10) being connected to the main input terminal (A), the output terminal of the switching device (10) being connected to the main output terminal (B), the switching device (10) comprising at least one first switch (Q1), the control terminal (G) of the switching device (10) being connected to a control device (30) so as to open or close the at least one first switch (Q1), d. a filtering device (20) which is connected between the current input terminal (E) and the control terminal (G) of the switching device (10); the security device being characterised in that: the filtering device (20) controls the switching device (10) in the linear zone thereof when the switch control device (30) is inactive and a discharge current passes through the stray inductance (L) between the first apparatus (Ep1) and the second apparatus (Ep2).