Electrical isolation circuit between a first section (21 a) of electric line and a second section of electric line, comprising: ▪ an input terminal (11 a) capable of being connected to the first section of electric line, ▪ an output terminal capable of being connected to the second section of electric line, ▪ a switch circuit (14, 34) able to adopt a closed position in which it electrically connects the input terminal to the output terminal, and an open position, in which it electrically isolates the input terminal from the output terminal, and ▪ a short-circuit detection module comprising: - a measuring circuit capable of determining a voltage called test voltage (U tst), and a voltage called check voltage (U chk), the test voltage and the check voltage being representative of a voltage at a point (17, 37) in the switch circuit, and - a control circuit arranged in order to determine a waiting time (Δ wt) as a function of the test voltage, in order to provide the measuring circuit, at the end of the waiting time, a determination of the check voltage, and to control, as a function of the check voltage, the opening or not of the switch circuit at the end of the waiting time, the switch circuit comprising two controlled switches (341, 342) and two diodes (343, 344), the controlled switches being controlled by the control circuit and being connected in series between the input terminal and the output terminal, a shared connection point between the first and second switches being called "central node", each diode being connected in parallel to one of the controlled switches, the diodes being connected to each other by their cathode. ▪ an input terminal (11 a) capable of being connected to the first section of electric line, ▪ an output terminal capable of being connected to the second section of electric line, ▪ a switch circuit (14, 34) able to adopt a closed position in which it electrically connects the input terminal to the output terminal, and an open position, in which it electrically isolates the input terminal from the output terminal, and ▪ a short-circuit detection module comprising: - a measuring circuit capable of determining a voltage called test voltage (U tst), and a voltage called check voltage (U chk), the test voltage and the check voltage being representative of a voltage at a point (17, 37) in the switch circuit, and - a control circuit arranged in order to determine a waiting time (Δ wt) as a function of the test voltage, in order to provide the measuring circuit, at the end of the waiting time, a determination of the check voltage, and to control, as a function of the check voltage, the opening or not of the switch circuit at the end of the waiting time, - a measuring circuit capable of determining a voltage called test voltage (U tst), and a voltage called check voltage (U chk), the test voltage and the check voltage being representative of a voltage at a point (17, 37) in the switch circuit, and - a control circuit arranged in order to determine a waiting time (Δ wt) as a function of the test voltage, in order to provide the measuring circuit, at the end of the waiting time, a determination of the check voltage, and to control, as a function of the check voltage, the opening or not of the switch circuit at the end of the waiting time,