High-voltage solid-state switch that is intended to be connected in series with a load to be protected, this switch including: - at least two electrical switching means (2A, 2B) that are connected in parallel, the two switching means being based on different technology; - measurement means that are intended to measure a voltage across the terminals of the electrical switching means 2A, 2B and a main current (Ic) flowing through the load; and - control means that are connected to the measurement means and that deliver a control signal (Vcom, Ib) to act on the opening and the closing of the electrical switching means (2A, 2B) according to the value of the main electric current (Ic) flowing through the load, characterized in that: - the first switching means includes a first, bipolar transistor that is connected in series with a second, field-effect transistor, the emitter of the first, bipolar transistor being linked to the drain of the second, field-effect transistor; - the control means are connected: - to the base of the first, bipolar transistor to deliver a regulated control current (Ib) thereto; - to the gate of the second, field-effect transistor to deliver a control voltage Vcom thereto; - the control means are suitable for delivering, to the base of the first, bipolar transistor, said regulated control current (Ib) that is dependent on a reference voltage (Vref), on the main electric current (Ic) and on a waste voltage (Vcs) that is measured between the collector of the first, bipolar transistor and the source of the second, MOS field-effect transistor; and - the control means thus being connected to the first electrical switching means such that the conduction state of said first switching means depends both on the regulated control current (Ib) and on the control voltage (Vcom) that are delivered by said control means. - at least two electrical switching means (2A, 2B) that are connected in parallel, the two switching means being based on different technology; - measurement means that are intended to measure a voltage across the terminals of the electrical switching means 2A, 2B and a main current (Ic) flowing through the load; and - control means that are connected to the measurement means and that deliver a control signal (Vcom, Ib) to act on the opening and the closing of the electrical switching means (2A, 2B) according to the value of the main electric current (Ic) flowing through the load, - the first switching means includes a first, bipolar transistor that is connected in series with a second, field-effect transistor, the emitter of the first, bipolar transistor being linked to the drain of the second, field-effect transistor; - the control means are connected: - to the base of the first, bipolar transistor to deliver a regulated control current (Ib) thereto; - to the gate of the second, field-effect transistor to deliver a control voltage Vcom thereto; - to the base of the first, bipolar transistor to deliver a regulated control current (Ib) thereto; - to the gate of the second, field-effect transistor to deliver a control voltage Vcom thereto; - the control means are suitable for delivering, to the base of the first, bipolar transistor, said regulated control current (Ib) that is dependent on a reference voltage (Vref), on the main electric current (Ic) and on a waste voltage (Vcs) that is measured between the collector of the first, bipolar transistor and the source of the second, MOS field-effect transistor; and - the control means thus being connected to the first electrical switching means such that the conduction state of said first switching means depends both on the regulated control current (Ib) and on the control voltage (Vcom) that are delivered by said control means.