Patent ID: 7557548

Claim:
A protective circuit for limiting a voltage or a current of a load comprising an input connection ( 8 ) to be connected to an input feeding line corning from a transmission network; a feedback resistor (R 3 ) connected to the drain (D) of the field effect transistor (Q 1 ) and the base of the bipolar transistor (Q 2 ) for controlling the properties of the protective circuit as an automatic controller, a feedback current reducing resistor (R 2 ) disposed between the source (S) of the field effect transistor (Q 1 ) and the base ( 2 ) of the bipolar transistor (Q 2 ) for reducing a feedback current that is fed back through the feedback resistor ( 1 ( 3 ) to the base ( 2 ) of the bipolar transistor (Q 2 ).