| 摘要 |
The present invention relates to a circuit arrangement for protection against impulse voltages of at least one unit to be supplied from a voltage network, having an input with a first and a second input connection to which it is possible to couple a voltage that is loaded with an impulse voltage and corresponds to the system voltage or has been derived from the system voltage, an output with a first and a second output connection to which the unit to be protected can be coupled, and a protective circuit that is coupled between the first and second input or output connection, the protective circuit having a limiting apparatus that is designed to limit the voltage present across it to a prescribable value, the protective circuit further comprising a switch apparatus (10) that comprises a switching element (10) and a drive circuit for the switching element (10), the switching element (10) being designed as a semi-conductor component, and the switch apparatus (10) being arranged in series with the limiting apparatus (12) and being designed to switch on given a prescribable first trigger criterion, and to switch off given a prescribable second trigger criterion. |
