DEVICE FOR DISCHARGING AN ELECTRICAL OVERVOLTAGE

摘要

A device (1) for discharging an electrical overvoltage includes an overvoltage discharge unit (10) having a non-linear current/voltage characteristic at least in sections. A first terminal electrode (16) of the overvoltage discharge unit (10) is connected to a high-voltage terminal (18) of the device (1). A second terminal electrode (22) of the overvoltage discharge unit (10) is connected to a low-voltage or ground terminal (24) of the device (1). The overvoltage discharge unit (10) is surrounded, at least in sections, by an insulating body (20). A cutting element (40) is connected to the low-voltage or ground terminal (24) and is disposed close to a high-voltage section of the overvoltage discharge unit (10). The cutting element cuts into the insulating body (20) when the insulating body (20) distends as a result of an electrical overload, enabling an are to be sparked and stabilized between the high-voltage section and the cutting element (40).