Abstract: An overvoltage arrester system for protecting an electrical installation from an overvoltage or impermissible amount of energy, includes a first metal oxide arrester in a first current path and a second metal oxide arrester in a second current path connected in parallel with the first current path. In order to ensure that the overvoltage arrester system is suitable for arresting especially high amounts of energy, in particular from pulsed energy inputs, while at the same time being especially fail-safe, in a current range, a characteristic voltage/current curve of the first metal oxide arrester has a lower voltage than a characteristic voltage/current curve of the second metal oxide arrester at the same current, and the first current path has a switch. An arrangement having an electrical installation and the overvoltage arrester system is also provided.

Abstract: An overvoltage arrester for high voltages having a high-voltage terminal that is connected to an arrester block forming a nonlinear resistor, and a temperature sensor for detecting the temperature of the arrester block. In order to enable a simple and reliable detection of the temperature of the arrester block continually during the operation thereof, the temperature sensor detects a change of the longitudinal extent of the arrester block.

Abstract: An overvoltage arrester for high voltages having a high-voltage terminal that is connected to an arrester block forming a nonlinear resistor, and a temperature sensor for detecting the temperature of the arrester block. In order to enable a simple and reliable detection of the temperature of the arrester block continually during the operation thereof, the temperature sensor detects a change of the longitudinal extent of the arrester block.

Abstract: An apparatus has power semiconductor modules, which are connected to one another via connection devices so as to form a series circuit. A short-circuiting device for short-circuiting the respective power semiconductor module is assigned to each power semiconductor module. The apparatus has a reliable and at the same time cost-effective short-circuiting device. It is proposed that the short-circuiting device is a pyrotechnical/mechanical element, which has a detonation charge and a tripping device, which can be displaced by the detonation charge.

Abstract: An apparatus has power semiconductor modules, which are connected to one another via connection devices so as to form a series circuit. A short-circuiting device for short-circuiting the respective power semiconductor module is assigned to each power semiconductor module. The apparatus has a reliable and at the same time cost-effective short-circuiting device. It is proposed that the short-circuiting device is a pyrotechnical/mechanical element, which has a detonation charge and a tripping device, which can be displaced by the detonation charge.