When building photovoltaic systems it is necessary to meet adequate security demands to ensure their safe operation and maintenance. Due to environmental influences the components of photovoltaic systems are exposed to numerous damages on the side of a direct as well as alternating circuit. In such cases a fast and safe disconnection of the photovoltaic system is crucial.
In the thesis I present an overview of the existing solutions of the switches. In the introduction I describe the components of the direct circuit and the dangers that can occur when the photovoltaic system is in operation. The main part of the thesis is focused on the description of the arc, its detection and the methods of its extinction.