PRZK power source switches are built on the basis of RSI disconnectors, therefore they have all the features of these disconnectors. PRZK switches are a structural connection, with one common cover, of two RSI type switch disconnectors. This solution ensures excellent rigidity of the system, and thus, operational reliability and safety of use. PRZK switches equipped with a specially designed coupler are a comprehensive solution to the need to switch types of power supply, e.g. Network - Aggregate type.