Low-voltage fixed switch facility is applicable to the distributing systems with an alternating frequency of 50Hz, a rated working voltage of 380V and a rated working current of Xml: namespace prefix = st1 ns = "urn: schemas-microsoft-com: office: smarttags" />3, 150A used in the power plants, transformer substations and industrial enterprises. It is used for the purposes of power transformation, distribution and control of power, lighting and distributing equipment.