P60G - Low voltage limiter - 50800

New types of low-voltage surge arresters, Type 1 VLD-F, meet the requirements of ČSN EN 50122-1 ed. 2: 2011, designed to protect non-normally live metal parts of railway traction power supplies with direct or alternating voltage. They are used to effectively protect persons who may come into contact with these parts during a lightning strike or a catenary failure. The arrester has high internal resistance when the voltage applied is less than its specified rated value (UV DC), and conducts when this level is exceeded. In the event of a fault resulting from a connection between a live part of the catenary power supply and a conductive element inadvertently connected to the return circuit, the arrester protects against touch voltage because it conducts and causes the power supply to be disconnected. According to ČSN EN 50122-1 ed.2: 2011, this type of arrester is primarily recommended for connection between the protected part and the return line of a traction line or in the area of ​​a current collector, which may be in contact with a conductor or a damaged current collector; also - on supporting mast structures, which may be live following an insulation failure. When the applied voltage drops below a specified value of its rated level again, the arrester returns to a non-conductive state.