Fuse holder for PT 1.2-6-80-20 U3 isp. (TU) Elektrofarfof 00000466

PT fuses are designed to protect power transformers, overhead, and cable lines in three-phase alternating current networks with a frequency of 50 Hz and a rated voltage of 6 kV. The PT fuse is used as a replaceable element for PKT high-voltage fuses. Functional purpose of the device: selective disconnection of the protected circuit when the permissible current exceeds the limit, including in short-circuit (SC) modes characterized by currents in the thousands of amperes. The principle of operation of the fuse is based on the current-limiting effect: when the fuse link melts, an arc discharge occurs, which is extinguished through the ionization of the plasma channel. The arc quenching process is implemented within the volume of quartz sand filling the internal cavity of the fuse. The PT fuse structurally includes the following elements: a porcelain insulating tube acting as the body; a fuse link located inside the tube; quartz sand filling the internal volume to ensure arc quenching; and two hermetically crimped bases providing mechanical fastening and electrical contact of the fuse in PKT fuse holders. Characteristics: Voltage class: 6 kV Diameter: 72 mm Length: 364 mm