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Medium Voltage Vacuum Load Switch Fn12-12 12kv 630A Indoor Type Used in Box Substation Power Distribution Network. Adopts high-performance vacuum interrupter, stable arc-extinguishing performance, long service life and low maintenance cost. Integrated three-pole compact structure, support spring energy storage manual & electric dual operation, equipped with built-in earthing switch for safe maintenance. 12kV rated voltage, 630A rated current, widely matched with ring main unit and box-type substation, fully meet medium voltage distribution network requirements.