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It is suitable for distribution lines with AC 50Hz, rated voltage below 690V and rated current up to 4000A, which are used for infrequent connection, disconnection or Galvanic isolation. The product shell adopts a fully enclosed design of glass fiber reinforced unsaturated polyester resin, which has high dielectric properties, good flame retardancy, carbonization resistance, and impact resistance, good protective ability, and reliable operational safety. The operating mechanism adopts spring energy storage, instantaneous acceleration release, quick connection and disconnection of the circuit, without manual operation, greatly improving the arc extinguishing ability. The moving contact adopts a horizontal pull type double break point structure, which improves short-term tolerance and has a self-cleaning effect on the contact. The operating handle has a safety design, which allows three locks to lock the handle simultaneously in the disconnected position, reliably preventing misoperation and avoiding the risk of safety accidents. In addition, the high-end customization of this product (with anti mold, moisture, and salt spray functions)