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external isolation switch

An outdoor switch-disconnector (colloquially a “knife switch”) is high-voltage electrical equipment installed on utility poles, towers, or outdoor substation areas. Its main function is to safely disconnect or connect a circuit when voltage is present,...

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An outdoor switch-disconnector (colloquially a “knife switch”) is high-voltage electrical equipment installed on utility poles, towers, or outdoor substation areas. Its primary function is to safely disconnect or reconnect a circuit when voltage is present but no current load is present, providing a clearly visible air insulation break for servicing lines, transformers and other equipment. This is a key device for safe operation of the electrical system.

This product is highly adaptable to environmental conditions. Its high-strength porcelain insulator can withstand long-term exposure to sunlight, rain, dirt and icing, providing reliable insulation support. The conductive part (such as blades and contacts) is most often made of a corrosion-resistant copper alloy or silver-plated to ensure good contact. Control methods usually include using a hook or lever mechanism for manual or power operation, which is safe and convenient.

The external switch-disconnector has sufficient dynamic and thermal stability and is capable of withstanding short-term short-circuit currents. A clearly visible opening point after operation is a mandatory safety measure according to the requirements of electrical safety regulations. Thanks to its robust design, reliable insulation, ease of operation and high adaptability to the environment, it has become an indispensable isolating device in power transmission and distribution networks.

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