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是一個機械
當處于打開位置時，執(zhí)行斷開操作的開關(guān)裝置
功能，并確保隔離距離（觸點之間的距離）足以保證安全。必須保證這種斷開的安全性，并且
通過正向操作驗證：操縱桿必須始終指示
設(shè)備移動觸點的實際位置。
機械開關(guān)裝置必須能夠接通、攜帶和斷開電流
在正常電路條件下，包括正常服務(wù)中的任何過載電流，
并在規(guī)定的時間內(nèi)，在異常電路條件下承載電流，
例如，短路條件。
隔離開關(guān)通常用于：
•主配電盤裝置；
•線路、母線或負荷裝置的開關(guān)和斷開裝置；
•總線連接。
隔離開關(guān)應(yīng)確保整個裝置或其部分不受影響
帶電、安全地斷開與任何電源的連接。這種開關(guān)的使用
例如，隔離開關(guān)允許人員在工廠上執(zhí)行工作
沒有電氣性質(zhì)的風險。
即使不禁止并排使用單極裝置
標準建議使用多極裝置，以保證
同時隔離電路中的所有極。
隔離開關(guān)的特定額定特性由
標準IEC 60947-3，詳情如下：
•Icw[kA]：額定短時耐受電流：
是指開關(guān)能夠在沒有損壞的情況下在
特定持續(xù)時間的關(guān)閉位置
is a mechanical switching device which, when in the open position, carries out a disconnecting function and ensures an isolating distance (distance between contacts) sufficient to guarantee safety. This safety of disconnection must be guaranteed and verified by the positive operation: the operating lever must always indicate the actual position of the mobile contacts of the device. The mechanical switching device must be able to make, carry and break currents in normal circuit conditions, including any overload currents in normal service, and to carry, for a specified duration, currents in abnormal circuit conditions, such as, for example, short-circuit conditions. Switch disconnectors are often used as: • main sub-switchboard devices; • switching and disconnecting devices for lines, busbars or load units; • bus-tie. The switch disconnector shall ensure that the whole plant or part of it is not live, safely disconnecting from any electrical supply. The use of such a switch disconnector allows, for example, personnel to carry out work on the plant without risks of electrical nature. Even if the use of a single pole devices side by side is not forbidden, the standards recommend the use of multi-pole devices so as to guarantee the simultaneous isolation of all poles in the circuit. The specific rated characteristics of switch disconnectors are defined by the standard IEC 60947-3, as detailed below: • Icw [kA]: rated short-time withstand current: is the current that a switch is capable of carrying, without damage, in the closed position for a specific duration
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