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The main definitions regarding LV switchgear and controlgear are included in the international Standards IEC 60947-1, IEC 60947-2 and IEC 60947-3. Main characteristics Circuit-breaker A mechanical switching device, capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time and breaking currents under specified abnormal circuit conditions such as those of short-circuit. Current-limiting circuit-breaker A circuit-breaker with a break-time short enough to prevent the short-circuit current reaching its otherwise attainable peak value. Plug-in circuit-breaker A circuit-breaker which, in addition to its interrupting contacts, has a set of contacts which enable the circuit-breaker to be removed. Withdrawable circuit-breaker A circuit-breaker which, in addition to its interrupting contacts, has a set of isolating contacts which enable the circuit-breaker to be disconnected from the main circuit, in the withdrawn position, to achieve an isolating distance in accordance with specified requirements. Moulded-case circuit-breaker A circuit-breaker having a supporting housing of moulded insulating material forming an integral part of the circuit-breaker. Disconnector A mechanical switching device which, in the open position, complies with the requirements specified for the isolating function. Release A device, mechanically connected to a mechanical switching device, which releases the holding means and permits the opening or the closing of the switching device. 1

低壓開(kāi)關(guān)設(shè)備和控制設(shè)備的主要定義包含在
國(guó)際標(biāo)準(zhǔn)IEC 60947-1、IEC 60947-2和IEC 60947-3。
主要特征
斷路器
一種機(jī)械開(kāi)關(guān)裝置，能夠在正常電路條件下接通、承載和斷開(kāi)電流，并且能夠接通、承載指定的電流
特定異常電路條件下的時(shí)間和開(kāi)斷電流，如
就像那些短路。
限流斷路器
斷路器，其斷開(kāi)時(shí)間短到足以防止短路
電流達(dá)到本可達(dá)到的峰值。
插入式斷路器
一種斷路器，除了其斷開(kāi)觸點(diǎn)外，還具有一組
使斷路器能夠拆除的觸點(diǎn)。
抽出式斷路器
一種斷路器，除了其斷開(kāi)觸點(diǎn)外，還具有一組
使斷路器能夠與電源斷開(kāi)的隔離觸點(diǎn)
主電路處于抽出位置，以在中實(shí)現(xiàn)隔離距離
按照規(guī)定的要求。
塑殼斷路器
一種具有模制絕緣材料支撐外殼的斷路器
構(gòu)成斷路器不可分割的一部分。
隔離開(kāi)關(guān)
機(jī)械開(kāi)關(guān)裝置，其在打開(kāi)位置符合
隔離功能規(guī)定的要求。
釋放
與機(jī)械開(kāi)關(guān)裝置機(jī)械連接的裝置，其
釋放保持裝置，并允許打開(kāi)或關(guān)閉
開(kāi)關(guān)設(shè)備。
1.