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是短路電流的大峰值，開關隔離開關可以在不損壞的情況下閉合。當制造商未給出該值時，必須將其視為至少等于對應于Icw的峰值電流。由于不需要隔離開關來斷開短路電流，因此不可能定義斷開容量Icu[kA]。交流電和直流電的使用類別：定義使用條件的種類，使用兩個字母表示設備可能安裝的電路類型（交流為交流電，直流為直流電），兩位數(shù)表示必須操作的負載類型，另加一個字母（a或B），表示使用中的頻率。根據(jù)使用類別，產(chǎn)品標準定義了隔離開關在異常條件下必須能夠斷開和閉合的電流值。
is the maximum peak value of a short-circuit current which the switch disconnector can close without damages. When this value is not given by the manufacturer it must be taken to be at least equal to the peak current corresponding to Icw. It is not possible to define a breaking capacity Icu [kA] since switch disconnectors are not required to break short-circuit currents • utilization categories with alternating current AC and with direct current DC: define the kind of the conditions of using which are represented by two letters to indicate the type of circuit in which the device may be installed (AC for alternating current and DC for direct current), with a two digit number for the type of load which must be operated, and an additional letter (A or B) which represents the frequency in the using. With reference to the utilization categories, the product standard defines the current values which the switch disconnector must be able to break and make under abnormal conditions.
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