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利用類別的特征詳見下表1。
交流電中要求高的類別是AC23A，對于AC23A
裝置必須能夠連接等于額定電流10倍的電流
裝置電流，以及斷開等于額定電流8倍的電流
設(shè)備電流。
從結(jié)構(gòu)角度來看，隔離開關(guān)是一種非常簡單的
裝置它沒有配備過電流檢測裝置和相應(yīng)的
電流自動(dòng)中斷。因此，隔離開關(guān)不能
用于自動(dòng)保護(hù)系統(tǒng)中可能出現(xiàn)的過電流
發(fā)生故障時(shí)，必須由協(xié)調(diào)斷路器提供保護(hù)。
這兩種裝置的組合允許在以下情況下使用隔離開關(guān)：
短路電流值大于定義隔離開關(guān)（后備保護(hù)）性能的電氣參數(shù)的系統(tǒng)
見第3.4章。這僅適用于Isomax和Tmax隔離開關(guān)。
對于Emax/MS空氣隔離開關(guān)，必須驗(yàn)證Icw的值
和Icm高于工廠和相應(yīng)的短路值
峰值。
The characteristics of the utilization categories are detailed in Table 1 below. The most demanding category in alternating current is AC23A, for which the device must be capable of connecting a current equal to 10 times the rated current of the device, and of disconnecting a current equal to 8 times the rated current of the device. From the point of view of construction, the switch disconnector is a very simple device. It is not fitted with devices for overcurrent detection and the consequent automatic interruption of the current. Therefore the switch disconnector cannot be used for automatic protection against overcurrent which may occur in the case of failure, protection must be provided by a coordinated circuit-breaker. The combination of the two devices allows the use of switch disconnectors in systems in which the short-circuit current value is greater than the electrical parameters which define the performance of the disconnector (back-up protection see Chapter 3.4. This is valid only for Isomax and Tmax switch-disconnectors. For the Emax/MS air disconnectors, it must be verified that the values for Icw and Icm are higher to the values for short-circuit in the plant and correspondent peak, respectively.
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