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1 Protection and control devices Rated making capacity The rated making capacity of an equipment is a value of current, stated by the manufacturer, which the equipment can satisfactorily make under specified making conditions. Rated breaking capacity The rated breaking of an equipment is a value of current, stated by the manufacturer, which the equipment can satisfactorily break, under specified breaking conditions. Rated ultimate short-circuit breaking capacity (Icu ) The rated ultimate short-circuit breaking capacity of a circuit-breaker is the maximum short-circuit current value which the circuit-breaker can break twice (in accordance with the sequence O – t – CO), at the corresponding rated operational voltage. After the opening and closing sequence the circuit-breaker is not required to carry its rated current. Rated service short-circuit breaking capacity (Ics ) The rated service short-circuit breaking capacity of a circuit-breaker is the maximum short-circuit current value which the circuit-breaker can break three times in accordance with a sequence of opening and closing operations (O - t - CO - t – CO) at a defined rated operational voltage (Ue ) and at a defined power factor. After this sequence the circuit-breaker is required to carry its rated current. Rated short-time withstand current (Icw ) The rated short-time withstand current is the current that the circuit-breaker in the closed position can carry during a specified short time under prescribed conditions of use and behaviour; the circuit-breaker shall be able to carry this current during the associated short-time delay in order to ensure discrimination between the circuit-breakers in series. Rated short-circuit making capacity (Icm ) The rated short-circuit making capacity of an equipment is the value of shortcircuit making capacity assigned to that equipment by the manufacturer for the rated operational voltage, at rated frequency, and at a specified power-factor for ac.

1.保護和控制裝置
額定制造能力
設備的額定通電能力是電流值，由
制造商，設備可在規(guī)定的條件下令人滿意地制造
創(chuàng)造條件。
額定開斷能力
設備的額定分斷是制造商規(guī)定的電流值，在規(guī)定的分斷條件下，設備可以滿意地分斷
條件
額定極限短路開斷能力（Icu）
斷路器的額定極限短路開斷能力為
斷路器可分斷兩次的大短路電流值
（按照O–t–CO順序），在相應的額定功率下
工作電壓。在打開和關(guān)閉順序之后，斷路器
無需承載其額定電流。
額定工作短路開斷能力（Ics）
斷路器的額定工作短路開斷能力為
斷路器可根據(jù)分閘和合閘操作順序分斷三次的大短路電流值
（O-t-CO-t-CO）在規(guī)定的額定工作電壓（Ue）下
)在一個確定的時間
功率因數(shù)。在此順序之后，斷路器需要攜帶其
額定電流。
額定短時耐受電流（Icw）
額定短時耐受電流是斷路器所處的電流
關(guān)閉位置可在規(guī)定的短時間內(nèi)進行
使用條件和行為；斷路器應能承載此功能
相關(guān)短時延遲期間的電流，以確保區(qū)分
在串聯(lián)的斷路器之間。
額定短路接通容量（Icm）
設備的額定短路閉合能力是制造商為該設備分配的短路閉合能力值
額定工作電壓、額定頻率和指定功率因數(shù)
對于ac。