断路器一般具有两个反映断路器短路分断能力的参数：额定极限短路分断能力Icu与额定运行短路分断能力Ics。额定极限短路分断能力(Icu)是指在一定的试验参数（电压、短路电流、功率因数）条件下，经一定的试验程序，能够接通、分断的短路电流，经此通断后，不再继续承载其额定电流的分断能力。其试验程序为O-t-CO。具体方法是：把线路的电流调整到预期的短路电流值(例如380V，50kA)，而试验按钮未合，被试断路器处于合闸位置，按下试验按钮，断路器通过50kA短路电流，断路器立即开断(O)，断路器应完好，且能再合闸。经间歇时间t后，此时线路仍处于热备状态，断路器再进行一次接通(C)和紧接着的开断(O)，(接通试验是考核断路器在峰值电流下的电动和热稳定性)。此程序即为CO。断路器能完全分断，则其极限短路分断能力合格（试检后要验证脱扣特性和工频耐压）。

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