断路器的选择，首先根据具体使用条件选择类别，再按电路的额定电流及对保护的要求来确定具体参数。例如当额定电流在630A以下，短路电流不太大，*塑壳式断路器。额定电流比较大，可以选用框架式断路器(ACB)，当然也可以用那些性能好的塑壳式断路器代替。对短路电流特别大的支路要注意断路器的限流能力能否满足要求。有漏电保护要求时，断路器须有此功能。选择断路器的一个重要原则是断路器的短路分断能力≥线路的预期短路电流，这个断路器的短路分断能力通常是指它的极限短路分断能力。无论A类或B类断路器，它们的额定运行短路分断能力Ics绝大多数是小于它的额定极限短路分断能力Icu的。即脱扣器能长期通过的电流，也就是脱扣器额定电流。但是，按线路预期短路电流的计算来选择断路器的分断能力，的线路预期短路电流的计算是一项相当耗时耗力的工作。因此有一些误差不很大而可以被接受的简捷计算方法，比如对于10/0.4KV电压等级的变压器，可以考虑高压侧的短路容量为无穷大（10KV侧的短路容量一般为200～400MVA甚至更大，因此按无穷大来考虑，其误差不足10%）。或变压器的阻抗电压UK表示变压器副边短接（路），当副边达到其额定电流时，原边电压为其额定电压的百分值。因此当原边电压为额定电压时，副边电流就是它的预期短路电流。这些计算均是变压器出线端短路时的电流值，这是*严重的短路事故。

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