熔断器选择必须依据其使用条件来进行，主要有系统电压、额定电流、短路容量、保护配合等。
Selection of fuses must be carried out according to their use conditions, mainly they are system voltage, rated current, short circuit capacity, protection suitability etc.
概述了在轨道交通系统中选用直流熔断器的目的及选用方法，包括额定电压、额定电流的选择，与断路器的配合工作。
The object of using DC fuse in tunnels and way of selection were expounded, including the selection of rated voltage and current, and the coordination of circuit breakers.
当通过熔断器的电流为其额定电流的2倍时， 1小时内熔断；
When the current through the fuse is 2 times of its specined electric current, fusing in an hour;
当通过熔断器的电流为其额定电流的2倍时， 1小时内熔断；
When the current through the fuse is 2 times of its specined electric current, fusing in an hour;
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