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.
额定电流值指直流重叠允许电流或温度上升允许电流均可满足的直流电流值。
The rated current is the DC current value that satisfies both of DC saturation current value and temperature rise current value.
直流开关电源整流模块效率与输出电流存在直接相关性，目前电源正常工作时模块输出电流远低于额定电流，处于低效率区间。
Efficiency of rectifier module has relationship with its output current. Power supply works in low efficiency condition because output current below rated current far away.
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