小电流选线全称小电流接地选线装置，简称小电流。是一种电力行业使用的保护设备。该设备适用于3KV－66KV中性点不接地或中性点经电阻、消弧线圈接地系统的单相接地选线，用于电力系统的变电站、发电厂、水电站及化工、采油、冶金、煤炭、铁路等大型厂矿企业的供电系统，能够指示出发生单相接地故障的线路。

The small current selection line is called the small current grounding line selection device, for short, the small current. It is a kind of protection equipment used in the electric power industry. The device is applicable to 3KV 66KV neutral or neutral point through resistor, single-phase arc suppression coil grounding line selection, power supply system for large factories in power system substations, power plants, hydropower stations and chemical, oil, metallurgy, coal, railway, to indicate the the single-phase grounding fault line.