本标准规定了交流配电系统用高压（1000 V以上）熔断器、配电封闭单极空气开关、隔离断路器、熔断器隔离开关和附件的规范。包括额定最大电压为170 kV的设备。本标准适用的装置如下:a）配电和功率等级驱逐型熔断器b）配电和功率等级限流型熔断器c）配电和功率等级熔断器隔离开关d）在熔断器外壳包中使用的a）至c）e）拟与配电和功率等级熔断器一起使用的类型的熔断器支架，和熔断器隔离开关f）熔断器和隔离断路器g）通过在配电或功率级熔断器支架中使用可拆卸开关片创建的隔离装置h）配电级封闭单体- 极空气开关i）与电容器单元、单元组或电容器组一起使用的外部电容器熔断器的配电等级和功率等级、限流和组合类型。j） 当专门与配电级和功率级熔断器以及配电级和功率级熔断器隔离开关k）项目a）至d）和f）至i）一起使用时，熔断器应具有整体负载断路装置

This standard establishes specifications for high-voltage (above 1000 V) fuses, distribution enclosed single-pole air switches, disconnecting cutouts, fuse disconnecting switches, and accessories for use on ac distribution systems. Devices with rated maximum voltages to 170 kV are covered. The devices to which this standard applies are as follows: a) Distribution and power class expulsion type fuses b) Distribution and power class current-limiting type fuses c) Distribution and power class fuse disconnecting switches d) Item a) through item c) used in fuse enclosure packages e) Fuse supports of the type intended for use with distribution and power class fuses, and fuse disconnecting switches f) Fuse and disconnecting cutouts g) Disconnecting devices created by the use of a removable switch blade in a distribution or power class fuse support h) Distribution class enclosed single-pole air switches i) Distribution class and power class expulsion, current-limiting, and combination types of external capacitor fuses used with a capacitor unit, groups of units, or capacitor banks. j) Fuse links when used exclusively with distribution class and power class fuses, and distribution class and power class fuse disconnecting switches k) Items a) through d) and f) through i) having integral load-break means