本标准规定了交流配电系统用高压（1000 V以上）熔断器和附件的规范。包括额定最大电压为170 kV的设备。本标准适用的设备如下: a） 熔断器（包括熔断器） b） 限流熔断器 c） 保险丝外壳包装中使用的项目a）和b） d） 与保险丝和保险丝隔离开关一起使用的保险丝支架 e） 通过在保险丝支架中使用可拆卸保险丝单元或开关片创建的隔离装置（保险丝隔离开关、隔离开关和隔离断路器） f） 与电容器单元、一组单元或电容器组一起使用的外部电容器熔断器的排除型、限流型和组合型。 g） 备用限流熔断器（“电机起动器熔断器”）与高压电机起动器一起使用 h） 仅与熔断器和熔断器隔离开关一起使用时的熔断器 i） a）至f）项具有整体负载中断方式 j） 附件，包括安装支架和开关杆（开关钩） 本标准也可用于与范围中所列设备类似的其他设备。

This standard establishes specifications for high-voltage (above 1000 V) fuses and accessories for use on ac electrical distribution systems. Devices with rated maximum voltages to 170 kV are covered. The devices to which this standard applies are as follows: a) Expulsion fuses (including fuse cutouts) b) Current-limiting fuses c) Items a) and b) used in fuse enclosure packages d) Fuse supports of the type intended for use with fuses and fuse disconnecting switches e) Disconnecting devices (fuse disconnecting switches, disconnecting switches, and disconnecting cutouts) created by the use of a removable fuse unit or switch blade in a fuse support f) Expulsion, current-limiting, and combination types of external capacitor fuses used with a capacitor unit, a group of units, or capacitor banks. g) Backup current-limiting fuses ("motor-starter fuses") used in conjunction with high-voltage motor starters h) Fuse links when used exclusively with expulsion fuses and fuse disconnecting switches i) Items a) through f) having integral load-break means j) Accessories including mounting brackets and switch stick (switch hooks) This standard may also be used for other devices that are similar to the devices listed in the scope.