规定了额定电压高于1000 V，小于等于72.5 kV的50 Hz和60 Hz交流系统上使用的喷射式熔断器（包括硼酸型熔断器、隔离开关熔断器和跌落式熔断器）的要求。根据火花产生、瞬态恢复电压能力和运行速度对保险丝进行分类。

Specifies requirements for expulsion fuses, including boric acid type, disconnector fuses, and drop-out fuses for use on 50 Hz and 60 Hz alternating current systems of rated voltages above 1000 V, up to and including 72.5 kV. Classifies fuses according to spark production, transient recovery voltage capability, and speed of operation.