HR5系列熔断器式隔离开关，额定电压至交流380V，额定电流至  630A，适用于有高（gāo）短路电流的配电电路和电动机电路中，作为手动不频（pín）繁操作的开关、隔离开关和应急开关，并作电路保（bǎo）护之用，但一般不适（shì）用直接开关单台电动机。

本系列开关由三极底座、带嵌入式灭弧罩的上插座、下插座和可拆卸的盖组成，盖兼作手柄（bǐng）并在其背面卡装熔断体。更换熔断体时可将盖  从底（dǐ）座上卸下，以防触及带电（diàn）部件。底座两侧的片状弹簧使开关具有快  速分、合（hé）功能（néng）。

Series HR5 fuse-switch-disconnector with rated voltage up to 50Hz  380V and rated current up to 630A is applicable to the distribution circuit  and motor circuits with high short-circuit currents as the power switch,  switch-disconnector and emergency switch for protection purpose  Generally it is not suitable for directly operating a single motor. HR5 fuse-  switch-disconnector is composed of a triple-pole base, upper socket set  with built-in arc chute, lower socket set and removable cover. The cover  also functions as a handle and the fuse-links are fitted to its back. When  replacing fuse-link, the cover can be removed from the base to avoid  touching to live parts. The sheet springs on both sides of the base equip the  switch with fast making breaking function.