高压交流开关 熔断器组合和熔断器 断路器组合

[中文适用范围]： 本标准适用于公共和工业配电系统的三极单元，这些单元是开关的功能组件，包括隔离开关和限流熔断器，因此能够中断： - 高达开关额定开断电流的任何负载电流； - 任何达到组合额定短路开断电流的过电流，由此启动自动中断。本标准适用于额定电压1kV以上52kV以下设计的组合，用于50Hz或60Hz的三相交流系统。 [外文原描述]： This standard applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches including switch-disconnectors and current-limiting fuses and thus able to interrupt: - any load current up to the rated breaking current of the switch; - any over-current up to the rated short-circuit breaking current of the combination by which automatic interruption is initiated. This standard applies to combinations designed with rated voltages above 1 kV and below 52 kV for use on three-phase alternating current systems of either 50 Hz or 60 Hz.