Low - voltage switchgear and controlgear - part 3 : switches , disconnectors , switch - disconnectors and fuse - combination units 低压转换开关装置和控制装置.第3部分:转换开关断路器开关断路器和保险丝组合装置
Low - voltage switchgear and controlgear - part 5 - 10 : contactor relays and auxiliary contact for contactors and motor - starters 低压转换开关装置和控制装置.第5 - 10部分:接触器和马达起动器的接触继电气和辅助触点
Post insulators for switchgears and substation with nominal voltages greater than 1000 v ; co - ordination of the definitions for mechanical bending strength 公称电压1kv以上转换开关设备和变电站用柱形绝缘子
Openings in front covers of ducting and trunking for use with switches , socket - outlets and other accessories to be mounted into mounting boxes ; main dimensions 与转换开关插座出口接线和准备安装到安装盒里的其
Low - voltage switchgear and controlgear - part 6 : multiple function equipment - section 1 : automatic transfer switching equipment ; amendment 2 低压开关和控制装置.第6部分:多功能设备.第1节:自动转换开关设备.修改件1
Low - voltage switchgear and controlgear - part 6 : multiple function equipment - section 1 : automatic transfer switching equipment ; amendment 1 低压开关设备和控制设备.第6部分:多功能设备.第1节:自动转换开关设备.修改件1
An automatic transfer switch monitors the condition of the sources and connects the load to the alternate source if the preferred source fails 自动转换开关能够进行监控，如果首选电源供应失败，就自动把负载连接到备用电源。
