四级机械/电气连锁切换开关 Four-level mechanical/electrical chain transfer switch 市电,发电,带载状态指示灯 Electricity, power generation, indicator light with loading conditions 自动/手动控制屏屏体经酸洗,磷化,喷塑处理 Automatic/manual-controlled panel screen through the treatment of pickling, phosphating and spraying. 预留足够空间方便输入电缆 Preserve sufficient space to facilitate the cable input.. 自动切换时间,不超过7秒(可调) Automatic switching time, no more than 7 seconds (adjustable)