人工转换 meaning in English

manual changeover

The voltage is manually regulated by non - load machine switch , which is apt to be burnt . as a result , frequent fixing is inevitable ; moreover , these methods of controlling cannot meet the needs of processing certain work pieces
电压调节通过人工转换无载分接开关机械触点实现，造成无载分接开关容易烧坏，维修频繁，并且温度波动大，有时不能满足某些工件的加工要求。