1)transfer switch type,转换开关型式2)transfer switch model number,转换开关型号3)hybrid transfer switch,混合式转换开关4)throw over switch,投掷式转换开关5)transfer switch,转换开关6)Switch,开关，转换
用法例句
In these years,a new type transfer switch has been put forward a hybrid transfer switch which combines the solid state switches and the mechanical switches.
