kht的甄选

热(过载)继电器:KH【Therml(over-load)relay】时间继电器(延时或无继电器):KT【Time-delayall-or-nothingrelay(timedelayrelay)】中间继电器:KM(常用符号，非国标)【(intermediaterelay)】电流继电器:KC【(currentrela...