描述：产品适用(yong)(yong)于50Hz、380V以(yi)下，直(zhi)流440V以(yi)下的电(dian)(dian)(dian)路中(zhong)(zhong)，在电(dian)(dian)(dian)气机(ji)械设(she)计阶段中(zhong)(zhong)作变更(geng)电(dian)(dian)(dian)流、电(dian)(dian)(dian)压(ya)和(he)作为(wei)代替未(wei)定阻值(zhi)的可变电(dian)(dian)(dian)阻器(qi)应用(yong)(yong)，在实(shi)验室(shi)中(zhong)(zhong)作研(yan)究试(shi)验或教(jiao)学演示用(yong)(yong)的电(dian)(dian)(dian)流、电(dian)(dian)(dian)压(ya)调节(jie)器(qi)，以(yi)及作为(wei)发电(dian)(dian)(dian)设(she)备和(he)直(zhi)流电(dian)(dian)(dian)动机(ji)的励磁、调速电(dian)(dian)(dian)阻等之用(yong)(yong)。