About Us We have 6 factories and more than 820 staff . As a professional , manufacturer of industrial automation products , we are constantly dedicated to sonant starter , frequency inverters , servomechanical motor and drive , EMI filters , harmonical wave AC chokes , sine wave filters and brake units and resistors . In the year of 2008 , EMHEATER Group does have established `` China EM Technology Limited"to cultivate oversea market .