1.Schneider (Thailand) Limited
2.Furukawa (Thailand) Co. Ltd.
3.Fuji Electric (Thailand) Co. Ltd.
4.Giantlok Engineering Co. Ltd.
5.ABB Electrification (Thailand) Co. Ltd
6.Honeywell Electronic Materials (Thailand) Co. Ltd.
7.Mitsubishi Electric Asia (Thailand) Co. Ltd.
8.Siemens Limited
9.Haco Electric (Thailand) Co. Ltd.
10.Sumitomo Electric Wintec (Thailand) Co. Ltd.