1. ABB Ltd.
2. Amran Inc.
3. CG Power & Industrial Solutions Ltd.
4. China XD Electric Co Ltd.
5. Delta Electronics Inc.
6. Eaton Corporation PLC
7. ELSCO Transformers
8. General Electric Company
9. HD Hyundai Electric Co. Ltd.
10. Hitachi Energy Ltd.
11. Honeywell International Inc.
12. Hubbell Incorporated
13. Hyosung Heavy Industries
14. Instrument Transformer Equipment Corporation
15. Instrument Transformers Limited
16. JiangSu HuaPeng Transformer Co. Ltd.
17. MGM Transformer Company
18. Mitsubishi Electric Corporation
19. Olsun Electrics Corporation
20. Pak Electron Limited
21. Pfiffner Group
22. RITZ Instrument Transformers GmbH
23. Schneider Electric SE
24. Siemens AG
25. TDK Corporation
26. Toshiba Energy Systems & Solutions Corporation
27. Weidmann Electrical Technology AG