| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Cit Relay & Switch | USA | |
| 2 | AEI | USA | |
| 3 | Amperite Co. | USA | |
| 4 | Littelfuse Inc. | USA | |
| 5 | Truck-Lite Co. LLC | USA | |
| 6 | GAMA Electronics Inc. | USA | |
| 7 | Perfect Switch LLC | USA | |
| 8 | TE Connectivity | USA | |
| 9 | NTE Electronics Inc. | USA | |
| 10 | Velvac Inc. | USA | |
| 11 | American Zettler Inc. | USA | |
| 12 | HBcontrols Inc. | USA |
