| Acksen Ltd | | Manufacturer of voltage loggers and voltage detectors for Electric Power Utilities and General Industry specializing in interruption loggers, voltage recorders, personal voltage alarms, non-contact voltage detection, live line (HV) detection, telemetry and magnetic field detection. |
| Acme Electric Corporation | | Manufacturers transformers for power distribution applications and custom batteries and battery controls for aerospace applications. (Nasdaq: ACEE). |
| Adhunik Power Systems Pvt. Ltd. | | Provides both monitoring systems and engineering services to utilities and major users customers offering power conditioning, lightning and surge protection. |
| AMES Impex Electicals Pvt. Ltd. | | Manufacture cast resin, dry type resin imp regnated transformers with a capacity of up to 3000 KVA with a voltage level of 35 KV and below. |
| Amptec Pty Ltd | | Maintain, rewind, overhaul and sell distribution type power transformers. |
| Applied Precision Ltd | | Research, development and production of measuring devices for the electricity distribution industry . Products include automated test equipment for electricity meters, power analyzers and coulometry . |
| Arteche Group | | Manufacturer of outdoor and indoor intrumentation transformers, relays and protection relays, and substation integrated pretoection control. Product catalogs in PDF. |
| Ashok Transformers Pvt. Ltd. | | Manufacturer of power and distribution station transformers, furnace and special purpose transformers up to 20 MVA. India. |
| Avator | | Manufacture products related to power transmission such as organic insulators for high-tension transmission and high voltage cables. Argentina. |
| AVO Power Services, Inc. | | Field service on power transformers and circuit breakers including testing, assembling, oil processing and leak repair. |
| Baco | | Manufacture of domestic and industrial switchgear. From France. |
| Bajeria Industries | | Manufacturers of HRC fuses up to a breaking capacity of 80 KA. From India. |
| Cam Tran Transformers | | Manufacturer and refurbish oil-filled distribution transformers for global utility/power corporations, and contractor/developers. |
| Cardinal Pumps | | Manufacturer of transformer oil valves, transfer oil pumps for transformers and re-manufactured pumps. |
| COMEM S.p.a. | | Manufacturer of epoxy resin components, accessories for oil insulated transformers, for distribution and power transformers. From Italy. |
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