- Haefely, a division of Hipotronics, Inc.
- Hamby Young
- Hammer & Steel
- Han Chang Transformer
- Hangzhou Xiaoshan Shunhe Metal Hose Co., Ltd.
- Harger Lightning & Grounding
- Hastings Fiberglass
- Haverfield Aviation
- HBL America Inc.
- HD Electric Company
- HD Supply Utilities
- HDR
- HDW Electronics, Inc.
- Hebei Kanb Composite Material Co.,Ltd
- HEBEI TIANYE ELECTRICAL CO LTD
- Hebei Xinhua High Voltage Electrical Equipment Co., Ltd.
- HEDRICH Group Wilhelm Hedrich Vakuumanlagen GmbH & Co. KG
- Heinrich Georg GMBH
- Helical Line Products Company
- Helicopter Services Inc
- Helix Uniformed Ltd.
- Henan Machinery & Electric Import & Export Co., Ltd.
- Henan Pinki Electric Power Equipment Group Co.,Ltd
- Hengyi Electrical Co., Ltd.
- Henkels & McCoy, Inc.
- Hercules Industries
- Hi-Line Utility Supply
- HICO America
- Hidro-Jet Equipamentos Hidraulicos Ltda.
- High Voltage Partial Discharge, Ltd. (HVPD)
- High Voltage, Inc.
- HIGHVOLT, a division of REINHAUSEN
- HindlePower, Inc.
- HIOKI USA Corporation
- Hipotronics, Inc.
- Hitachi HVB, Inc.
- Home Automation, Inc.
- Hongwei Electric Group Co.,Ltd
- House Of Threads
- Howard Industries, Inc.
- Howard Lighting Division, a division of Howard Industries
- Howard Transformer Division, a division of Howard Industries
- Huayi Elec. Apparatus Group Co., Ltd.
- Hubbell Cable Accessories, a Division of Hubbell Power Systems
- Hubbell Enclosures, a Division of Hubbell Power Systems
- Hubbell Power Systems, Inc.
- Hubbell Switching, a Division of Hubbell Power Systems
- Hughes Brothers, Inc.
- Hunan Hualian Torch Porcelain Insulator & Electrical Apparatus Co., Ltd
- Huntsman Advanced Materials
- Huskie Tools, Inc.
- HV Diagnostics, Inc.
- HV TECHNOLOGIES, Inc.
- HVR Advanced Power Components, Inc.
- Hydratrek, Inc.
- Hydrodec North America, LLC
- Hyundai Heavy Industries Co., Ltd.
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