SUN-EH Electric Co., Ltd.
Japanese electrical equipment manufacturer based in Kyoto, producing transformers, lighting and power-supply devices since 1971.
Last updated September 29, 2026
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Overview
SUN-EH Electric Co., Ltd. (サンエー電機株式会社) is a Japanese electrical equipment manufacturer headquartered in Minami-ku, Kyoto. The company traces its origins to 1969, when SUN-EH Electric Research (サンエー電研) was founded in the Karahashi area of Kyoto's Minami ward. It was reorganized as SUN-EH Electric Co., Ltd. in June 1971 with capital of 5 million yen, and a head-office factory was established in Nishikyogoku. Over the following decades the firm expanded its manufacturing footprint across Kyoto and Shiga prefectures, opened sales offices in Tokyo, Fukuoka and Nagoya, and steadily increased its capital to 70 million yen by 1985. The company manufactures electrical machinery and applied equipment, including small single-phase transformers, AC motor applied devices, wiring devices and light-source applied machinery and appliances. Its product range is grounded in power electronics and lighting technology, supported by in-house design, development and testing capabilities. SUN-EH operates a main headquarters and sales department in Kyoto, sales offices in Tokyo and Nagoya, and a production plant in Maizuru, Kyoto Prefecture. It also established a subsidiary in Taiwan in 2013, Taiwan San-Ye Lighting Co., Ltd., extending its reach into the Taiwanese lighting market. SUN-EH Electric is a privately held company with capital of 70 million yen and approximately 80 employees. It is led by Representative Director Minoru Makino. The company holds ISO 9001:2015 quality management and ISO 14001:2015 environmental management certifications, and maintains factory qualifications for the manufacture of AC motor applied equipment, small single-phase transformers, wiring devices and light-source applied machinery. It is a member of the Kyoto Industrial Association, the Kyoto Chamber of Commerce and Industry, and the Japan Lighting Manufacturers Association. With more than five decades of operation, SUN-EH Electric remains a specialized mid-sized manufacturer serving Japanese industry, combining traditional transformer and lighting manufacturing with modern design, evaluation and testing equipment. Its product development is supported by a range of in-house instruments including digital oscilloscopes, power meters, LED simulated electronic loads, corona discharge testers and 3D scanners, reflecting a focus on quality and reliability in electrical components.
History
SUN-EH Electric Co., Ltd. began as SUN-EH Electric Research (サンエー電研), founded in November 1969 in the Karahashi area of Minami-ku, Kyoto. In September 1970 the company established the Umezu factory. In June 1971 it was reorganized as SUN-EH Electric Co., Ltd. with capital of 5 million yen, and a head-office factory was built in Nishikyogoku. The company expanded its manufacturing base in July 1973 with a new factory in Moriyama, Shiga Prefecture, followed by a factory in Kuze, Minami-ku, Kyoto in May 1975. In December 1976 capital was increased to 10 million yen and head-office functions were moved to the Kuze factory. Further capital increases followed: to 15 million yen in April 1977, 31 million yen in February 1980, 39 million yen in June 1981, 45 million yen in April 1983, and 70 million yen in March 1985. In December 1984 the company opened its Tokyo sales office. In February 1991 it established the Maizuru factory, and in March 1991 opened a Fukuoka sales office. The Nagoya sales office was opened in January 1995. The company achieved ISO 9001 certification in December 1998 and ISO 14001 certification in March 2002. In November 2005 the Maizuru factory was expanded. In March 2013 SUN-EH established Taiwan San-Ye Lighting Co., Ltd. (台湾三曄照明股ｲ分有限公司) in Taiwan. In June 2023 the Tokyo sales office was relocated. Today SUN-EH Electric operates from its headquarters in Minami-ku, Kyoto, with sales offices in Tokyo and Nagoya and a production plant in Maizuru. The company holds capital of 70 million yen and employs approximately 80 people. It maintains ISO 9001:2015 and ISO 14001:2015 certifications and holds factory qualifications for the manufacture of AC motor applied equipment, small single-phase transformers, wiring devices and light-source applied machinery. It is a member of the Kyoto Industrial Association, the Kyoto Chamber of Commerce and Industry, and the Japan Lighting Manufacturers Association.
- 2023
Relocated the Tokyo sales office.
- 2013
Established Taiwan San-Ye Lighting Co., Ltd. in Taiwan.
- 2005
Expanded the Maizuru factory.
- 2002
Obtained ISO 14001 certification.
- 1998
Obtained ISO 9001 certification.
- 1995
Opened the Nagoya sales office.
- 1991
Established the Maizuru factory.
- 1991
Opened the Fukuoka sales office.
- 1985
Increased capital to 70 million yen.
- 1984
Opened the Tokyo sales office.
Products and positioning
Specialized Japanese manufacturer of transformers, power electronics and lighting equipment, emphasizing quality and environmental management.
Small single-phase transformers
Manufactured under factory qualification for small single-phase transformer production.
AC motor applied equipment
Manufactured under factory qualification for AC motor applied equipment.
Wiring devices
Manufactured under factory qualification for wiring device production.
Light-source applied machinery and appliances
Manufactured under factory qualification for light-source applied machinery and appliances.
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