A Word from our President

Kodensya provides maintenance services for electrical installations, installation and wiring works, and equipment manufacturing to fulfill our obligation to society—” Contribute to society by providing products and services for the safe and efficient use of electricity essential to industry and communities.” We began research on an inrush current limiter for transformers in 1998 and launched it on the market as the Inrush Limiter T1 in 2012. Since then, the Inrush Limiter has been well-received by electric power companies, major chemical manufacturers, power generation operators based on renewable energy, and more. The continued use of electronic equipment in telecommunications, healthcare, and manufacturing fields, as well as in our daily lives, calls for an uninterrupted supply of stable electricity. This backdrop places an increasingly high demand technology that corrects or prevents disorders caused by the inrush phenomenon with transformers. We genuinely believe that the Inrush Limiter T1 meets this demand, and look forward to its use in all facilities.

Our Business

Electric power supply

Maintenance, Design, and Service for Electric Power Supply Facilities

  • Inspection and maintenance of high and low voltage facilities
  • Inspection and maintenance of power generation stations and substations
  • Overhaul of high and low voltage motors and utility pole transformers
  • Testing of electric power supply equipment

Maintenance, Design, and Service for Instrumentation Equipment

  • Inspection, maintenance, testing, and adjustment of various flow meters.
  • Inspection, maintenance, testing, and adjustment of various adjustment valves and ball valves
  • Inspection, maintenance, testing, and adjustment of sensors, converters, etc.
  • Inspection, maintenance, testing, and calibration of monitoring equipment
  • On-site adjustment and testing of various industrial plants.
Electric power generation

Maintenance, Design, and Service for Electric Power Generation Facilities

  • Testing services for power generation stations and protective relays
  • Various works and maintenance
  • Repair and refurbish work, and inspections of hydroelectric facilities
  • On-site control circuit modifications

Design and Implementation for Electrical and Instrumentation Works

  • Electrical works for public buildings
  • Electrical works for water supply and sewage processing facilities
  • Installation of industrial-use solar power generation systems
  • Installation of street lighting equipment
  • Installation of traffic light equipment

Design, Manufacture, and Installation of Power Receiving and Distribution Panels

  • Design of electrical circuitry and chassis
  • Design of control circuitry
  • Fabrication and painting of chassis
  • Wiring, testing
Control system

Design and Development of Supervisory Control Systems and Software

  • Supervisory control system
  • Remote monitoring systems
  • Inspection processing support systems
  • Various industrial control software

Our Company

Business name Kodensya Co., Ltd.
Head office 222-1 Hamamachi, Nobeoka-shi, Miyazaki 882-0862, Japan
Established February 16, 1949
Representative Director Toshiyasu Kai
Paid in capital 21 million yen
Sales 6,060 million yen (year ending March 2022)
Employees 360 (period ending June 2022)


Miyazaki Branch
  • 2940-63 Aza-shimonoyama, Shimonaka, Sadowaracho, Miyazaki-shi, Miyazaki 880-0212, Japan
  • Phone: +81 985-62-7272 / Fax: +81 985-62-7273
Nichinan Office
  • 1120-19 Ooaza-hirano, Nichinan-shi, Miyazaki 887-0015, Japan
  • Phone: +81 987-24-0326 / Fax: +81 987-24-0609
Oita Office
  • 6-25 Kubarukita, Oita-shi, Oita 870-0324, Japan
  • Phone: +81 97-593-5012 / Fax: +81 97-593-5026
Oita Branch
  • 2-68 Misa 6-chome, Oita-shi, Oita 870-0108, Japan
  • Phone: +81 97-521-6190 / Fax: +81 97-522-2784
Fukuoka Sales Office
  • Office Parea Isoda II-B-1, 2-10-28 Isoda, Hakata-ku, Fukuoka-shi, Fukuoka 812-0881, Japan
  • Phone: +81 92-588-7080 / Fax: +81 92-588-7082
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