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ABOUT

History

Choil Sungup Electric Co., Ltd. is a transformer specialist built on decades of focus—concentrating all human resources, capital, and technical capabilities on a single product line: industrial transformers. We have built a history of continuous growth and development.

~2025

An era of corporate leap driven by technological innovation and revenue growth.

    • Completed development of AT Autotransformer
    • Achieved record-high sales of 38.7 billion KRW
    • Achieved sales of 34.7 billion KRW
    • Celebrated 50th Anniversary of Joil Electric Co.
    • First delivery of Seismic-Resistant Molded Transformer (1250kVA)
    • Acquired Patent for Molded Transformer Safe Against Harmonics
    • Selected as KEPCO Trusted Partner (Korea Electric Power Corporation Co-Growth Partner)

~2020

A period of strengthening technological competitiveness based on patents and corporate certification

    • Obtained Electrical Construction Registration Certificate
    • Acquired Patent for Seismic-Resistant High-Efficiency Molded Transformer
    • Recognized as a Small but Strong Enterprise (by Ministry of Employment and Labor)
    • Awarded Presidential Industrial Medal
    • Certified as a CLEAN Workplace

~2010

An era of establishing growth foundations and corporate credibility through technology development

    • Recognized as an INNO-BIZ (Technology Innovation-type SME)
    • Completed development of Molded Transformer
    • Selected as Excellent Technology Enterprise (by Korea Technology Credit Guarantee Fund)
    • Obtained UL Certification
    • CEO awarded Commendation by the Minister of Commerce, Industry and Energy
    • Received Encouragement Award at the Gyeonggi-do Quality Management Convention
    • Designated as a Promising Export SME
    • Selected as a Promising Power Venture Enterprise
    • Obtained ISO 14001 Certification
    • Relocated Head Office to Shihwa Industrial Complex, Siheung, Gyeonggi-do (Unit 2-Na-301)

~2000

A period of proving quality competitiveness through various certifications and awards.

    • Certified as a Venture Enterprise
    • Registered as a cooperative supplier of electrical equipment to the Electrical Contractors’ Mutual Aid Association
    • Won Bronze Prize at the National Quality Circle Competition
    • Approved for Group Standard Quality Certification (Power Transformers under 3MVA)
    • Won Gold Prize at the National Quality Circle Competition
    • President & CEO awarded Presidential Commendation (Contributor to 1997 Quality Management Convention)
    • Won Bronze Prize at the 1997 National Quality Circle Competition
    • Obtained ISO 9001 Certification
    • Received Encouragement Award at the 1996 Electrical Quality Circle Competition
    • Approved for Group Standard Quality Certification
    • Head Office relocated to Cheongpa-dong 3-ga, Yongsan-gu, Seoul
    • Obtained ISO 9002 Certification
    • Won Silver Prize at the 1994 National Quality Circle Competition
    • Established Corporate Research Institute
    • Factory Quality Control rated First Class (B-ra 1-668)
    • Won Bronze Prize at the 1993 National Quality Circle Competition
    • Exempted from Authorized Certification Test (Laminated Core Transformer)
    • Constructed and relocated new factory to Shihwa Industrial Complex, Siheung, Gyeonggi-do
    • Developed Automatic Sectional Recloser
    • Won Excellence Award at the 1993 Electrical Quality Circle Competition
    • Exempted from Authorized Certification Test (Round Core Transformer)

~1990

A period of strengthening the corporate foundation through quality certification and production base

    • Selected as a Promising Small and Medium Enterprise
    • Started supplying transformers to Korea Electric Power Corporation (KEPCO) and the Public Procurement Service Joined as a regular member of the Korean Standards Association
    • Joined as a regular member of the Korean Standards Association
    • Obtained KS Mark Certification (No. 4337) for pole-mounted transformers with single-point grounding
    • Relocated to newly built factory in Hyo-seong-dong, Buk-gu, Incheon
    • Joined the Korea Electric Industry Cooperative
    • Company name changed to Joil Electric Co., Ltd. and relocated factory to Munbae-dong, Yongsan-gu, Seoul
    • Founded Joil Electric Industrial Company in Ipjeong-dong, Jung-gu, Seoul