Our Certificates

About Us

Kohsel is a Scandinavian supplier of customized transformer solutions for customers all over the world. Our mission is to unleash your full potential in transformer design. We are headquartered in Denmark and have our own business and production sites across Europe and Asia. With +500 employees and 50 years of experience, we deliver high-quality transformers with built-in know-how.

Our Process


We always quote based on your requirements, EAU, MOQ, etc.
In this phase, we are critical, ask questions and suggest alternative solutions and materials.


We specify your transformer and contra-specify your specification with regard to UL, EN, etc. We also prepare 3D modeling on request and determine vacuum potting, varnish, etc.


Upon approval of quotation and specification, we put forward prototypes and prepare test result documents for First Article Inspection.

1 - 2 Weeks
3-4 Weeks


When you have tested your prototype, we adjust and clear your final specification and determine your optimum packaging solution etc.


We select production site, check alternative raw materials, prepare PPAP and Certificate of Compliance (COC), and test the manufacturing process in a 0-series.

Mass Production

We incorporate your forecast monitoring, delivery time, buffer min/max or VMI and manufacture the 1st series production.


We deliver much more than products on time. We use our know-how to understand and support our customers’ demands within everything we do. We develop total logistic, quality, and CSR solutions optimized for our customers’ needs.

Industry Solutions

Drive technology

Wind technology

Solar technology

Airport technology