TDK used its strength of being the first manufacturer in the world to commercialize ferrite, and developed a high performance ferrite material best suited for products. We are developing current sensor that utilize this characteristics to its fullest potential. To respond to the needs for high current along with the growth of Energy Management System market such as Industry 4.0, alternating current sensors with 30A to 600A capability are included in the line-up. Its one-touch clamp makes installation to existing electrical power equipment convenient, and the high voltage at open state is suppressed by its internal opening protection element. Stable high quality supply is made possible by automating the construction methods such as winding, soldering, etc.