EI, CD and UI cut cores cover the small end of the magnetics world: control transformers, current transformers, chokes, inverter output reactors, and the magnetics inside EV charging modules. The laminations are punched or slit from 0.23–0.50 mm silicon steel, either grain-oriented for low loss or non-oriented where the flux reverses in every direction.
ZWILLIS keeps the common EI sizes from EI-28 to EI-200 and CD 16 to CD 50 in tooling, so standard sizes ship from stock. Burrs stay under control so windings are not scratched during assembly, and the stack can be supplied interleaved or butt-stacked to your design. For non-standard shapes, send the drawing — tooling and slitting services are in-house.