K331094F 125A Rail Mount Fuse Holder for 22 x 58mm Fuse, N, 690V ac. Mersen offer a comprehensive range of Modulostar fuse-holders. All of the fuse-holders offer finger-safe to IEC standards at IP20 protection , they also offer easy fuse changing. Suitable applications include protection for motors, transformers, low voltage distribution, control circuits and drive protection.