Eaton 1664192 is a modular fuse holder for NH 22 x 58 mm cylindrical fuses with a rated current of 125 A and rated voltage of 690 V. It is a 3-pole plus switched neutral device that mounts on DIN rail, occupies 8 modular spacings and offers a lockable disconnecting position for isolation during maintenance. The holder is intended for final distribution and motor circuits in commercial and industrial installations, providing IP20 finger-safe protection.