Mersen Control Systems Fuses D fuse holder inset 623501 - Mersen 01658.050000, The Mersen 01658.050000 is a D fuse holder inset, suitable for DIII 50A fuses, supporting up to 500V. It is typically used in electrical circuits for protection against overcurrent. This product features pass screws for secure installation and is widely used in various industrial applications. Mersen 01658.050000 D Fuse Holder Inset DIII 50A 500V For DIAZED Fuses