Fuse Holders & Fuse Blocks Littelfuse Fuse Holders and Fuse Blocks provide optimal safety to electrical systems. These holders are available for automotive-style fuses, including MINI®, ATO®, MIDI®, MEGA®, JCASE®, and universal glass fuses. The fuse holders are available for in-line, bolt-down, panel-mount, and PCB applications. These fuse holders are designed to work with specific fuses. Therefore, electrical load requirements, the number of circuits, and mounting location must be considered while selecting the fuse and fuse holder. The fuse blocks are available for both high-amperage fuses, such as MEGA® and MIDI® and low-amperage fuses, such as ATO® and MINI®. These fuse holders and blocks are used in high-current and low-current applications.