The unique design of Littelfuses compact SLC series Class G fuses provide additional time-delay over competitive products which increases system reliability. Compact Class G fuses were the first fuse series to approach midget fuse dimensions and meet NEC requirements for branch-circuit protection. The unique dimensions of SLC series Class G fuses prevents insertion of lower voltage fuses in Class G fuse holders. The fuses varying length prevents insertion of higher ampere rated fuses in fuse holders designed for lower ampere ratings. Class CC fuses are replacing Class G fuses in many new designs. Class CC fuses superior time delay plus higher voltage and interrupting ratings meet the needs of modern circuits. Littelfuses introduction of POWR-PRO CCMR series fuses, with ratings up to 60 Amperes for providing branch circuit protection, are accelerating this trend.