The unique design of Littelfuse® 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 fuse's 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. Littelfuse® introduction of POWR-PRO® CCMR series fuses, with ratings upto 60 A for providing branch circuit protection are accelerating this trend.