The MARATHON/KULKA part R6J100A3B is a Class J fuse holder designed for heavy-duty electrical applications. This reinforced fuse holder features a 3-pole design with a maximum current rating of 100A and a voltage rating of 600V. It is compatible with 2/0 to #14 AWG copper or 2/0 to #12 AWG aluminum wire sizes. Made from high-quality phenolic material, this open-style fuse holder provides excellent durability and protection. Whether you need to replace a faulty fuse holder or want to upgrade your electrical system, the MARATHON/KULKA R6J100A3B is a reliable choice.