JCASE® FHJ In-Line Cartridge Fuse Holders Littelfuse JCASE® FHJ In-Line Cartridge Fuse Holders are designed with current ratings from 20A to 40A or up to 60A, depending on the configuration. These fuse holders come with either 10AWG or 8AWG wire leads. The JCASE® FHJ in-line fuse holders also come with or without a cover, which offers added protection in harsh environments. These fuse holders feature a black TPV housing with a UL 94V-0 flammability rating, and the tin-plated copper alloy contacts help ensure reliable connections. Typical applications include accessory circuits and overflow circuits.