The Bulgin FX0380/BK is an inline fuse holder from Bulgin's standard fuse holder series, designed for 5x20mm cartridge fuses in 10A/250V circuits with screw terminal connections. It mounts inline within power distribution or circuit protection applications. Critical verification: confirm the lead wire length (0.00155in/0.0394mm) is sufficient for your panel layout, as this appears unusually short and may indicate a specification error requiring clarification with the manufacturer.