Littelfuse 0251.250Mxl.
FUSE, PCB, 250mA, 125V, VERY FAST ACTING; Fuse Current:250mA; Voltage Rating VAC:125VAC; Product Range:PICO II Series; Voltage Rating VDC:125VDC; Blow Characteristic:Very Fast Acting; Fuse Case Style:Axial Leaded; Body Material:Epoxy