The 0456050.DRSD from Littelfuse Inc. is a 50 A fuse rated 125 VAC and 75 VDC for board mounting (cartridge style excluded), in a surface-mount 2-SMD square end block package.
The 0456040.DRSD from Littelfuse Inc. is a 40 A board-mount fuse rated 125 V AC and 75 V DC, in a 2-SMD square end block surface-mount package. Cartridge-style fuses are excluded.