T630mAL250V is a fuse that Digi-Key does not carry. It is rated for 630mA, 250V, and is a glass cartridge, 5x20mm package.
0218.630MXP is a fuse from Littelfuse that would work as a possible cross. Please refer to data sheet to confirm this fuse will work with your application.
If you are looking for an associated fuseholder for the fuse from Littelfuse, please see part number 03455LS2H.