6.3 A fast-blow in a 2-SMD footprint
The Littelfuse 045106.3NRL is a NANO²® 451 series fast-blow surface-mount fuse rated 6.3 A at 125 VAC and 125 VDC, with a breaking capacity of 50 A at rated voltage. The 9.17 melting I²t means it clears quickly on a hard short while surviving moderate inrush from a bypass capacitor or a small motor start.
Board-fit and thermal envelope
Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, the 045106.3NRL mounts on standard SMT pads with a tape-and-reel feed for automated assembly. The DC cold resistance of 0.0096 Ohms keeps voltage drop low in the 6.3 A path. The 50 A interrupting rating at 125 VDC is the figure that governs fault clearing in a DC power rail — confirm the available fault current at the fuse location stays below this ceiling.