10A fast-blow SMD fuse for board-level protection
The Littelfuse 0451010.NRL is a 10 A fast-blow SMD fuse from the NANO²® 451 series, rated for 125 V AC and 125 V DC. Its fast-blow response clears overcurrents quickly, protecting sensitive downstream components on a PCB. Breaking capacity reaches 35 A AC and 50 A DC at rated voltage, meaning the fuse can safely interrupt a fault up to those levels without rupturing — critical for DC rails where arcs sustain longer.
Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, this fuse is designed for surface-mount assembly. The compact footprint suits dense PCB layouts where through-hole fuses would consume too much real estate. Available on Tape & Reel or Cut Tape, it integrates into standard pick-and-place lines. The DC cold resistance of 0.0056 Ohms keeps voltage drop low in the 10 A path.
Temperature range and approvals
Approvals from CSA, PSE, and UL provide acceptance in North American and Asian markets. The melting I²t of 26.46 A²s gives a measure of the energy needed to open the fuse — useful for coordinating with upstream protection and ensuring the fuse does not nuisance-blow on inrush.