5 A fast-blow SMT fuse for board-level protection
The Littelfuse 0451005.NRL is a 5 A fast-blow surface-mount fuse from the NANO²® 451 series, rated for 125 V AC and DC with a 50 A interrupting capacity at rated voltage. Housed in a compact 2-SMD square end block package (6.10 mm x 2.69 mm x 2.69 mm), it is designed for automated pick-and-place assembly on densely populated PCBs.
Breaking capacity and let-through energy for coordination
With a 50 A breaking capacity at 125 V, this fuse safely interrupts overcurrents up to that level — adequate for secondary-side DC rail faults in most power supplies and battery circuits. A melting I²t of 5.566 provides the let-through energy figure needed for selectivity studies and to ensure downstream components are not stressed beyond their surge ratings.
Active lifecycle and compliance coverage
Approvals from CSA, PSE, and UR cover North American and Japanese regulatory requirements — a compliance short-cut for OEMs shipping finished goods into those markets.