Fast-blow 1 A in a compact SMD footprint
The 0451001.NRL is a Littelfuse NANO² 451 series surface-mount fuse rated 1 A with a fast-blow response, suitable for protecting sensitive circuits where overcurrent must be cleared quickly without thermal inertia. Rated for 125 V AC and DC, this fuse provides consistent protection across both supply types, and its 50 A breaking capacity at rated voltage means it can safely interrupt a fault current up to that level without rupturing the package.
Melting I²t and temperature envelope
A melting I²t of 0.459 A²s gives the energy needed to open the fuse — useful for coordinating with downstream semiconductor protection or predicting inrush-handling capability.