8 A fast-blow fuse for DC and AC rails
The Littelfuse 0451008.NRL is an 8 A fast-blow surface-mount fuse from the NANO² 451 series, rated for 125 V AC and 125 V DC with a breaking capacity of 50 A at rated voltage. The fast-blow response time clears overcurrents quickly, protecting downstream components like DC-DC converters or power input stages from short-circuit energy.
Melting I²t and cold resistance for inrush tolerance
With a melting I²t of 20.23, this fuse tolerates moderate inrush pulses without nuisance opening — suitable for capacitive input loads where the startup surge exceeds the steady-state 8 A rating. DC cold resistance is 0.0077 ohms, keeping voltage drop and I²R heating low in the normal operating path.
Surface-mount package and temperature range
Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, it mounts directly to the PCB — no through-hole or cartridge adaptor needed.
Approvals and compliance
Approved by CSA, PSE, and UL — the UL listing confirms the fuse's rating and breaking capacity are certified for North American panel and equipment use.