What the 1 A / 63 V / 50 A breaking capacity means for your BOM
The 1206SFS100F/63-2 is a 1 A, 63 VDC rated slow-blow fuse in the Littelfuse SFS series, with a 50 A interrupting rating at the rated voltage. The 50 A breaking capacity means it can safely clear a fault current up to that level without rupturing the 1206 ceramic body — critical for DC bus protection where the available fault current from a capacitor bank can exceed the fuse's interrupt rating if undersized.
Slow-blow characteristic and I²t for inrush handling
Rated slow blow with a melting I²t of 0.11, this fuse tolerates the repetitive inrush pulses typical of DC-DC converter input circuits and capacitive loads — the thermal inertia of the fuse element lets short-duration surges pass without nuisance opening. The 0.36 Ohm DC cold resistance sets a baseline voltage drop of 360 mV at rated current, which matters for low-voltage rails where every millivolt of headroom counts.
UL recognition for regulatory acceptance
UL recognized — the approval covers the fuse's interrupting rating and time-current characteristic, which simplifies acceptance in UL 248-14 listed equipment without additional component-level testing.