What the 1.5 A rating means in a 32 VDC rail
The Littelfuse 0603SFP150F/32-2 is a 1.5 A board-mount fuse from the SFP series, housed in the 0603 (1608 Metric) surface-mount package. It is rated for 32 VDC continuous and can interrupt a fault current up to 50 A at that voltage — the 50 A breaking capacity covers most low-voltage DC rails in portable equipment, battery packs, and peripheral ports where the available short-circuit current stays under that ceiling.
Melting I²t and cold resistance — the coordination parameters
With a melting I²t of 0.11 A²s and a DC cold resistance of 0.101 Ohms, this fuse opens fast on a hard short but tolerates the inrush of a 100 µF capacitor charged from a 12 V rail — the energy let-through stays below the downstream silicon's I²t withstand.
Obsolete — sourcing through independent channels
Littelfuse lists the 0603SFP150F/32-2 as obsolete.