Rated 4.5 A at 32 VDC with 35 A breaking capacity
The 0603SFV450F/32-2: This Littelfuse SFV series fuse is rated 4.5 A continuous at 32 VDC, with a DC cold resistance of 0.019 ohms — the voltage drop at rated current is under 90 mV, negligible in a low-voltage rail. Breaking capacity is 35 A at the rated voltage, meaning it safely interrupts fault currents up to that level without rupturing the 0603 ceramic body. Melting I²t of 1.68 A²s defines the energy to open the element — useful for coordinating with downstream components that must survive the let-through before the fuse clears.
Fast-blow response in a 0603 SMD footprint
Fast-blow characteristic means the fuse opens quickly on overcurrent — no intentional time delay, so it protects sensitive silicon before junction temperatures run away.
Obsolete — sourced through independent channels
UL recognition (approval agency UL) is retained on existing stock — the fuse carries the same safety certification as when it was in production.