4.5 A slow-blow in a 1206 footprint
The Littelfuse 1206SFS450F/32-2 is a 4.5 A surface-mount slow-blow fuse from the SFS series, rated for 32 VDC with a 50 A interrupting capacity at that voltage. The slow-blow characteristic means it tolerates brief inrush current pulses without nuisance opening — the 3.6 A²s melting I²t gives a quantitative handle on how much energy the element absorbs before clearing.
What the ratings mean for the board
Rated 4.5 A continuous at 32 VDC — the 50 A breaking capacity means it safely interrupts a fault current up to that level without rupturing the 1206 ceramic body, which is the key safety spec for a secondary-side DC rail fuse.
Obsolete — sourcing through surplus channels
The UL recognition carries over to any genuine Littelfuse stock, so the safety certification holds for the sourced part.