Active production — 1 A fast-blow in 1206
The F1206B1R00FSTR is a 1 A fast-blow surface-mount fuse from the Accu-Guard® II series, rated at 63 V DC with a breaking capacity of 50 A at rated voltage. It carries an active lifecycle status, so no end-of-life scramble for BOM lines that need this exact current and voltage rating.
Cold resistance and I²t — sizing for inrush
Melting I²t is 0.003 A²s, a low value that means this fuse opens fast on a short, but also means it may not survive a capacitor inrush if the peak energy exceeds that threshold. For a 1 A rail with moderate bulk capacitance, it is a clean fit.
Package and approvals — cUL, UL, 1206 footprint
Housed in a standard 1206 (3216 metric) package, 3.10 mm x 1.60 mm x 1.20 mm, surface-mount only. Approved by cUL and UL — the safety marks cover the 63 V DC / 50 A breaking capacity rating.