3 A fast-blow fuse for 63 VDC rails
The F1206B3R00FSTR is a 3 A surface-mount fuse from the KYOCERA AVX Accu-Guard® II series. Fast Blow response and a 63 VDC rating make it suited for protecting DC power inputs, I/O lines, and low-voltage bus rails where the load stays under 3 A continuous. Breaking capacity is 50 A at rated voltage — enough to handle most secondary-side fault currents in telecom and industrial control boards without the fuse rupturing.
Melting I²t and inrush tolerance
Melting I²t is 0.1 — a low value that means the fuse opens quickly on a hard short, but it also has minimal tolerance for capacitive inrush. If the downstream load has a high input capacitance, expect the fuse to open during power-up unless the inrush energy stays under the I²t limit. The 1206 package (3.10 mm x 1.60 mm x 1.20 mm) fits standard pick-and-place and reflow profiles. Operating temperature is -55°C to 125°C, covering industrial and some under-hood automotive zones without derating.
Active production — no last-time buy pressure
The part is in regular production, so BOM planning does not need a lifetime buy or a second-source scramble. Approval agency marks include cUL and UL, easing panel certification in North American equipment.