NANO Fuses

Littelfuse NANO® Fuses are fast-acting, high-performance fuses available in a wide range of available current ratings. The portfolio includes 448 NANO2® SMF Fuses, which are fast-acting fuses available in current ratings from 62mA to 15A. The 443 NANO2 series features square surface-mount, time-lag devices with a 250VAC voltage rating. Littelfuse 449 NANO2 Slo-Blo® Fuses offer enhanced inrush withstand characteristics over NANO2 Fast-Acting Fuses. The 456 series is designed to support higher current requirements and is fully compatible with lead-free solder alloys. Littelfuse 456 fuses are ideal for storage system powers, cooling fan systems for PC servers, and base station power supplies. Littelfuse NANO Fuses include additional series as well.

Results: 230
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Qty. RoHS ECAD Model Series
Product
Fuse Type
Current Rating
Voltage Rating AC
Voltage Rating DC
Interrupt Rating
Fuse Size/Group
Minimum Operating Temperature
Maximum Operating Temperature
Packaging
Resistance
Littelfuse Surface Mount Fuses 125VAC 2.5A .04ohms 449 NANO2
Datasheet
Product Comments
1 298In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

449 Surface Mount Fuses Time Delay / Slow Blow 2.5 A 125 VAC 125 VDC 50 A, 50 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 40 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.08A 4.05ohms 451 NANO2
Datasheet
536In Stock
1 000Expected 04/11/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 80 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 4.05 Ohms
Littelfuse Surface Mount Fuses 125VAC 0.1A 3.1ohms 451 NANO2
Datasheet
2 271In Stock
3 000Expected 05/11/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 100 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 3.1 Ohms
Littelfuse Surface Mount Fuses 125VAC 0.125A 1.7ohms 451 NANO2
Datasheet
9 740In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 125 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 78 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.2A .8372ohms 451 NANO2
Datasheet
2 400In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 200 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 837.2 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.25A .5765ohms 451 NANO2
Datasheet
5 294In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 5 000

451 Surface Mount Ceramic Fuses Fast Blow 250 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 576.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.5A .3046ohms 451 NANO2
Datasheet
9 886In Stock
19 000On Order
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 500 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 304.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.5A .3046ohms 451 NANO2
Datasheet
1 664In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 5 000

451 Surface Mount Ceramic Fuses Fast Blow 500 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 304.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.75A .1444ohms 451 NANO2
Datasheet
6 004In Stock
6 000Expected 29/10/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 750 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 144.4 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.8A .1355ohms 451 NANO2
Datasheet
2 123In Stock
2 000Expected 14/09/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 800 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 135.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 1A .078ohms 451 NANO2
Datasheet
15 700In Stock
17 000Expected 22/10/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 1 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 78 mOhms
Littelfuse Surface Mount Fuses 125VAC 1A .078ohms 451 NANO2
Datasheet
4 020In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 5 000

451 Surface Mount Ceramic Fuses Fast Blow 1 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 78 mOhms
Littelfuse Surface Mount Fuses 125VAC 2A .0367ohms 451 NANO2
Datasheet
4 402In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 5 000

451 Surface Mount Ceramic Fuses Fast Blow 2 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 36.7 mOhms
Littelfuse Surface Mount Fuses 125VAC 3A .0227ohms 451 NANO2
Datasheet
17 622In Stock
16 000Expected 29/09/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 3 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 22.7 mOhms
Littelfuse Surface Mount Fuses 125VAC 5A .0125ohms 451 NANO2
Datasheet
1 809In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 5 000

451 Surface Mount Ceramic Fuses Fast Blow 5 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 12.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 7A .009ohms 451 NANO2
Datasheet
19 074In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 7 A 125 VAC 125 VDC 50 A, 50 A, 400 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 9 mOhms
Littelfuse Surface Mount Fuses 125VAC 8A .0077ohms 451 NANO2
Datasheet
9 617In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 8 A 125 VAC 125 VDC 50 A, 50 A, 400 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 7.7 mOhms
Littelfuse Surface Mount Fuses 125VAC 1.5A .063ohms 451 NANO2
Datasheet
26 807In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 1.5 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 63 mOhms
Littelfuse Surface Mount Fuses 65VAC 12A .0049ohms 451 NANO2
Datasheet
4 936In Stock
4 000Expected 14/09/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 12 A 65 VAC 65 VDC 100 A, 150 A, 400 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 4.9 mOhms
Littelfuse Surface Mount Fuses 125VAC 2.5A .0286ohms 451 NANO2
Datasheet
8 933In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 2.5 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 28.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 3.5A .02ohms 451 NANO2
Datasheet
1 537In Stock
3 000Expected 09/02/2027
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 3.5 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 20 mOhms
Littelfuse Surface Mount Fuses 125VAC 6.3A .0096ohms 451 NANO2
Datasheet
5 981In Stock
6 000Expected 11/01/2027
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 6.3 A 125 VAC 125 VDC 50 A, 50 A, 400 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 9.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 1.25A .078ohms 451 NANO2
Datasheet
3 749In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 1.25 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 78 mOhms
Littelfuse Surface Mount Fuses 125VAC 3.15A .0215ohms 451 NANO2
Datasheet
3 433In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

451 Surface Mount Ceramic Fuses Fast Blow 3.15 A 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 21.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.375A 1.2ohms 452 NANO2
Datasheet
1 224In Stock
8 000On Order
MouseReel Available
Min.: 1
Mult.: 1
: 1 000

452 Surface Mount Ceramic Fuses Time Delay / Slow Blow 375 mA 125 VAC 125 VDC 50 A, 50 A, 300 A 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 1.2 Ohms