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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Description Datasheet Availability Pricing (USD) Filter the results in the table by unit price based on your quantity.
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 0.2A .8372ohms 451 NANO2
Datasheet
2,398In 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
5,194In 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
9,866In 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
6,484In Stock
6,000Expected 2026/10/29
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 2026/09/14
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
13,836In Stock
40,000On Order
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
17,360In Stock
16,000Expected 2026/09/29
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
1,794In 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
18,974In 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
26,607In 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
4,916In Stock
4,000Expected 2026/09/14
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 2026/08/27
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
5,846In Stock
6,000Expected 2027/01/11
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
3,699In 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
1,160In 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
Littelfuse Surface Mount Fuses 125VAC 0.375A 1.2ohms 452 NANO2
Datasheet
6,237In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 5,000

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
Littelfuse Surface Mount Fuses 125VAC 0.5A .7ohms 452 NANO2
Datasheet
9,698In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,000

452 Surface Mount Ceramic Fuses Time Delay / Slow 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 700 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.75A .36ohms 452 NANO2
Datasheet
1,834In Stock
6,000On Order
MouseReel Available
Min.: 1
Mult.: 1
: 1,000

452 Surface Mount Ceramic Fuses Time Delay / Slow 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 360 mOhms
Littelfuse Surface Mount Fuses 125VAC 1A .225ohms 452 NANO2
Datasheet
18,899In Stock
14,000Expected 2026/09/22
MouseReel Available
Min.: 1
Mult.: 1
: 1,000

452 Surface Mount Ceramic Fuses Time Delay / Slow 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 225 mOhms