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.

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Description Datasheet Availability Pricing (EUR) 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 250VAC 3A .028ohms 443 NANO2
Datasheet
2,430In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,500

443 Surface Mount Fuses Time Delay / Slow Blow 3 A 250 VAC 125 VDC 50 A at 250 VAC, 100 A at 125 VDC 10.08 mm x 3.05 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 28 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.062A 5.56ohms 448 NANO2
Datasheet
Product Comments
1,385In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

448 Surface Mount Fuses Fast Blow 62 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 5.56 Ohms
Littelfuse Surface Mount Fuses 125VAC 0.2A 1.24ohms 448 NANO2
Datasheet
Product Comments
1,855In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

448 Surface Mount Fuses Fast Blow 200 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 1.24 Ohms
Littelfuse Surface Mount Fuses 125VAC 0.315A .7015ohms 448 NANO2
Datasheet
Product Comments
1,995In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

448 Surface Mount Fuses Fast Blow 315 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 701.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.5A .38ohms 448 NANO2
Datasheet
Product Comments
2,982In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

448 Surface Mount Fuses Fast Blow 500 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 380 mOhms
Littelfuse Surface Mount Fuses 125VAC 3A .02445ohms 448 NANO2
Datasheet
Product Comments
2,337In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

448 Surface Mount Fuses Fast Blow 3 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 24.45 mOhms
Littelfuse Surface Mount Fuses 65VAC 15A .00394ohms 448 NANO2
Datasheet
Product Comments
5,779In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

448 Surface Mount Fuses Fast Blow 15 A 65 VAC 85 VDC 50 A at 65 VAC, 200 A at 85 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 3.94 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.75A .408ohms 449 NANO2
Datasheet
Product Comments
1,399In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

449 Surface Mount Fuses Time Delay / Slow Blow 750 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 408 mOhms
Littelfuse Surface Mount Fuses 125VAC 1A .2516ohms 449 NANO2
Datasheet
Product Comments
4,391In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

449 Surface Mount Fuses Time Delay / Slow Blow 1 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 251.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 2A .0708ohms 449 NANO2
Datasheet
Product Comments
3,888In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

449 Surface Mount Fuses Time Delay / Slow Blow 2 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 70.8 mOhms
Littelfuse Surface Mount Fuses 125VAC 3A .0352ohms 449 NANO2
Datasheet
Product Comments
1,469In Stock
2,000Expected 27/03/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

449 Surface Mount Fuses Time Delay / Slow Blow 3 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 35.2 mOhms
Littelfuse Surface Mount Fuses 125VAC 5A .0171ohms 449 NANO2
Datasheet
Product Comments
3,485In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

449 Surface Mount Fuses Time Delay / Slow Blow 5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 17.1 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.08A 4.05ohms 451 NANO2
Datasheet
1,238In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 80 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 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
5,882In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 100 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 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
3,901In Stock
8,000On Order
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 125 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 78 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.16A 1.2157ohms 451 NANO2
Datasheet
1,044In Stock
1,000Expected 01/04/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 160 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 1.2157 Ohms
Littelfuse Surface Mount Fuses 125VAC 0.315A .3918ohms 451 NANO2
Datasheet
11,036In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 315 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 391.8 mOhms
Littelfuse Surface Mount Fuses 125VAC 0.5A .3046ohms 451 NANO2
Datasheet
2,391In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 5,000

451 Surface Mount Ceramic Fuses Fast Blow 500 mA 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 304.6 mOhms
Littelfuse Surface Mount Fuses 125VAC 1A .078ohms 451 NANO2
Datasheet
7,463In Stock
6,000Expected 28/05/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 1 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 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
21,797In Stock
21,000Expected 28/05/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 2 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 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
13,351In Stock
11,000Expected 15/06/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 3 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 22.7 mOhms
Littelfuse Surface Mount Fuses 125VAC 4A .016ohms 451 NANO2
Datasheet
6,908In Stock
6,000Expected 24/03/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 4 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 16 mOhms
Littelfuse Surface Mount Fuses 125VAC 5A .0125ohms 451 NANO2
Datasheet
30,151In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 12.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 5A .0125ohms 451 NANO2
Datasheet
2,199In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 5,000

451 Surface Mount Ceramic Fuses Fast Blow 5 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 300 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 12.5 mOhms
Littelfuse Surface Mount Fuses 125VAC 8A .0077ohms 451 NANO2
Datasheet
3,718In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

451 Surface Mount Ceramic Fuses Fast Blow 8 A 125 VAC 125 VDC 50 A at 125 VAC, 50 A at 125 VDC, 400 A at 32 VDC 6.1 mm x 2.69 mm - 55 C + 125 C Reel, Cut Tape, MouseReel 7.7 mOhms