Fast-Acting High-Speed Fuses

Littelfuse Fast-Acting High-Speed Fuses are designed to protect equipment and systems. These fast-acting fuses feature Littelfuse-developed technology that sets standards for accuracy, consistent quality, reliability, and predictable performance. Littelfuse Fast-Acting High-Speed Fuses are optimized for performance and efficiency to better protect critical power semiconductors against short circuits.

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Qty. RoHS ECAD Model Series
Product
Body Style
Current Rating
Voltage Rating AC
Voltage Rating DC
Interrupt Rating
Mounting Style
Termination Style
Fuse Type
Fuse Size/Group
Indicator Style
Packaging
Littelfuse Specialty Fuses 125A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
4In Stock
Min.: 1
Mult.: 1

L25S Specialty Fuses Round Body Blade Fuses 125 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow 5AG Without Indicator Bulk
Littelfuse Specialty Fuses 15A 150VAC 150VDC FF L15S POWR-SPEED
Datasheet
5In Stock
Min.: 1
Mult.: 1
L15S Specialty Fuses Round Body Blade Fuses 15 A 150 VAC 150 VDC 20 kA at 100 VDC Stud Bolt Down Fast Blow 5AG Without Indicator Bulk
Littelfuse Specialty Fuses 30A 150VAC 150VDC FF L15S POWR-SPEED
Datasheet
10In Stock
Min.: 1
Mult.: 1
L15S Specialty Fuses Round Body Blade Fuses 30 A 150 VAC 150 VDC 20 kA at 100 VDC Stud Bolt Down Fast Blow 5AG Without Indicator Bulk
Littelfuse Specialty Fuses 350A 150VAC 100VDC FF L15S POWR-SPEED
Datasheet
3In Stock
Min.: 1
Mult.: 1
L15S Specialty Fuses Round Body Blade Fuses 350 A 150 VAC 100 VDC 20 kA at 100 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 500A 150VAC 100VDC FF L15S POWR-SPEED
Datasheet
1In Stock
Min.: 1
Mult.: 1
L15S Specialty Fuses Round Body Blade Fuses 500 A 150 VAC 100 VDC 20 kA at 100 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 20A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
1In Stock
Min.: 1
Mult.: 1
L50S Specialty Fuses Round Body Fuses 20 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Ferrule Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 30A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
2In Stock
Min.: 1
Mult.: 1
L50S Specialty Fuses Round Body Blade Fuses 30 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 40A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
11In Stock
Min.: 1
Mult.: 1
L50S Specialty Fuses Round Body Blade Fuses 40 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 200A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
10In Stock
Min.: 1
Mult.: 1
L50S Specialty Fuses Round Body Blade Fuses 200 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow 5AG Without Indicator Bulk
Littelfuse Specialty Fuses 50A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
4In Stock
Min.: 1
Mult.: 1
L70S Specialty Fuses Round Body Blade Fuses 50 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 100A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
4In Stock
Min.: 1
Mult.: 1
L70S Specialty Fuses Round Body Blade Fuses 100 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 1000A 150VAC 100VDC FF L15S POWR-SPEED
Datasheet
4In Stock
Min.: 1
Mult.: 1
L15S Specialty Fuses Round Body Blade Fuses 1 kA 150 VAC 100 VDC 100 kA at 150 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 70A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
7In Stock
Min.: 1
Mult.: 1
L50S Specialty Fuses Round Body Blade Fuses 70 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 20A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
20On Order
Min.: 1
Mult.: 1

L25S Specialty Fuses Round Body Blade Fuses 20 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 100A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
16Expected 25/02/2026
Min.: 1
Mult.: 1

L50S Specialty Fuses Round Body Blade Fuses 100 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 10A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
10Expected 09/04/2026
Min.: 1
Mult.: 1

L25S Specialty Fuses Round Body Blade Fuses 10 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 50A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
12Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L25S Specialty Fuses Round Body Blade Fuses 50 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 400A 250VAC 200VDC FF L25S POWR-SPEED
Datasheet
11Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L25S Specialty Fuses Round Body Blade Fuses 400 A 250 VAC 200 VDC 20 kA at 200 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 50A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
93Stock Available
More Info Available
Min.: 1
Mult.: 1

L50S Specialty Fuses Round Body Blade Fuses 50 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow 5AG Without Indicator Bulk
Littelfuse Specialty Fuses 300A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
63Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70S Specialty Fuses Round Body Blade Fuses 300 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 40A 150VAC VDC FF L15S POWR-SPEED
Datasheet
53Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L15S Specialty Fuses Cartridge Fuses 40 A 150 VAC 100 VDC Holder Clip Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 50A 150VAC VDC FF L15S POWR-SPEED
Datasheet
2Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L15S Specialty Fuses Cartridge Fuses 50 A 150 VAC 100 VDC Holder Clip Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 60A 150VAC VDC FF L15S POWR-SPEED
Datasheet
34Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L15S Specialty Fuses Cartridge Fuses 60 A 150 VAC 100 VDC Holder Clip Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 45A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
10Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L25S Specialty Fuses Round Body Blade Fuses 45 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 70A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
1Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L25S Specialty Fuses Round Body Blade Fuses 70 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk