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
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Voltage Rating DC
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Littelfuse Specialty Fuses 80A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
33Stock Available
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L25S Specialty Fuses Round Body Blade Fuses 80 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 90A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
23Factory Stock Available
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L25S Specialty Fuses Round Body Blade Fuses 90 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 100A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
66Factory Stock Available
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Min.: 1
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L25S Specialty Fuses Round Body Blade Fuses 100 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 175A 250VAC 250VDC FF L25S POWR-SPEED
Datasheet
6Factory Stock Available
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L25S Specialty Fuses Round Body Blade Fuses 175 A 250 VAC 250 VDC 20 kA at 250 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 225A 250VAC 200VDC FF L25S POWR-SPEED
Datasheet
3Factory Stock Available
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Min.: 1
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L25S Specialty Fuses Round Body Blade Fuses 225 A 250 VAC 200 VDC 20 kA at 200 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 250A 250VAC 200VDC FF L25S POWR-SPEED
Datasheet
3Factory Stock Available
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L25S Specialty Fuses Round Body Blade Fuses 250 A 250 VAC 200 VDC 20 kA at 200 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 350A 250VAC 200VDC FF L25S POWR-SPEED
Datasheet
5Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L25S Specialty Fuses Round Body Blade Fuses 350 A 250 VAC 200 VDC 20 kA at 200 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 450A 250VAC 200VDC FF L25S POWR-SPEED
Datasheet
13Factory Stock Available
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Min.: 1
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L25S Specialty Fuses Round Body Blade Fuses 450 A 250 VAC 200 VDC 20 kA at 200 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 500A 250VAC 200VDC FF L25S POWR-SPEED
Datasheet
1Factory Stock Available
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L25S Specialty Fuses Round Body Blade Fuses 500 A 250 VAC 200 VDC 20 kA at 200 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 225A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
3Factory Stock Available
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L70S Specialty Fuses Round Body Blade Fuses 225 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 25A 150VAC 150VDC FF L15S POWR-SPEED
Datasheet
189Factory Stock Available
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L15S Specialty Fuses Round Body Blade Fuses 25 A 150 VAC 150 VDC 20 kA at 100 VDC Stud Bolt Down Fast Blow 5AG Without Indicator Bulk
Littelfuse Specialty Fuses 150A 150VAC 100VDC FF L15S POWR-SPEED
Datasheet
36Stock Available
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Min.: 1
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L15S Specialty Fuses Round Body Blade Fuses 150 A 150 VAC 100 VDC 20 kA at 100 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 80A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
31Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L50S Specialty Fuses Round Body Blade Fuses 80 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 125A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
67Factory Stock Available
More Info Available
Min.: 1
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L50S Specialty Fuses Round Body Blade Fuses 125 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 250A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
8Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L50S Specialty Fuses Round Body Blade Fuses 250 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 300A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
11Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L50S Specialty Fuses Round Body Blade Fuses 300 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 800A 500VAC 450VDC FF L50S POWR-SPEED
Datasheet
11Factory Stock Available
More Info Available
Min.: 1
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L50S Specialty Fuses Round Body Blade Fuses 800 A 500 VAC 450 VDC 20 kA at 450 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 20A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
48Factory Stock Available
More Info Available
Min.: 1
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L70S Specialty Fuses Round Body Blade Fuses 20 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 25A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
179Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70S Specialty Fuses Round Body Blade Fuses 25 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 35A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
37Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70S Specialty Fuses Round Body Blade Fuses 35 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 40A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
36Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70S Specialty Fuses Round Body Blade Fuses 40 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 150A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
115Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70S Specialty Fuses Round Body Blade Fuses 150 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 350A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
5Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70S Specialty Fuses Round Body Blade Fuses 350 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 500A 700VAC 650VDC FF L70S POWR-SPEED
Datasheet
10Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70S Specialty Fuses Round Body Blade Fuses 500 A 700 VAC 650 VDC 20 kA at 650 VDC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 5A 600VAC VDC FF KLC POWR-SPEED
Datasheet
10Factory Stock Available
More Info Available
Min.: 1
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KLC Specialty Fuses Cartridge Blade Fuses 5 A 600 VAC 200 kA at 600 VAC Stud Bolt Down Fast Blow Without Indicator Bulk