QS High-Speed Round Body Fuses

Littelfuse QS Series High-Speed Round Body Fuses provide circuit protection at the fast speeds required by modern semiconductor devices. These fuses offer extreme current limiting protection against power surges and balanced performance for longevity. L50QS and L70QS series high-speed fuses use arc-quenching stone sand to provide lower arc voltages while offering reduced l2t let-through energy and peak currents. This improved performance differentiates the QS series from other power fuses, including previous S series fuses. Universal mount bolted-end terminals give these RoHS and REACH-compliant fuses the ability to replace existing fuses in the field easily. Littelfuse QS series fuses are ideal for drive panel builders, the oil and gas industry, pulp and paper industries, motor controls, wastewater treatment plants, and other large factory settings.

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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 80A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
25In Stock
Min.: 1
Mult.: 1
L50QS Specialty Fuses Round Body Fuses 80 A 500 VAC 500 VDC 200 kA at 500 VAC Stud Bolt Down Fast Blow 25.4 mm x 92.08 mm Without Indicator Bulk
Littelfuse Specialty Fuses 175A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
8In Stock
Min.: 1
Mult.: 1

L50QS Specialty Fuses Round Body Fuses 175 A 500 VAC 500 VDC 200 kA at 500 VAC Stud Bolt Down Fast Blow 30.94 mm x 92.08 mm Without Indicator Bulk
Littelfuse Specialty Fuses 50A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
20In Stock
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 50 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 125A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
2In Stock
5Expected 2026-03-03
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 125 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 250A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
4In Stock
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 250 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 300A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
9In Stock
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 300 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 40A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
7In Stock
Min.: 1
Mult.: 1

L50QS Specialty Fuses Round Body Fuses 40 A 500 VAC 500 VDC 200 kA at 500 VAC Stud Bolt Down Fast Blow 25.4 mm x 92.08 mm Without Indicator Bulk
Littelfuse Specialty Fuses 70A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
17In Stock
Min.: 1
Mult.: 1

L50QS Specialty Fuses Round Body Fuses 70 A 500 VAC 500 VDC 200 kA at 500 VAC Stud Bolt Down Fast Blow 25.4 mm x 92.08 mm Without Indicator Bulk
Littelfuse Specialty Fuses 275A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
4In Stock
Min.: 1
Mult.: 1

L50QS Specialty Fuses Round Body Fuses 275 A 500 VAC 500 VDC 200 kA at 500 VAC Stud Bolt Down Fast Blow 38.1 mm x 110.31 mm Without Indicator Bulk
Littelfuse Specialty Fuses 700A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
1In Stock
Min.: 1
Mult.: 1
L50QS Specialty Fuses Round Body Fuses 700 A 500 VAC 500 VDC 200 kA at 500 VAC Stud Bolt Down Fast Blow 63.5 mm x 157.15 mm Without Indicator Bulk
Littelfuse Specialty Fuses 40A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
3In Stock
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 40 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 400A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
4In Stock
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 400 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 450A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
5In Stock
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 450 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 35A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
12Expected 2026-06-23
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 35 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 325A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
7Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L50QS Specialty Fuses Round Body Fuses 325 A 500 VAC 500 VDC 200 kA at 500 VAC Stud Bolt Down Fast Blow 38.1 mm x 110.31 mm Without Indicator Bulk
Littelfuse Specialty Fuses 90A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
14Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 90 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 225A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
38Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 225 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 700A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
4Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 700 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 800A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
2Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 800 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk
Littelfuse Specialty Fuses 800A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
Non-Stocked Lead-Time 8 Weeks
Min.: 1
Mult.: 1

L50QS Specialty Fuses Round Body Fuses 800 A 500 VAC 500 VDC 200 kA at 500 VAC Stud Bolt Down Fast Blow 63.5 mm x 157.15 mm Without Indicator Bulk
Littelfuse Specialty Fuses 175A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 1
Mult.: 1

L70QS Specialty Fuses Round Body Fuses 175 A 700 VAC 700 VDC 200 kA at 700 VAC Stud Bolt Down Fast Blow Without Indicator Bulk