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.

Results: 46
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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 Product
Current Rating
Voltage Rating AC
Fuse Type
Voltage Rating DC
Interrupt Rating
Termination Style
Class
Indicator Style
Packaging
Series
Littelfuse Industrial & Electrical Fuses 90A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
62In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 90 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 600A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
16In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1
Semiconductor Fuses 600 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 350A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
60In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 350 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 450A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
5In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 450 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 150A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
147In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 150 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 200A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
39In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 200 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 250A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
23In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 250 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 300A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
27In Stock
33Expected 10/5/2026
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 300 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS


Littelfuse Industrial & Electrical Fuses 600A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
56In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 600 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS


Littelfuse Industrial & Electrical Fuses 100A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
21In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 100 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 150A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
18In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 150 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 200A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
48In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 200 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 300A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
10In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 300 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 35A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
46In Stock
73Expected 10/14/2026
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 35 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 60A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
25In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 60 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 60A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
11In Stock
16Expected 10/29/2026
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1
Semiconductor Fuses 60 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 80A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
11In Stock
12Expected 10/22/2026
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1
Semiconductor Fuses 80 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS


Littelfuse Industrial & Electrical Fuses 400A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
6In Stock
32Expected 10/5/2026
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 400 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 450A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
4In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 450 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 50A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
8In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 50 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS


Littelfuse Industrial & Electrical Fuses 70A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
6In Stock
85Expected 11/24/2026
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 70 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 125A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
6In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 125 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 250A 700VAC 700VDC FF L70QS POWR-SPEED
Datasheet
1In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 250 A 700 VAC Fast-Acting Fuses 700 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L70QS
Littelfuse Industrial & Electrical Fuses 70A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
11In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 70 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS
Littelfuse Industrial & Electrical Fuses 225A 500VAC 500VDC FF L50QS POWR-SPEED
Datasheet
3In Stock
A tariff of 10% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Semiconductor Fuses 225 A 500 VAC Fast-Acting Fuses 500 VDC 200 kA Bolt Down Class aR Fuses Without Indicator Bulk L50QS