Industrial & Electrical Fuses

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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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RoHS Compliant

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (HKD) Filter the results in the table by unit price based on your quantity.	Qty.	Product	Current Rating	Voltage Rating AC	Fuse Type	Voltage Rating DC	Interrupt Rating	Termination Style	Class	Indicator Style	Packaging	Series
Industrial & Electrical Fuses 350A 500VAC 500VDC FF L50QS POWR-SPEED L50QS350.V Littelfuse 1: HK$1,102.38 56In Stock	Mfr. Part No. L50QS350.V Mouser Part No 576-L50QS350.V	Littelfuse	Industrial & Electrical Fuses 350A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	56In Stock	HK$1,102.38 HK$896.88 HK$824.30 HK$748.43	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
Industrial & Electrical Fuses 450A 700VAC 700VDC FF L70QS POWR-SPEED L70QS450.X Littelfuse 1: HK$2,935.53 5In Stock	Mfr. Part No. L70QS450.X Mouser Part No 576-L70QS450.X	Littelfuse	Industrial & Electrical Fuses 450A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	5In Stock	HK$2,935.53 HK$2,557.41	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
Industrial & Electrical Fuses 90A 500VAC 500VDC FF L50QS POWR-SPEED L50QS090.T Littelfuse 1: HK$550.66 43In Stock	Mfr. Part No. L50QS090.T Mouser Part No 576-L50QS090.T	Littelfuse	Industrial & Electrical Fuses 90A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	43In Stock	HK$550.66 HK$462.62 HK$457.03 HK$343.84 View HK$326.17 HK$303.07	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
Industrial & Electrical Fuses 100A 500VAC 500VDC FF L50QS POWR-SPEED L50QS100.T Littelfuse 1: HK$506.60 286In Stock 90Expected 5/11/2026	Mfr. Part No. L50QS100.T Mouser Part No 576-L50QS100.T	Littelfuse	Industrial & Electrical Fuses 100A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	286In Stock 90Expected 5/11/2026	HK$506.60 HK$435.08 HK$389.79 HK$355.93 View HK$326.50 HK$303.07	Min.: 1 Mult.: 1	Semiconductor Fuses	100 A	500 VAC	Fast-Acting Fuses	500 VDC	200 kA	Bolt Down	Class aR Fuses	Without Indicator	Bulk	L50QS
Industrial & Electrical Fuses 150A 500VAC 500VDC FF L50QS POWR-SPEED L50QS150.V Littelfuse 1: HK$792.08 115In Stock	Mfr. Part No. L50QS150.V Mouser Part No 576-L50QS150.V	Littelfuse	Industrial & Electrical Fuses 150A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	115In Stock	HK$792.08 HK$679.63 HK$633.93 HK$534.96 View HK$492.54 Quote	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
Industrial & Electrical Fuses 200A 500VAC 500VDC FF L50QS POWR-SPEED L50QS200.V Littelfuse 1: HK$830.38 29In Stock	Mfr. Part No. L50QS200.V Mouser Part No 576-L50QS200.V	Littelfuse	Industrial & Electrical Fuses 200A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	29In Stock	HK$830.38 HK$688.67 HK$635.16 HK$525.42 HK$485.31	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
Industrial & Electrical Fuses 250A 500VAC 500VDC FF L50QS POWR-SPEED L50QS250.V Littelfuse 1: HK$1,320.38 20In Stock	Mfr. Part No. L50QS250.V Mouser Part No 576-L50QS250.V	Littelfuse	Industrial & Electrical Fuses 250A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	20In Stock	HK$1,320.38 HK$1,094.99 HK$1,009.74 HK$835.23 HK$768.90	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
Industrial & Electrical Fuses 300A 500VAC 500VDC FF L50QS POWR-SPEED L50QS300.V Littelfuse 1: HK$1,320.38 27In Stock 33Expected 7/1/2027	Mfr. Part No. L50QS300.V Mouser Part No 576-L50QS300.V	Littelfuse	Industrial & Electrical Fuses 300A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	27In Stock 33Expected 7/1/2027	HK$1,320.38 HK$1,094.99 HK$1,009.74 HK$835.23 HK$768.90	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
Industrial & Electrical Fuses 600A 500VAC 500VDC FF L50QS POWR-SPEED L50QS600.X Littelfuse 1: HK$1,965.73 56In Stock	Mfr. Part No. L50QS600.X Mouser Part No 576-L50QS600.X	Littelfuse	Industrial & Electrical Fuses 600A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	56In Stock	HK$1,965.73 HK$1,629.53 HK$1,502.29 HK$1,241.38	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
Industrial & Electrical Fuses 100A 700VAC 700VDC FF L70QS POWR-SPEED L70QS100.V Littelfuse 1: HK$1,081.09 21In Stock	Mfr. Part No. L70QS100.V Mouser Part No 576-L70QS100.V	Littelfuse	Industrial & Electrical Fuses 100A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	21In Stock	HK$1,081.09 HK$925.08 HK$854.63 HK$683.66 HK$629.32	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
Industrial & Electrical Fuses 200A 700VAC 700VDC FF L70QS POWR-SPEED L70QS200.V Littelfuse 1: HK$1,523.74 38In Stock	Mfr. Part No. L70QS200.V Mouser Part No 576-L70QS200.V	Littelfuse	Industrial & Electrical Fuses 200A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	38In Stock	HK$1,523.74 HK$1,292.02 HK$1,192.89 HK$962.73	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
Industrial & Electrical Fuses 600A 700VAC 700VDC FF L70QS POWR-SPEED L70QS600.X Littelfuse 1: HK$3,381.05 15In Stock	Mfr. Part No. L70QS600.X Mouser Part No 576-L70QS600.X	Littelfuse	Industrial & Electrical Fuses 600A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	15In Stock	HK$3,381.05 HK$2,904.21 HK$2,622.84 Quote Quote	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
Industrial & Electrical Fuses 60A 500VAC 500VDC FF L50QS POWR-SPEED L50QS060.T Littelfuse 1: HK$537.59 11In Stock 16Expected 10/11/2026	Mfr. Part No. L50QS060.T Mouser Part No 576-L50QS060.T	Littelfuse	Industrial & Electrical Fuses 60A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	11In Stock 16Expected 10/11/2026	HK$537.59 HK$466.40 HK$431.88 HK$333.81 View HK$307.43 HK$275.53	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
Industrial & Electrical Fuses 80A 500VAC 500VDC FF L50QS POWR-SPEED L50QS080.T Littelfuse 1: HK$597.35 2In Stock 12Expected 31/12/2026	Mfr. Part No. L50QS080.T Mouser Part No 576-L50QS080.T	Littelfuse	Industrial & Electrical Fuses 80A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	2In Stock 12Expected 31/12/2026	HK$597.35 HK$495.34 HK$457.03 HK$378.45 View HK$351.32 HK$327.90	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
Industrial & Electrical Fuses 175A 500VAC 500VDC FF L50QS POWR-SPEED L50QS175.V Littelfuse 1: HK$830.38 10In Stock	Mfr. Part No. L50QS175.V Mouser Part No 576-L50QS175.V	Littelfuse	Industrial & Electrical Fuses 175A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	10In Stock	HK$830.38 HK$688.67 HK$635.16 HK$525.42 HK$485.31	Min.: 1 Mult.: 1	Semiconductor Fuses	175 A	500 VAC	Fast-Acting Fuses	500 VDC	200 kA	Bolt Down	Class aR Fuses	Without Indicator	Bulk	L50QS
Industrial & Electrical Fuses 500A 500VAC 500VDC FF L50QS POWR-SPEED L50QS500.X Littelfuse 1: HK$1,965.73 2In Stock 14Expected 14/12/2026	Mfr. Part No. L50QS500.X Mouser Part No 576-L50QS500.X	Littelfuse	Industrial & Electrical Fuses 500A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	2In Stock 14Expected 14/12/2026	HK$1,965.73 HK$1,629.53 HK$1,502.29 HK$1,241.38	Min.: 1 Mult.: 1	Semiconductor Fuses	500 A	500 VAC	Fast-Acting Fuses	500 VDC	200 kA	Bolt Down	Class aR Fuses	Without Indicator	Bulk	L50QS
Industrial & Electrical Fuses 50A 700VAC 700VDC FF L70QS POWR-SPEED L70QS050.V Littelfuse 1: HK$857.43 2In Stock	Mfr. Part No. L70QS050.V Mouser Part No 576-L70QS050.V	Littelfuse	Industrial & Electrical Fuses 50A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	2In Stock	HK$857.43 HK$711.03 HK$655.79 HK$542.44 HK$501.09	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
Industrial & Electrical Fuses 70A 700VAC 700VDC FF L70QS POWR-SPEED L70QS070.V Littelfuse 1: HK$1,115.37 5In Stock 159Expected 12/1/2027	Mfr. Part No. L70QS070.V Mouser Part No 576-L70QS070.V	Littelfuse	Industrial & Electrical Fuses 70A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	5In Stock 159Expected 12/1/2027	HK$1,115.37 HK$950.40 HK$876.42 HK$724.68 HK$667.14	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
Industrial & Electrical Fuses 150A 700VAC 700VDC FF L70QS POWR-SPEED L70QS150.V Littelfuse 1: HK$1,523.74 12In Stock	Mfr. Part No. L70QS150.V Mouser Part No 576-L70QS150.V	Littelfuse	Industrial & Electrical Fuses 150A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	12In Stock	HK$1,523.74 HK$1,292.10 HK$1,192.89 HK$962.73	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
Industrial & Electrical Fuses 350A 700VAC 700VDC FF L70QS POWR-SPEED L70QS350.X Littelfuse 1: HK$2,179.94 7In Stock	Mfr. Part No. L70QS350.X Mouser Part No 576-L70QS350.X	Littelfuse	Industrial & Electrical Fuses 350A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	7In Stock	HK$2,179.94 HK$1,851.97 HK$1,707.21 HK$1,410.31	Min.: 1 Mult.: 1	Semiconductor Fuses	350 A	700 VAC	Fast-Acting Fuses	700 VDC	200 kA	Bolt Down	Class aR Fuses	Without Indicator	Bulk	L70QS
Industrial & Electrical Fuses 35A 500VAC 500VDC FF L50QS POWR-SPEED L50QS035.T Littelfuse 1: HK$514.00 32In Stock 140Expected 18/1/2027	Mfr. Part No. L50QS035.T Mouser Part No 576-L50QS035.T	Littelfuse	Industrial & Electrical Fuses 35A 500VAC 500VDC FF L50QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	32In Stock 140Expected 18/1/2027	HK$514.00 HK$430.65 HK$418.48 HK$346.47 View HK$320.50 HK$289.34	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
Industrial & Electrical Fuses 35A 700VAC 700VDC FF L70QS POWR-SPEED L70QS035.V Littelfuse 1: HK$857.43 3In Stock 6Expected 25/1/2027	Mfr. Part No. L70QS035.V Mouser Part No 576-L70QS035.V	Littelfuse	Industrial & Electrical Fuses 35A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	3In Stock 6Expected 25/1/2027	HK$857.43 HK$711.03 HK$655.79 HK$542.44 HK$501.09	Min.: 1 Mult.: 1	Semiconductor Fuses	35 A	700 VAC	Fast-Acting Fuses	700 VDC	200 kA	Bolt Down	Class aR Fuses	Without Indicator	Bulk	L70QS
Industrial & Electrical Fuses 60A 700VAC 700VDC FF L70QS POWR-SPEED L70QS060.V Littelfuse 1: HK$853.07 23In Stock	Mfr. Part No. L70QS060.V Mouser Part No 576-L70QS060.V	Littelfuse	Industrial & Electrical Fuses 60A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	23In Stock	HK$853.07 HK$731.58 HK$676.34 HK$539.81 HK$496.98	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
Industrial & Electrical Fuses 175A 700VAC 700VDC FF L70QS POWR-SPEED L70QS175.V Littelfuse 1: HK$1,523.74 2In Stock	Mfr. Part No. L70QS175.V Mouser Part No 576-L70QS175.V	Littelfuse	Industrial & Electrical Fuses 175A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	2In Stock	HK$1,523.74 HK$1,206.04 HK$1,122.61 HK$962.73	Min.: 1 Mult.: 1	Semiconductor Fuses	175 A	700 VAC	Fast-Acting Fuses	700 VDC	200 kA	Bolt Down	Class aR Fuses	Without Indicator	Bulk	L70QS
Industrial & Electrical Fuses 400A 700VAC 700VDC FF L70QS POWR-SPEED L70QS400.X Littelfuse 1: HK$2,136.54 4In Stock	Mfr. Part No. L70QS400.X Mouser Part No 576-L70QS400.X	Littelfuse	Industrial & Electrical Fuses 400A 700VAC 700VDC FF L70QS POWR-SPEED Learn More about Littelfuse qs high speed fuses	Datasheet	4In Stock	HK$2,136.54 HK$1,771.16 HK$1,632.90 HK$1,349.31	Min.: 1 Mult.: 1	Semiconductor Fuses	400 A	700 VAC	Fast-Acting Fuses	700 VDC	200 kA	Bolt Down	Class aR Fuses	Without Indicator	Bulk	L70QS