Bussmann-Type FWH Fuses | McMaster-Carr

	Current Current

	Manufacturer Equivalent Manufacturer Equivalent

A50QS

FWH

L50S

	Overall Length Overall Length

3 3/16"

3 5/8"

4 5/16"

	Overall Diameter Overall Diameter

	Cartridge Fuse Style Cartridge Fuse Style

Knife Blade

Ferrule

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant with
Exemptions

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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About Fuses

Ferrule Style

Knife-Blade Style

With a quicker response than standard fast-acting fuses, these fuses provide the best protection for sensitive electronics.

Breakthrough current, labeled on the fuse as IR, is the maximum current that a fuse can safely stop in the event of a short circuit.

For technical drawings and 3-D models, click on a part number.

			Overall
Current, A	Voltage	Breakthrough Current	Lg.	Dia.	No. of Elements	Cartridge Fuse Style	Protection Type	Specifications Met		Each
Manufacturer Equivalent: A50QS, FWH, L50S
10	500V AC	200,000 A @ 500 V AC	2"	9/16"	1	Ferrule	Fast Acting	UL Recognized Component	000000000	000000
20	500V AC	200,000 A @ 500 V AC	2"	9/16"	1	Ferrule	Fast Acting	UL Recognized Component	000000000	00000
30	500V AC	200,000 A @ 500 V AC	2"	9/16"	1	Ferrule	Fast Acting	UL Recognized Component	000000000	00000
40	500V AC	200,000 A @ 500 V AC	3 3/16"	13/16"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	00000
50	500V AC	200,000 A @ 500 V AC	3 3/16"	13/16"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	00000
60	500V AC	200,000 A @ 500 V AC	3 3/16"	13/16"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	00000
80	500V AC	200,000 A @ 500 V AC	3 5/8"	15/16"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	00000
100	500V AC	200,000 A @ 500 V AC	3 5/8"	15/16"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	00000
125	500V AC	200,000 A @ 500 V AC	3 5/8"	1 3/16"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	000000
150	500V AC	200,000 A @ 500 V AC	3 5/8"	1 3/16"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	000000
200	500V AC	200,000 A @ 500 V AC	3 5/8"	1 3/16"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	000000
300	500V AC	200,000 A @ 500 V AC	4 5/16"	1 1/2"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	000000
400	500V AC	200,000 A @ 500 V AC	4 5/16"	1 1/2"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	000000
600	500V AC	200,000 A @ 500 V AC	4 5/16"	2"	1	Knife Blade	Fast Acting	UL Recognized Component	000000000	000000

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About Fuses

Fuses for Sensitive Electronics