Class RK1 Fuses | McMaster-Carr

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Fuse UL Class

Current

Voltage

Overall Length

Fuse Type

Manufacturer Equivalent Fuse

Fuse Protection Type

Fuse Current

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For Fuse Manufacturer Equivalent

Overall Diameter

Breakthrough Current @ Voltage

300,000 amp @ 250V AC

200,000 amp @ 600V AC

300,000 amp @ 600V AC

100,000 amp @ 125V DC

20,000 amp @ 250V DC

100,000 amp @ 250V DC

20,000 amp @ 300V DC

100,000 amp @ 300V DC

With Blown Fuse Indicator

Yes

For Number of Fuses

Length

Number of Elements

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

RoHS

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Diameter

For Fuse Voltage

For Fuse Block Current

REACH

Mounting Location

99 Products

UL Class RK1 Time-Delay Fuses


Ferrule Cartridge Fuse	Knife-Blade Cartridge Fuse

Also known as dual-element fuses, these fuses withstand current overload for a short time so they won't open when exposed to harmless temporary surges, such as when starting a motor. They have a rejection-style end design that safeguards against replacement errors. Designed for use with Fuse Blocks for UL Class RK1 Fuses.

Breakthrough Current @ Voltage—Breakthrough current at voltage, labeled on the fuse as IR, is the maximum current that a fuse can safely stop in the event of a short circuit.

													Each
	Current, amp	Fuse UL Class	Voltage	Breakthrough Current @ Voltage	Overall Lg.	No. of Elements	Cartridge Fuse Type	Fuse Protection Type	With Blown Fuse Indicator	Rejection-Style End	Certification		1-9	10-Up
Manufacturer Equivalent Fuse: A2D-R, LLN-RK, LPN-RK







				9/16" Overall Diameter

				1/2	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	000000	000000


				1	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				1 1/4	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				2	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				2 1/2	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				3	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				5	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				6	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				10	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				15	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				20	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000


				30	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000




						13/16" Overall Diameter

						40	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	3"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000


						50	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	3"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
						60	RK1	250V AC, 125V DC	300,000 amp @ 250V AC 100,000 amp @ 125V DC	3"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000




								1 3/16" Overall Diameter

								100	RK1	250V AC, 250V DC	300,000 amp @ 250V AC 100,000 amp @ 250V DC	5 7/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	00000000	00000	00000




										1 11/16" Overall Diameter

										125	RK1	250V AC, 250V DC	300,000 amp @ 250V AC 100,000 amp @ 250V DC	7 1/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000


										200	RK1	250V AC, 250V DC	300,000 amp @ 250V AC 100,000 amp @ 250V DC	7 1/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	00000000	00000	00000




												2 3/8" Overall Diameter

												400	RK1	250V AC, 250V DC	300,000 amp @ 250V AC 100,000 amp @ 250V DC	8 5/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	00000000	000000	000000


												Manufacturer Equivalent Fuse: A6D-R, LLS-RK, LPS-RK







			13/16" Overall Diameter

			1/2										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000


			1										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			1 1/4										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			2										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			2 1/2										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			3										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			5										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			10										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			15										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			20										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
			30										RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000




														1 1/16" Overall Diameter

														35	RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5 1/2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000


				40	RK1									600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5 1/2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				50	RK1									600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5 1/2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000
				60	RK1									600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	5 1/2"	2	Ferrule	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	00000	00000




														1 3/16" Overall Diameter

						100								RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	7 7/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	00000000	00000	00000




														1 11/16" Overall Diameter

								125						RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	9 5/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	000000000	000000	000000


								200	RK1					600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	9 5/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	00000000	000000	000000




														2 3/8" Overall Diameter

										400				RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	11 5/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	00000000	000000	000000




														2 7/8" Overall Diameter

														600	RK1	600V AC, 300V DC	300,000 amp @ 600V AC 100,000 amp @ 300V DC	13 3/8"	2	Knife Blade	Time Delay	No	Yes	UL Listed, CSA Certified	00000000	000000	000000

UL Class RK1 Fast-Acting Fuses


Ferrule Cartridge Fuse	Knife-Blade Cartridge Fuse

These fuses open circuits quickly when surges are detected. They have a rejection-style end design that safeguards against replacement errors. Use with Fuse Blocks for UL Class RK1 Fuses.

Breakthrough Current @ Voltage—Breakthrough current at voltage, labeled on the fuse as IR, is the maximum current that a fuse can safely stop in the event of a short circuit.

													Each
	Current, amp	Fuse UL Class	Voltage	Breakthrough Current @ Voltage	Overall Lg.	No. of Elements	Cartridge Fuse Type	Fuse Protection Type	With Blown Fuse Indicator	Rejection-Style End	Certification		1-9	10-Up
Manufacturer Equivalent Fuse: A6K-R, KLS-R, KTS-R







				13/16" Overall Diameter

				1	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	000000	000000


				2	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				3	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				4	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				5	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				6	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				8	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				10	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				12	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				15	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				20	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000


				25	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
				30	RK1	600V AC, 250V DC	200,000 amp @ 600V AC 20,000 amp @ 250V DC	5"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000




						1 1/16" Overall Diameter

						40	RK1	600V AC, 300V DC	200,000 amp @ 600V AC 20,000 amp @ 300V DC	5 1/2"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000


						50	RK1	600V AC, 300V DC	200,000 amp @ 600V AC 20,000 amp @ 300V DC	5 1/2"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000
						60	RK1	600V AC, 300V DC	200,000 amp @ 600V AC 20,000 amp @ 300V DC	5 1/2"	1	Ferrule	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	00000	00000




								1 5/16" Overall Diameter

								80	RK1	600V AC, 300V DC	200,000 amp @ 600V AC 20,000 amp @ 300V DC	7 7/8"	1	Knife Blade	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	000000	000000


								90	RK1	600V AC, 300V DC	200,000 amp @ 600V AC 20,000 amp @ 300V DC	7 7/8"	1	Knife Blade	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	000000	000000
								100	RK1	600V AC, 300V DC	200,000 amp @ 600V AC 20,000 amp @ 300V DC	7 7/8"	1	Knife Blade	Fast Acting	No	Yes	UL Listed, CSA Certified	00000000	000000	000000

Fuse Block Reducers

Install reducers in fuse blocks to use small, low-amp fuses in blocks that are designed to hold large, high-amp fuses.

For Fuse
UL Class	Current	Voltage	For Fuse Block Current	Certification		Each
RK1, RK5	35 amp to 60 amp 1/10 amp to 30 amp	250V AC 600V AC	65 amp to 100 amp	UL Listed	00000000	000000
RK1, RK5	1/10 amp to 30 amp	250V AC	35 amp to 60 amp	UL Listed	00000000	00000
RK1, RK5	1/10 amp to 30 amp	250V AC	65 amp to 100 amp	UL Listed	00000000	00000
RK1, RK5	1/10 amp to 30 amp	600V AC	35 amp to 60 amp	UL Listed	00000000	00000
RK1, RK5	35 amp to 60 amp	600V AC	65 amp to 100 amp	UL Listed	00000000	00000
RK1, RK5	35 amp to 60 amp	600V AC	110 amp to 200 amp	UL Listed	00000000	000000

Fuse Blocks for UL Class Fuses


For 1 Fuse, Box-Lug Terminal Wire Connection	For 2 Fuses, Box-Lug-Terminal Wire Connection	For 3 Fuses, Box-Lug-Terminal Wire Connection

		For Fuse
	For No. of Fuses	UL Class	Current, amp	Type	Voltage, V AC	Wire Connection	Certification		Each
For Fuse Manufacturer Equivalent: A2D-R, FLN-R, FRN-R, LLN-RK, LPN-RK, TR-R



		1	RK1, RK5	1/10 to 30	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	000000


		1	RK1, RK5	31 to 60	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000
		1	RK1, RK5	61 to 100	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	0000000	00000
		1	RK1, RK5	101 to 200	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	000000
		2	RK1, RK5	1/10 to 30	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000
		2	RK1, RK5	31 to 60	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000
		2	RK1, RK5	61 to 100	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	0000000	000000
		3	RK1, RK5	1/10 to 30	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000
		3	RK1, RK5	31 to 60	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000
		3	RK1, RK5	61 to 100	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	0000000	000000
		3	RK1, RK5	101 to 200	Cartridge	250	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	000000


		For Fuse Manufacturer Equivalent: A6D-R, A6K-R, FLS-RIDSR, FRS-R, KLS-R, KTS-R, LLS-RK, LPS-RK, TRS-R



				1	RK1, RK5	1/10 to 30	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000


				1	RK1, RK5	31 to 60	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000
				1	RK1, RK5	61 to 100	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	0000000	00000
				1	RK1, RK5	101 to 200	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	000000
				2	RK1, RK5	1/10 to 30	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000
				2	RK1, RK5	31 to 60	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	000000
				3	RK1, RK5	1/10 to 30	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	00000
				3	RK1, RK5	31 to 60	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	000000
				3	RK1, RK5	61 to 100	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	0000000	000000
				3	RK1, RK5	101 to 200	Cartridge	600	Box-Lug Terminal	UL Listed, CSA Certified, CE Marked	00000000	000000

DIN-Rail/Surface-Mount Fuse Blocks


For 1 Fuse	For 2 Fuses	For 3 Fuses

Fuse blocks have a universal hole pattern, so they can be mounted on either DIN-rail or directly onto surfaces.

		For Fuse
	For No. of Fuses	UL Class	Current, amp	Type	Voltage	Wire Connection	For DIN Rail Size, mm	Certification		Each
For Fuse Manufacturer Equivalent: A2D-R, FLN-R, FRN-R, LLN-RK, LPN-RK, TR-R



		1	RK1, RK5	1 to 30	Cartridge	250V AC/250V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	000000


		1	RK1, RK5	31 to 60	Cartridge	250V AC/250V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000
		2	RK1, RK5	1 to 30	Cartridge	250V AC/250V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000
		2	RK1, RK5	31 to 60	Cartridge	250V AC/250V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000
		3	RK1, RK5	1 to 30	Cartridge	250V AC/250V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000
		3	RK1, RK5	31 to 60	Cartridge	250V AC/250V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000


		For Fuse Manufacturer Equivalent: A6K-R, FLS-R, FRS-R, IDSR, KLS-R, KTS-R, LLS-RK, LPS-RK, TRS-R



				1	RK1, RK5	1 to 30	Cartridge	600V AC/600V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000


				1	RK1, RK5	31 to 60	Cartridge	600V AC/600V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000
				2	RK1, RK5	1 to 30	Cartridge	600V AC/600V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000
				2	RK1, RK5	31 to 60	Cartridge	600V AC/600V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000
				3	RK1, RK5	1 to 30	Cartridge	600V AC/600V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000
				3	RK1, RK5	31 to 60	Cartridge	600V AC/600V DC	Box-Lug Terminal	35	UL Listed, CSA Certified	0000000	00000

Fuse Block Safety Covers

Prevent accidental shocks with these snap-on safety covers. They have slotted openings for testing with probes.

For Fuse
UL Class	Current	Protection Type	Voltage	Lg.	Wd.	Ht.	With Blown Fuse Indicator	Certification		Each
H, RK1, RK5 T	0.1 amp to 30 amp 1 amp to 30 amp	Fast Acting, Time Delay	250V AC 600V AC	3.8"	0.75"	1.7"	No	UL Listed, CSA Certified, CE Marked	0000000	000000
H, RK1, RK5 T	0.1 amp to 30 amp 1 amp to 30 amp	Fast Acting, Time Delay	250V AC 600V AC	3.8"	0.75"	1.7"	Yes	UL Listed, CSA Certified, CE Marked	0000000	00000