Class RK1 Fuses | McMaster-Carr

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RK1

	UL Class UL Class	Hide

RK5

RK1

	Current Current

	Voltage Voltage

	Fuse Type Fuse Type

	Cartridge

	Overall Length Overall Length

	Overall Diameter Overall Diameter

	Manufacturer Equivalent Manufacturer Equivalent

	Protection Type Protection Type

Time Delay

Fast Acting

	Cartridge Fuse Style Cartridge Fuse Style

Ferrule

Knife Blade

	Breakthrough Current Breakthrough Current

	Blown Fuse Indicator Blown Fuse Indicator

	Specifications Met Specifications Met

CSA

	Rejection-Style End Rejection-Style End

Yes

	Number of Elements Number of Elements

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

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About Fuses

Ferrule Style

Knife-Blade Style

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

			Overall						Each
Current, A	Voltage	Breakthrough Current	Lg.	Dia.	No. of Elements	Cartridge Fuse Style	Specifications Met		1-9	10-Up
Manufacturer Equivalent: A2D-R, LLN-RK, LPN-RK
1/2	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	000000	000000
1	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
1 1/4	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
2	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
2 1/2	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
3	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
5	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
6	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
10	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
15	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
20	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
30	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	2"	9/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
40	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	3"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
50	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	3"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
60	250V AC/125V DC	100,000 A @ 125 V DC 300,000 A @ 250 V AC	3"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
100	250V DC/250V AC	100,000 A @ 250 V DC 300,000 A @ 250 V AC	5 7/8"	1 3/16"	2	Knife Blade	UL Listed, CSA Certified	00000000	00000	00000
125	250V DC/250V AC	100,000 A @ 250 V DC 300,000 A @ 250 V AC	7 1/8"	1 11/16"	2	Knife Blade	UL Listed, CSA Certified	000000000	000000	000000
200	250V DC/250V AC	100,000 A @ 250 V DC 300,000 A @ 250 V AC	7 1/8"	1 11/16"	2	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000
400	250V DC/250V AC	100,000 A @ 250 V DC 300,000 A @ 250 V AC	8 5/8"	2 3/8"	2	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000
Manufacturer Equivalent: A6D-R, LLS-RK, LPS-RK
1/2	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
1	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
1 1/4	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
2	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
2 1/2	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
3	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
5	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
10	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
15	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
20	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
30	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5"	13/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
35	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5 1/2"	1 1/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
40	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5 1/2"	1 1/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
50	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5 1/2"	1 1/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
60	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5 1/2"	1 1/16"	2	Ferrule	UL Listed, CSA Certified	000000000	00000	00000
100	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	7 7/8"	1 3/16"	2	Knife Blade	UL Listed, CSA Certified	00000000	00000	00000
125	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	9 5/8"	1 11/16"	2	Knife Blade	UL Listed, CSA Certified	000000000	000000	000000
200	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	9 5/8"	1 11/16"	2	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000
400	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	11 5/8"	2 3/8"	2	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000
600	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	13 3/8"	2 7/8"	2	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000

UL Class RK1 Fast-Acting Fuses

Ferrule Style

Knife-Blade Style

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, 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						Each
Current, A	Voltage	Breakthrough Current	Lg.	Dia.	No. of Elements	Cartridge Fuse Style	Specifications Met		1-9	10-Up
Manufacturer Equivalent: A6K-R, KLS-R, KTS-R
1	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	000000	000000
2	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
3	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
4	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
5	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
6	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
8	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
10	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
12	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
15	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
20	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
25	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
30	600V AC/250V DC	20,000 A @ 250 V DC 200,000 A @ 600 V AC	5"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
40	600V AC/300V DC	20,000 A @ 300 V DC 200,000 A @ 600 V AC	5 1/2"	1 1/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
50	600V AC/300V DC	20,000 A @ 300 V DC 200,000 A @ 600 V AC	5 1/2"	1 1/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
60	600V AC/300V DC	20,000 A @ 300 V DC 200,000 A @ 600 V AC	5 1/2"	1 1/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
80	600V AC/300V DC	20,000 A @ 300 V DC 200,000 A @ 600 V AC	7 7/8"	1 5/16"	1	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000
90	600V AC/300V DC	20,000 A @ 300 V DC 200,000 A @ 600 V AC	7 7/8"	1 5/16"	1	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000
100	600V AC/300V DC	20,000 A @ 300 V DC 200,000 A @ 600 V AC	7 7/8"	1 5/16"	1	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000

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About Fuses

UL Class RK1 Time-Delay Fuses

UL Class RK1 Fast-Acting Fuses