Class RK1 Fuses | McMaster-Carr

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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

Fuse Blocks for UL Class Fuses

For 1 Fuse with Box-Lug Terminal

For 2 Fuses with Box-Lug Terminals

For 3 Fuses with Box-Lug Terminals

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

	For Fuse
For No. of Fuses	UL Class	Current, A	Voltage	Wire Connection Type	Specifications Met		Each
For Fuse Manufacturer Equivalent: A2D-R, FLN-R, FRN-R, LLN-RK, LPN-RK, TR-R
1	RK1, RK5	1/10-30	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
1	RK1, RK5	31-60	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
1	RK1, RK5	61-100	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
1	RK1, RK5	101-200	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
2	RK1, RK5	1/10-30	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
2	RK1, RK5	31-60	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
2	RK1, RK5	61-100	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	000000
3	RK1, RK5	1/10-30	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
3	RK1, RK5	31-60	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
3	RK1, RK5	61-100	250V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	000000
3	RK1, RK5	101-200	250V AC	Box-Lug Terminals	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	1/10-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
1	RK1, RK5	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
1	RK1, RK5	61-100	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
1	RK1, RK5	101-200	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
2	RK1, RK5	1/10-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
2	RK1, RK5	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
3	RK1, RK5	1/10-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
3	RK1, RK5	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
3	RK1, RK5	61-100	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	000000
3	RK1, RK5	101-200	600V AC	Box-Lug Terminals	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 technical drawings and 3-D models, click on a part number.

	For Fuse
For No. of Fuses	UL Class	Current, A	Voltage	Wire Connection Type	For DIN Rail Size, mm	Specifications Met		Each
For Fuse Manufacturer Equivalent: A2D-R, FLN-R, FRN-R, LLN-RK, LPN-RK, TR-R
1	RK1, RK5	1-30	250V AC/250V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	000000
1	RK1, RK5	31-60	250V AC/250V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
2	RK1, RK5	1-30	250V AC/250V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
2	RK1, RK5	31-60	250V AC/250V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
3	RK1, RK5	1-30	250V AC/250V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
3	RK1, RK5	31-60	250V AC/250V DC	Box-Lug Terminals	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	1-30	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
1	RK1, RK5	31-60	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
2	RK1, RK5	1-30	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
2	RK1, RK5	31-60	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
3	RK1, RK5	1-30	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
3	RK1, RK5	31-60	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000

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, A	Voltage	For Fuse Block Current, A	Specifications Met		Each
RK1, RK5	0.1-30	250V AC	35-60	UL Listed	00000000	000000
RK1, RK5	0.1-30	600V AC	35-60	UL Listed	00000000	00000
RK1, RK5	35-60 0.1-30	250V AC 600V AC	65-100	UL Listed	00000000	00000
RK1, RK5	0.1-30	250V AC	65-100	UL Listed	00000000	00000
RK1, RK5	35-60	600V AC	65-100	UL Listed	00000000	00000
RK1, RK5	35-60	600V AC	110-200	UL Listed	00000000	000000

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, A	Protection Type	Voltage	Lg.	Wd.	Ht.	Blown Fuse Indicator	Specifications Met		Each
H, RK1, RK5 T	0.1-30 1-30	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	0.1-30 1-30	Fast Acting, Time Delay	250V AC 600V AC	3.8"	0.75"	1.7"	Yes	UL Listed, CSA Certified, CE Marked	0000000	00000

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About Fuses

UL Class RK1 Time-Delay Fuses

UL Class RK1 Fast-Acting Fuses

Fuse Blocks for UL Class Fuses

DIN-Rail/Surface-Mount Fuse Blocks

Fuse Block Reducers

Fuse Block Safety Covers