70 Amp Fuses | McMaster-Carr

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About Fuses

Knife-Blade Style

Knife-Blade Style with Blown-Fuse Indicator

Also known as dual-element fuses, these time-delay 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. Use with Fuse Blocks for UL Class RK5 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.

Fuses with blown fuse indicator have a dot on the side that changes color when the fuse blows.

			Overall									Each
Current, A	Voltage	Breakthrough Current	Lg.	Dia.	No. of Elements	Cartridge Fuse Style	Blown Fuse Indicator	Specifications Met	UL File Number	CSA File Number		1-9	10-Up
Manufacturer Equivalent: FLN-R, FRN-R, TR-R
70	250V AC	200,000 A @ 250 V AC	5 7/8"	1 1/16"	2	Knife Blade	No	UL Listed, CSA Certified	E4273	053787_C_000	00000000	000000	000000
Manufacturer Equivalent: FLN-R-ID, FRN-R-ID, TR-R-ID
70	250V DC/250V AC	20,000 A @ 250 V DC 200,000 A @ 250 V AC	5 7/8"	1 1/16"	2	Knife Blade	Yes	UL Listed, CSA Certified	E2137	012636_0_000	00000000	00000	00000
Manufacturer Equivalent: FLS-R, FRS-R, TRS-R
70	600V AC/300V DC	20,000 A @ 300 V DC 200,000 A @ 600 V AC	7 7/8"	1 1/8"	2	Knife Blade	No	UL Listed, CSA Certified	E4273	053787_C_000	00000000	00000	00000
Manufacturer Equivalent: FRS-R-ID, IDSR, TRS-R-ID
70	600V DC/600V AC	20,000 A @ 600 V DC 200,000 A @ 600 V AC	7 7/8"	1 5/16"	2	Knife Blade	Yes	UL Listed, CSA Certified	E2137	012636_0_000	00000000	00000	00000

UL Class J Time-Delay Fuses for Tight Spaces

Knife-Blade Style

Knife-Blade Style with Blown-Fuse Indicator

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. More compact than UL Class RK1 or RK5 fuses, they are suitable for tight spaces. Use with Fuse Blocks for UL Class J 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.

Fuses with blown fuse indicator have a dot on the side that changes color when the fuse blows.

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	Blown Fuse Indicator	Specifications Met		1-9	10-Up
Manufacturer Equivalent: AJT, JTD, LPJ-SP
70	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	4 5/8"	1 1/8"	2	Knife Blade	No	UL Listed, CSA Certified	000000000	0000000	000000
Manufacturer Equivalent: AJT, JTD-ID, LPJ-SPI
70	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	4 5/8"	1 1/16"	2	Knife Blade	Yes	UL Listed, CSA Certified	0000000	00000	00000

UL Class K5 Fuses

Knife-Blade Style

Use these fast-acting fuses in applications where temporary overload current is not present, such as in lighting and heating. They open circuits quickly when surges are detected. Use with Fuse Blocks for UL Class K5 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: NLN, NON, OT
70	250V AC/250V DC	20,000 A @ 250 V DC 50,000 A @ 250 V AC	5 7/8"	1 1/16"	1	Knife Blade	UL Listed, CSA Certified	00000000	000000	000000
Manufacturer Equivalent: NLS, NOS, OTS
70	600V AC/300V DC	20,000 A @ 300 V DC 50,000 A @ 600 V AC	7 7/8"	1 5/16"	1	Knife Blade	UL Listed, CSA Certified	00000000	00000	00000

UL Class T Fuses for Extra-Tight Spaces

Knife-Blade Style

Smaller than UL Class J fuses, these fast-acting fuses can be used in extra-tight spaces such as meters, uninterruptible power supplies, and variable-speed drives. They open circuits quickly when surges are detected. Use with Fuse Blocks for UL Class T Fuses.

Breakthrough current, also known as interrupt current, 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: A6T, JJS, JLLS
70	600V AC	200,000 A @ 600 V AC	2 15/16"	3/4"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	000000000	000000	000000

Touch-Safe Fuses

Prevent accidental contact with electrical circuits—these fuses have an enclosed design with recessed plug-in blades. Also known as dual-element fuses, they withstand current overload for a short time so they won't open when exposed to harmless temporary surges, such as when starting a motor.

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.

Fuses with blown fuse indicator have a dot on the side that turns red when the fuse blows.

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

Fuses													DIN-Rail Mount Fuse Blocks
Current, A	UL Class	Voltage	Breakthrough Current	Ht.	Wd.	Dp.	No. of Elements	Blown Fuse Indicator	Protection Type	Specifications Met		Each		Each
Manufacturer Equivalent: TCF
70	CF	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	3.01"	1"	1.26"	2	Yes	Time Delay	UL Listed, CSA Certified, EN 63000, IEC 63000	0000000	0000000	0000000	000000