Class T Fuses | McMaster-Carr

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About Fuses

Ferrule Style

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: A3T, JJN, JLLN
3	300V AC	200,000 A @ 300 V AC	7/8"	7/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	000000	000000
10	300V AC	200,000 A @ 300 V AC	7/8"	7/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
15	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	7/8"	7/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
20	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	7/8"	7/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
30	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	7/8"	7/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
35	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	7/8"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
40	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	7/8"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
50	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	7/8"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
60	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	7/8"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
80	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	2 3/16"	3/4"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	00000	00000
100	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	2 3/16"	3/4"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	00000	00000
150	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	2 7/16"	7/8"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	00000	00000
200	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	2 7/16"	7/8"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	00000	00000
300	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	2 3/4"	1"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	000000	000000
400	300V AC/160V DC	20,000 A @ 160 V DC 200,000 A @ 300 V AC	2 3/4"	1"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	000000	00000
Manufacturer Equivalent: A6T, JJS, JLLS
3	600V AC	200,000 A @ 600 V AC	1 1/2"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
10	600V AC	200,000 A @ 600 V AC	1 1/2"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
15	600V AC	200,000 A @ 600 V AC	1 1/2"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
20	600V AC	200,000 A @ 600 V AC	1 1/2"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
25	600V AC	200,000 A @ 600 V AC	1 1/2"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
30	600V AC	200,000 A @ 600 V AC	1 1/2"	9/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
35	600V AC	200,000 A @ 600 V AC	1 9/16"	13/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
40	600V AC	200,000 A @ 600 V AC	1 9/16"	13/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
45	600V AC	200,000 A @ 600 V AC	1 9/16"	13/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
50	600V AC	200,000 A @ 600 V AC	1 9/16"	13/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
60	600V AC	200,000 A @ 600 V AC	1 9/16"	13/16"	1	Ferrule	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
70	600V AC	200,000 A @ 600 V AC	2 15/16"	3/4"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
80	600V AC	200,000 A @ 600 V AC	2 15/16"	3/4"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
90	600V AC	200,000 A @ 600 V AC	2 15/16"	3/4"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	000000000	00000	00000
100	600V AC	200,000 A @ 600 V AC	2 15/16"	3/4"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	00000	00000
125	600V AC	200,000 A @ 600 V AC	3 1/4"	7/8"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	000000	00000
200	600V AC	200,000 A @ 600 V AC	3 1/4"	7/8"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	00000000	000000	00000
400	600V AC	200,000 A @ 600 V AC	3 5/8"	1"	1	Knife Blade	UL Listed, CSA Certified, CE Marked	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: A3T, JJN, JLLN
2	T	1/2-30	300V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
2	T	31-60	300V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
3	T	1/2-30	300V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
3	T	31-60	300V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
3	T	61-100	300V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
For Fuse Manufacturer Equivalent: A6T, JJS, JLLS
1	T	1/2-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
1	T	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
1	T	61-100	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
2	T	1/2-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
2	T	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
2	T	61-100	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
3	T	1/2-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
3	T	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
3	T	61-100	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	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 T Fuses for Extra-Tight Spaces

Fuse Blocks for UL Class Fuses

Fuse Block Safety Covers