JLLN1 [ETC]
Fuse ; 保险丝\n
ETC 
JLLN/JLLS POWR-T™ Class T Fuses
ꢀ
ꢀ
300/600 VAC Fast-Acting 1 – 1200 Amperes
SPECIFICATIONS
Voltage ratings: AC: 300 Volts (JLLN); 600 Volts (JLLS)
DC: 125 Volts (JLLN 110 – 1200A);
300 Volts (JLLS)
Interrupting ratings:AC: 200,000 amperes rms symmetrical
DC: 20,000 amperes (JLLN 110 – 1200A)
(JLLS 1 – 1200A)
GENERAL
PURPOSE
FUSES
Ampere range: 1– 1200 amperes
Approvals: AC: UL Listed Class T per UL 248
(formerly UL 198H)
(File No. E81895): JLLN/JLLS (1 – 800A)
UL Recognized (
) (File No. E71611):
JLLS (900 – 1200A)
CSA Certified HRCI-T (File No. LR29862):
JLLN/JLLS (1 – 600A)
DC: Additionally UL Listed per UL 198L:
JLLN (110 – 1200A) (File No. E81895)
JLLS 300 VDC is Littelfuse self-certified
AMPERE RATINGS
1
2
3
6
10
15
20
25
30
35
40
45
50
60
70
80
90
100
110
125
150
175
200
225
250
300
350
400
450
500
600
700
800
1000
1100
1200
*
JLLS only.
*
Example part number (series & amperage): JLLS 100
RECOMMENDED FUSE BLOCKS
LT300 series (for JLLN series fuses)
LT600 series (for JLLS series fuses)
Space saving POWR-T™ fuses are the most compact fuses
available in ratings above 30 amperes — less than one-third
the size of comparable Class R fuses. When rated in accor-
dance with the NEC, POWR-T fuses provide fast-acting
overload and short circuit protection for non-inductive circuits
and equipment. Used in inductive circuits, the ampere rating
of POWR-T fuses must be increased to prevent opening on
inrush currents. In such instances, POWR-T fuses may
provide only short circuit protection.
Refer to Fuse Block section of this catalog for additional infor-
mation.
ꢀ
Extremely current limiting — Stops damaging short circuit
current faster than any mechanical protective device.
ꢀ
Fast-acting — Provides fast-acting overload protection to
equipment such as variable speed drives, rectifiers and
other equipment containing surge-sensitive components.
For motor and general purpose circuits where space is not
critical, we recommend POWR-PRO® JTD_ID Indicator
series, LLNRK/LLSRK series, or FLSR_ID Indicator series.
LONGER EQUIPMENT LIFE
APPLICATIONS
ꢀ
Current limiting design greatly reduces damage to equip-
ment caused by heating and magnetic effects of short
circuit currents.
Protection of individual electric services and meters.
Main switches containing Class T fuses may be used to
provide compact protection for meter stacks.
ECONOMICAL
Molded case circuit breaker load centers and panelboards
have increased interrupting ratings when “series rated” with
Littelfuse Class T fuses. Refer to panelboard manufacturers’
literature for UL Listed combination of fuses and panelboards.
Series ratings up to 200,000 amperes are available.
ꢀ
Extremely current limiting design often permits use of
readily available, less costly equipment.
ꢀ
Used as input or output fuses for surge-sensitive compo-
nents, such as variable speed drives and rectifiers, fast-
acting POWR-T JLLN/JLLS fuses may prevent opening of
expensive semiconductor fuses protecting individual
components.
SPACE-SAVING
Typical three-pole Class T fuse blocks require less than 50%
of the panel area required for Class R fuse blocks. Switch
enclosures, fuse pullouts, and other equipment using Class T
fuses are often correspondingly more compact.
NOTE: JLLN Class T 300 volt fuses are UL listed for circuits
not exceeding 300 volts to ground. However, since UL does
not include testing 300 volt Class T fuses on 277/480 volt
three-phase bolted faults, Littelfuse does not recommend
using 300 volt Class T fuses where phase-to-phase voltage
exceeds 300 volts.
SAFETY
ꢀ
200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes.
39
JLLN/JLLS POWR-T™ Class T Fuses
ꢀ
ꢀ
300/600 VAC Fast-Acting 1 – 1200 Amperes
C
G
B
GENERAL
PURPOSE
FUSES
D
B
D
C
F
C
A
F
E
A
D
A
Fig. 1
Fig. 2
Fig. 3
DIMENSIONS IN INCHES (mm in parentheses)
REFER TO
FIG. NO.
AMPERES
SERIES
A
B
C
D
E
F
G
7/8
(22.2)
—
9/32
(7.1)
13/32
(10.3)
—
—
—
—
—
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
1
1 – 30
1-1/2
(38.1)
—
—
9/32
(7.1)
9/16
(14.3)
—
—
—
—
—
7/8
(22.2)
9/32
(7.1)
9/16
(14.3)
1
2
35 – 60
70 – 100
1-9/16
(39.7)
13/16
(20.6)
13/32
(10.3)
1
1/16
(1.6)
1-3/32
(27.8)
(25.4)
2-5/32
(54.8)
1-9/16
(39.7)
3/4
(19.1)
13/16
(20.6)
27/32
(21.4)
9/32
(7.1)
1/8
(3.2)
3
2-61/64
(75.0)
2-23/64
(59.9)
3/4
(19.1)
13/16
(20.6)
1-41/64
(41.7)
9/32
(7.1)
1/8
(3.2)
2-7/16
(61.9)
1-11/16
(42.9)
7/8
(22.2)
1-1/16
(27.0)
27/32
(21.4)
11/32
(8.7)
3/16
(4.8)
3
3
3
3
3
110 – 200
225 – 400
450 – 600
700 –800
900 – 1200
3-1/4
(82.6)
2-1/2
(63.5)
7/8
(22.2)
1-1/16
(27.0)
1-21/32
(42.1)
11/32
(8.7)
3/16
(4.8)
2-3/4
(69.9)
1-27/32
(46.8)
1
1-5/16
(33.3)
53/64
(21.0)
13/32
(10.3)
1/4
(6.4)
(25.4)
3-5/8
(92.1)
2-23/32
(69.1)
1
1-19/32
(40.5)
1-23/32
(43.7)
13/32
(10.3)
1/4
(6.4)
(25.4)
3-1/16
(77.8)
2-1/32
(51.6)
1-1/4
(31.8)
1-19/32
(40.5)
7/8
(22.2)
31/64
(12.3)
5/16
(7.9)
3-63/64
(101.2)
2-61/64
(75.0)
1-1/4
(31.8)
2-1/16
(52.4)
1-49/64
(44.8)
31/64
(12.3)
5/16
(7.9)
3-3/8
(85.7)
2-7/32
(64.3)
1-3/4
(44.5)
2-1/16
(52.4)
7/8
(22.2)
35/64
(13.9)
3/8
(9.5)
4-21/64
(109.9)
3-11/64
(80.6)
1-3/4
(44.5)
2-1/2
(63.5)
1-55/64
(47.2)
35/64
(13.9)
3/8
(9.5)
4
2-17/32
(64.3)
2
2-1/2
(63.5)
1-1/32
(26.2)
39/64
(15.5)
7/16
(11.1)
(101.6)
(50.8)
5.27
(133.9)
3.80
(96.5)
2
2.63
(66.8)
2.30
(58.4)
.67
(15.5)
.44
(11.2)
(50.8)
40
JLLN/JLLS POWR-T™ Class T Fuses
ꢀ
ꢀ
300/600 VAC Fast-Acting 1 – 1200 Amperes
JLLN
JLLS
1000
800
600
1000
800
600
GENERAL
PURPOSE
FUSES
400
300
400
300
200
200
100
80
60
100
80
60
40
30
40
30
20
20
10
8
6
10
8
6
4
3
4
3
2
2
1
1
.8
.8
.6
.6
.4
.3
.4
.3
.2
.2
.1
.1
.08
.08
.06
.06
.04
.03
.04
.03
.02
.02
.01
.01
CURRENT IN AMPERES
CURRENT IN AMPERES
JLLN
JLLS
1000000
800000
1000000
800000
600000
600000
400000
300000
400000
300000
200000
200000
100000
80000
100000
80000
60000
60000
800A
600A
1200A
800A
600A
400A
40000
30000
40000
30000
400A
200A
20000
20000
200A
100A
100A
60A
10000
8000
6000
10000
8000
6000
60A
30A
30A
4000
3000
4000
3000
2000
2000
1000
800
1000
800
600
600
400
300
400
300
200
200
100
100
AVAILABLE FAULT CURRENT
SYMMETRICAL R. M. S. AMPERES
AVAILABLE FAULT CURRENT
SYMMETRICAL R. M. S. AMPERES
41
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