LIMITRON™ 300V Class T
JJN — 300Vac, 1-1200A, Fast-Acting Fuses
Dimensions – in
0.88"
( 0.02)
3.06"
( 0.04)
.41" Dia.
( 0.02)
1 to 30A
0.88"
( 0.02)
2.03"
0.88"
1.25"
( 0.04)
0.56" Dia.
( 0.02)
450 to 600A
35 to 60A
3.38"
( 0.04)
2.16"
( 0.02)
Description: Advanced protection Class T current -limiting,
fast-acting fuses.
0.284"
(Typ. 2)
1.56"
0.84"
Ratings:
0.344"
(Typ. 2)
Volts — 300Vac (1-10A)
IR — 200kA Vac RMS Sym.
— 100kA Vdc (700-1200A)
CE, UL Listed, Std. 248-15, Class T, Guide JDDZ, File E4273
CSA Certified, C22.2 No. 248.15, Class 1422-02, File 53787
Catalog Numbers (amps)
0713
BU-SB13734
2"
( 0.04)
1"
( 0.04)
225 to 400A
Agency Information:
Carton Qty.
10
10
5
1
1
1
1
1
4"
( 0.04)
2.53"
1.08"
2.75"
( 0.04)
1.84"
0.86"
0.406"
(Typ. 2)
— 20kA Vdc (15-600A)
JJN-250
JJN-300
JJN-350
JJN-400
JJN-450
JJN-500
JJN-600
JJN-700
JJN-800
JJN-1000
JJN-1200
0.562"
(Typ. 2)
601 to 800A
0.88"
( 0.02)
Amps — 1-1200A
Amp Rating
1–30
35–60
70–100
110–200
225–400
450–600
700–800
1000–1200
1.75"
( 0.04)
110 to 200A
— 300Vac, 170Vdc (700-1200A)
Carton Quantity and Weight
0.75"
( 0.02)
2.44"
( 0.02)
1.69"
0.84"
— 300Vac, 160Vdc (15-600A)
JJN-50
JJN-60
JJN-70
JJN-80
JJN-90
JJN-100
JJN-110
JJN-125
JJN-150
JJN-175
JJN-200
JJN-225
2.22"
0.92"
70 to 100A
Catalog Symbol: JJN-(amp)
JJN-1
JJN-2
JJN-3
JJN-6
JJN-10
JJN-15
JJN-20
JJN-25
JJN-30
JJN-35
JJN-40
JJN-45
0.484"
(Typ. 2)
0.609"
(Typ. 2)
801 to 1200A
Features:
• Small, space-saving fuses provide a high degree of current
limitation on short-circuits for excellent component
protection
• Commonly applied in electric heat circuits, load center,
disconnect switches, and meters
• The small size of the JJN Class T fuses permits installation
in panelboards and control centers for system upgrading
when existing circuit breakers cannot safely interrupt larger
available short-circuit currents
• High speed of response for semiconductor protection
Recommended Fuse Blocks
Fuse Amps
½-30
35-60
70-100
110-200
200
225-400
450- 600
1-Poles
2-Pole
—
T30030-2_
—
T30060-2_
—
T30100-1_
T30200-1_
—
1B0083
—
T30400-1_
—
T30600-1_
—
3-Pole
T30030-3_
T30060-3_
T30100-2_
—
—
—
—
4-Pole
T30030-4_
T30060-4_
T30100-3_
—
—
—
—
For additional information on 300 volt Class T fuse blocks, see
Data Sheet # 1115.
Page 1 of 3
Data Sheet # 1025
LIMITRON™ 300V Class T
JJN — 300Vac, 1-1200A, Fast-Acting Fuses
1000A
1200A
800A
600A
400A
200A
100A
60A
30A
300
15A
Time-Current Curves - Average Melt
AMP RATING
100
TIME IN SECONDS
10
1
RMS SYMMETRICAL CURRENT IN AMPS
0713
BU-SB13734
Page 2 of 3
10,000
1,000
20
0.01
100
0.1
Data Sheet # 1025
LIMITRON™ 300V Class T
JJN — 300Vac, 1-1200A, Fast-Acting Fuses
Current-Limitation Curves
Custom Designs
Printed circuit board versions available up to 60 amps.
Consult factory for details.
400,000
300,000
Dimensions - in
AMP RATING
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
B
200,000
100,000
80,000
60,000
1.743" (± .020)
1.395" (± .015)
.875" (± .015)
1200
800
600
40,000
30,000
400
200
100
20,000
10,000
8,000
6,000
0.190"MIN.
CL
0.500"
60
30
15
4,000
3,000
A
2,000
1,000
800
600
400
300
B
200,000
60,000
80,000
100,000
30,000
40,000
20,000
6,000
8,000
10,000
3,000
4,000
2,000
600
800
1,000
300
400
200
200
100
A
PROSPECTIVE SHORT-CIRCUIT CURRENT–SYMMETRICAL RMS AMPS
Current-Limiting Effects
Prosp.
Let-Through Current
S.C.C.
(Apparent RMS Symmetrical Vs. Fuse Rating)
15A 30A
60A 100A 200A 400A
600A 800A
500 1000 1000 1000 1000 1000 1000
1000 1000
1000 1000 1000 1000 1000 1000 1000
1000 1000
5000 1000 1000 1000 1000 2000 3000
5000 5000
10,000 1000 1000 1000 2000 2000 4000
6000 7000
15,000 1000 1000 1000 2000 3000 4000
6000 9000
20,000 1000 1000 1000 2000 3000 5000
7000 10,000
25,000 1000 1000 2000 2000 3000 5000
7000 10,000
30,000 1000 1000 2000 2000 3000 5000
8000 11,000
35,000 1000 1000 2000 3000 4000 6000
8000 11,000
40,000 1000 1000 2000 3000 4000 6000
9000 11,000
50,000 1000 1000 2000 3000 4000 7000
9000 12,000
60,000 1000 1000 2000 3000 4000 7000 10,000 13,000
70,000 1000 1000 2000 3000 5000 7000 10,000 14,000
80,000 1000 2000 2000 3000 5000 8000 11,000 15,000
90,000 1000 2000 2000 3000 6000 8000 11,000 15,000
100,000 1000 2000 2000 4000 6000 8000 12,000 16,000
150,000 1000 2000 3000 4000 6000 9000 13,000 17,000
200,000 2000 2000 3000 4000 7000 9000 15,000 19,000
Fuse Amps/Catalog Number
JJN-(1-30)L
JJN-(35-60)L
JJN-(35-60)L-01
A
0.406
0.563
0.563
B
0.125
0.125
0.165
The JJN-XXL products are UL Component Recognized under
Guide JFHR2, File E56412.
1200A
1000
1000
5000
9000
10,000
11,000
12,000
13,000
13,000
13,000
15,000
16,000
17,000
17,000
18,000
19,000
22,000
23,000
The only controlled copy of this Data Sheet is the electronic read-only version located on the Cooper Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin is
intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice, to change
design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any technical information
contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
0713
BU-SB13734
Page 3 of 3
Data Sheet # 1025