0713 BU-SB13734 Page 1 of 3 Data Sheet # 1025
LIMITRON™ 300V Class T
JJN — 300Vac, 1-1200A, Fast-Acting Fuses
Description: Advanced protection Class T current -limiting,
fast-acting fuses.
Catalog Symbol: JJN-(amp)
Ratings:
Volts — 300Vac (1-10A)
— 300Vac, 160Vdc (15-600A)
— 300Vac, 170Vdc (700-1200A)
Amps — 1-1200A
IR — 200kA Vac RMS Sym.
— 20kA Vdc (15-600A)
— 100kA Vdc (700-1200A)
Agency Information:
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)
JJN-1 JJN-50 JJN-250
JJN-2 JJN-60 JJN-300
JJN-3 JJN-70 JJN-350
JJN-6 JJN-80 JJN-400
JJN-10 JJN-90 JJN-450
JJN-15 JJN-100 JJN-500
JJN-20 JJN-110 JJN-600
JJN-25 JJN-125 JJN-700
JJN-30 JJN-150 JJN-800
JJN-35 JJN-175 JJN-1000
JJN-40 JJN-200 JJN-1200
JJN-45 JJN-225
Carton Quantity and Weight
Amp Rating Carton Qty.
1–30 10
35–60 10
70–100 5
110–200 1
225–400 1
450–600 1
700–800 1
1000–1200 1
Dimensions – in
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 1-Poles 2-Pole 3-Pole 4-Pole
½-30 — T30030-2_ T30030-3_ T30030-4_
35-60 — T30060-2_ T30060-3_ T30060-4_
70-100 — T30100-1_ T30100-2_ T30100-3_
110-200 T30200-1_ ———
200 1B0083 ———
225-400 T30400-1_ ———
450- 600 T30600-1_ ———
For additional information on 300 volt Class T fuse blocks, see
Data Sheet # 1115.
0.84"
0.86"
1 to 30A
35 to 60A
2.75"
( 0.04)
1.84"
1"
( 0.04)
0.75"
( 0.02)
0.56" Dia.
( 0.02)
.41" Dia.
( 0.02)
0.88"
( 0.02)
0.88"
( 0.02)
2.16"
( 0.02)
1.56"
70 to 100A
0.84"
2.44"
( 0.02)
1.69"
0.88"
( 0.02)
110 to 200A
225 to 400A
0.88"
0.92"
1.08"
2.53"
4"
( 0.04)
2"
( 0.04)
2.22"
3.38"
( 0.04)
1.75"
( 0.04)
801 to 1200A
601 to 800A
450 to 600A
2.03"
1.25"
( 0.04)
0.484"
(Typ. 2)
3.06"
( 0.04)
0.284"
(Typ. 2)
0.562"
(Typ. 2)
0.609"
(Typ. 2)
0.406"
(Typ. 2)
0.344"
(Typ. 2)
0713 BU-SB13734 Page 2 of 3 Data Sheet # 1025
LIMITRON™ 300V Class T
Time-Current Curves - Average Melt
RMS SYMMETRICAL CURRENT IN AMPS
TIME IN SECONDS
20
100
1,000
10,000
300
100
10
1
0.1
0.01
60A
100A
200A
30A
400A
AMP RATING
600A
15A
800A
1000A
1200A
JJN — 300Vac, 1-1200A, Fast-Acting Fuses
0713 BU-SB13734 Page 3 of 3 Data Sheet # 1025
LIMITRON™ 300V Class T
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.
Current-Limitation Curves Custom Designs
Printed circuit board versions available up to 60 amps.
Consult factory for details.
Dimensions - in
100,000
80,000
60,000
40,000
30,000
20,000
10,000
8,000
6,000
4,000
3,000
2,000
1,000
800
600
400
300
200
100
200
300
400
600
800
1,000
2,000
3,000
4,000
6,000
8,000
10,000
20,000
30,000
40,000
60,000
80,000
100,000
200,000
200,000
400,000
300,000
600
400
200
100
60
30
15
AMP RATING
800
1200
B
A
PROSPECTIVE SHORT-CIRCUIT CURRENT–SYMMETRICAL RMS AMPS
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
JJN — 300Vac, 1-1200A, Fast-Acting Fuses
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.
Fuse Amps/Catalog Number AB
JJN-(1-30)L 0.406 0.125
JJN-(35-60)L 0.563 0.125
JJN-(35-60)L-01 0.563 0.165
The JJN-XXL products are UL Component Recognized under
Guide JFHR2, File E56412.
A
B
0.500"
0.190"MIN.
1.743" (± .020)
1.395" (± .015)
.875" (± .015)
C
L
Current-Limiting Effects
Prosp. Let-Through Current
S.C.C. (Apparent RMS Symmetrical Vs. Fuse Rating)
15A 30A 60A 100A 200A 400A 600A 800A 1200A
500 1000 1000 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 5000
10,000 1000 1000 1000 2000 2000 4000 6000 7000 9000
15,000 1000 1000 1000 2000 3000 4000 6000 9000 10,000
20,000 1000 1000 1000 2000 3000 5000 7000 10,000 11,000
25,000 1000 1000 2000 2000 3000 5000 7000 10,000 12,000
30,000 1000 1000 2000 2000 3000 5000 8000 11,000 13,000
35,000 1000 1000 2000 3000 4000 6000 8000 11,000 13,000
40,000 1000 1000 2000 3000 4000 6000 9000 11,000 13,000
50,000 1000 1000 2000 3000 4000 7000 9000 12,000 15,000
60,000 1000 1000 2000 3000 4000 7000 10,000 13,000 16,000
70,000 1000 1000 2000 3000 5000 7000 10,000 14,000 17,000
80,000 1000 2000 2000 3000 5000 8000 11,000 15,000 17,000
90,000 1000 2000 2000 3000 6000 8000 11,000 15,000 18,000
100,000 1000 2000 2000 4000 6000 8000 12,000 16,000 19,000
150,000 1000 2000 3000 4000 6000 9000 13,000 17,000 22,000
200,000 2000 2000 3000 4000 7000 9000 15,000 19,000 23,000