0713 BU-SB13688 Page 1 of 3 Data Sheet # 1006
Low-Peak™ Class J
LPJ — 600Vac/300Vdc, 1-60A, Dual Element, Time-Delay Fuses
Description: Ultra protection Class J dual element, current-
limiting, time-delay fuses available with optional open fuse in-
dication. Time-delay – 10 seconds (minimum) at 500% of
rated current.
Catalog Symbol: LPJ-(amp)SP (non-indicating)
LPJ-(amp)SPI (indicating)
Ratings:
Volts — 600Vac, 300Vdc
Amps — 1-60A
IR — 300kA Vac RMS Sym.
— 100kA Vdc
Agency Information:
CE, UL Listed, Guide JDDZ, File E4273
CSA Certified, Class 1422-02, File 53787,
Class J per CSA 22.2 No. 248.
Catalog Numners (amps) – Non-indicating Fuses
LPJ-1SP LPJ-3SP LPJ-7SP* LPJ-25SP*
LPJ-11⁄4SP LPJ-32⁄10SP LPJ-8SP* LPJ-30SP*
LPJ-16⁄10SP LPJ-31⁄2SP LPJ-9SP* LPJ-35SP*
LPJ-18⁄10SP LPJ-4SP LPJ-10SP* LPJ-40SP*
LPJ-2SP LPJ-41⁄2SP LPJ-12SP* LPJ-45SP*
LPJ-21⁄4SP LPJ-5SP LPJ-15SP* LPJ-50SP*
LPJ-21⁄2SP LPJ-56⁄10SP LPJ-171⁄2SP* LPJ-60SP*
LPJ-28⁄10SP LPJ-6SP* LPJ-20SP*
* Open fuse indication available by inserting the suffix “I,” e.g., LPJ-15SPI.
Requires 75Vac minimum voltage.
Carton Quantity and Weight
Amp Rating Carton Qty.
1–30 10
35–60 10
Dimensions - in
Features:
• Industry’s only UL Listed and CSA Certified fuse with a
300kA Vac interrupting rating that exceeds requirements for
virtually all applications
• Long time-delay minimizes needless fuse openings due to
temporary overloads and transient surges
• Easy selective coordination with all Low-Peak fuses using
simple 2:1 ampacity ratio
• Can often be sized for back-up protection against motor
burnout from overload or single-phasing if other overload
protective devices fail
• High degree of current limitation due to the fast speed-of-
response to short-circuits
• Faster response to damaging short-circuit currents than
mechanical overcurrent protective devices
• Reduces let-through thermal and magnetic forces in order
to protect low withstand rated components
• Proper sizing provides “no damage” Type “2” coordinated
protection for NEMA and IEC motor control in accordance
with IEC Standard 947-4-1
• Dual-element fuses have lower resistance than ordinary
fuses so they run cooler
• Lower watts loss reduces power consumption
• Space-saving package for equipment downsizing
Recommended Fuse Blocks and Holders
Fuse Amps 1-Pole 2-Pole 3-Pole
Open Blocks
0-30 J60030-1 J60030-2 J60030-3
35-60 J60060-1 J60060-2 J60060-3
“Pyramid” Blocks
0-30 JP60030-1 JP60030-2 JP60030-3
35-60 JP60060-1 JP60060-2 JP60060-3
CH Series Holders
0-30 CH30J1 CH30J2 CH30J3
35-60 CH60J1 CH60J2 CH60J3
Safety J™ Holders
0-30 JT60030 ——
35-60 JT60060 ——
For additional information on the Class J fuse blocks and
holders, see data sheets # 1114 (open blocks), #1108
(pyramid blocks), # 2144 (CH Series) and # 1152 (Safety J).
Fuse Reducers For Class R Fuses
Equipment Desired Fuse Catalog Numbers
Fuse Clips (Case) Size (Pairs)
60A 30A J-63
100A 30A J-13
60A J-16
200A 60A J-26†
† Not for bolt-in applications.
2.38"
0.63"
35 to 60A
1.06"
0.5"
1 to 30A
0.81"
2.25"
(±0.03)
(±0.03) (±0.03)
(±0.03)
Available with easyID™
open fuse indication
0713 BU-SB13688 Page 2 of 3 Data Sheet # 1006
Low-Peak™ Class J
Time-Current Curves - Average Melt
AMP RATING
1A
3A
6A
300
100
10
1
.1
.01
TIME IN SECONDS
10A
15A
30A
60A
1,000
10
1
CURRENT IN AMPS
200
100
LPJ — 600Vac/300Vdc, 1-60A, Dual Element, Time-Delay Fuses
0713 BU-SB13688 Page 3 of 3 Data Sheet # 1006
Low-Peak™ Class J
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
B
A
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES
15A
30A
60A
9000
8000
7000
7000
6000
6000
100000
5000
4000
4000
90000
3000
2000
1000
3000
70000
80000
70000
60000
50000
60000
200000
20000
2000
40000
100000
50000
10000
5000
1000
30000
90000
80000
40000
9000
8000
30000
20000
10000
300000
900
800
700
600
500
400
300
200
100
100
400
200
300
700
500
600
900
800
PROSPECTIVE SHORT-CIRCUIT CURRENT - SYMMETRICAL RMS AMPS
AMP RATING
LPJ — 600Vac/300Vdc, 1-60A, Dual Element, Time-Delay 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.
Current-Limiting Effects
Prosp. Let-Through Current
S.C.C. (Apparent RMS Symmetrical Vs. Fuse Rating)
— 15A 30A 60A
1000 1000 1000 1000
3000 1000 1000 1000
5000 1000 1000 1000
10,000 1000 1000 2000
15,000 1000 1000 2000
20,000 1000 1000 2000
25,000 1000 1000 2000
30,000 1000 1000 2000
35,000 1000 1000 2000
40,000 1000 2000 3000
50,000 1000 2000 3000
60,000 1000 2000 3000
80,000 1000 2000 3000
100,000 1000 2000 4000
150,000 1000 2000 4000
200,000 2000 3000 4000
250,000 2000 3000 5000
300,000 2000 3000 5000
