Technical Data 1007 Effective August 2018
Supersedes February 2016
Low-Peak™ LPJ Class J 600Vac/300Vdc,
70-600A, dual element, time-delay fuses
Catalog symbols:
• LPJ-(amp)SP (non-indicating)
• LPJ-(amp)SPI (indicating)
Description:
Bussmann® series Ultimate protection LPJ Class
J dual element, current-limiting, time-delay fuses
available with optional open fuse indication. Time-
delay – 10 seconds (minimum) at 500% of rated
current.
Specifications:
Ratings
• Volts
• 600Vac
• 300Vdc*
• Amps 70-600A
• IR
• 300kA Vac RMS Sym.
• 100kA Vdc
* Indicating versions not Vdc rated.
Agency information
• UL® Listed, Guide JDDZ, File E4273
• CSA® Certified, Class 1422-02, File 53787,
Class J per CSA C22.2 No. 248.8
• CE
• RoHS compliant
Available with
easy
ID™
open fuse indication
Catalog numbers (amps) - non-indicating fuses*
LPJ-70SP LPJ-125SP LPJ-250SP LPJ-500SP
LPJ-80SP LPJ-150SP LPJ-300SP LPJ-600SP
LPJ-90SP LPJ-175SP LPJ-350SP
LPJ-100SP LPJ-200SP LPJ-400SP
LPJ-110SP LPJ-225SP LPJ-450SP
* Open fuse indication available on all part numbers by
inserting the suffix “I,” e.g., LPJ-90SPI. Requires 75Vac
minimum voltage. Indicating fuses are not Vdc rated.
Carton Quantity:
Amp rating Carton qty.
70–200 5
225–600 1
Dimensions - in:
Features:
• Industry’s only UL Listed and CSA Certified fuse
with a 300kA interrupting rating that allows for
simple, worry-free installation in virtually any
application.
• Fast short-circuit protection and dual-element,
time-delay performance provide ultimate
protection.
• Reduces existing fuse inventory by up to 33%
when upgrading to Low-Peak fuses.
• Consistent 2:1 ampacity ratios for all Low-Peak
fuses make selective coordination easy.
• Long time-delay minimizes needless fuse openings
due to temporary overloads and transient surges.
• Current-limitation protects downstream
components against damaging thermal and
magnetic effects of short-circuit currents.
• Dual-element fuses have lower resistance than
ordinary fuses so they run cooler.
• Can often be sized for back-up protection against
motor burnout from overload or single-phasing if
other overload protective devices fail.
• Proper sizing can provide “no damage” Type 2
coordinated protection for NEMA® and IEC® motor
controllers.
• Space-saving package for equipment downsizing.
6.0"
8.0"
3.75"
0.69" 2.13" 0.38"
0.53"
2" 2.5"
7.13"
5.25"
3.38"
0.53"
1.63"
1.88"
0.41"
*2"
0.25"
5.75"
4.38"
3.0"
0.38" 1.38"
1.13"
0.28"
0.19"
1.5"
4.63"
3.63"
2.63"
65 to 100A
0.28"
0.75" 1.13"
0.13"
1"
0.38"
110 to 200A
225 to 400A
450 to 600A
2
Technical Data 1007
Effective August 2018
Low-Peak™ LPJ Class J 600Vac/300Vdc, 70-600A,
dual element, time-delay fuses
Eaton.com/bussmannseries
Time-current curves - average melt:
Recommended fuse blocks:
Fuse amps 1-Pole 2-Pole 3-Pole
70-100 JM60100-1CR JM60100-2CR JM60100-3CR
110-200 JM60200-1CR JM60200-2CR JM60200-3CR
225-400 JM60400-1CR JM60400-2CR JM60400-3CR
450-600 JM60600-1CR JM60600-2CR JM60600-3CR
For additional information on the JM fuse blocks, see product
brochure no. 3192.
Fuse reducers for Class J fuses:
Equipment fuse clips
Desired fuse
(case) size
Catalog numbers
(pairs)
100A 30A J-13
60A J-16
200A 60A J-26†
100A J-21†
400A 100A J-41†
200A J-42†
600A 200A J-62†
400A J-64†
† Not for bolt-in applications.
AMP RATING
80A
300
100
10
1
0.1
0.01
TIME IN SECONDS
100A
125A
200A
250A
400A
600A
10,000
1000
100
CURRENT IN AMPS
200
3
Technical Data 1007
Effective August 2018
Low-Peak™ LPJ Class J 600Vac/300Vdc, 70-600A,
dual element, time-delay fuses
Eaton.com/bussmannseries
Current-limitation curves: Current-limiting effects:
Prospective
S.C.C..
Let-through current
(apparent RMS symmetrical vs. fuse rating)
100A 200A 400A 600A
1000 1000 1000 1000 1000
3000 2000 2000 3000 3000
5000 2000 3000 5000 5000
10,000 2000 4000 6000 8000
15,000 3000 4000 7000 9000
20,000 3000 4000 7000 10,000
25,000 3000 5000 8000 10,000
30,000 3000 5000 8000 11,000
35,000 4000 5000 9000 12,000
40,000 4000 6000 9000 12,000
50,000 4000 6000 10,000 13,000
60,000 4000 6000 11,000 14,000
80,000 5000 7000 12,000 15,000
100,000 5000 8000 12,000 17,000
150,000 6000 9000 14,000 19,000
200,000 6000 9000 16,000 21,000
250,000 7000 10,000 17,000 23,000
300,000 7000 11,000 18,000 24,000
B
A
INSTANTANEOUS PEAK-LET-THROUGH CURRENT IN AMPS
100A
200A
400A
600A
9000
8000
7000
7000
6000
6000
100000
5000
4000
4000
90000
3000
2000
1000
3000
70,000
80000
70000
60000
50000
60,000
200,000
20,000
2000
40,000
100,000
50,000
10,000
5000
1000
30,000
90,000
80,000
40000
9000
8000
30000
20000
10000
300,000
900
800
700
600
500
400
300
200
100
100
400
200
300
700
500
600
900
800
RMS SYMMETRICAL CURRENT IN AMPS
A-B = ASYMMETRICAL AVAILABLE PEAK (2.3 X SYM RMS AMPS)
AMP RATING
Low-Peak™ LPJ Class J 600Vac/300Vdc, 70-600A,
dual element, time-delay fuses
Technical Data 1007
Effective August 2018
The only controlled copy of this data sheet is the electronic read-only version located on the Eaton 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. Eaton reserves the right, without notice, to change design or construction of any products and to discontinue or limit
distribution of any products. Eaton 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.
Eaton, Bussmann and Low-Peak are valuable
trademarks of Eaton in the US and other
countries. You are not permitted to use
the Eaton trademarks without prior written
consent of Eaton.
CSA is a registered trademark of the Canadian
Standards Group.
IEC is a registered trademark of the
International Electrotechnical Commission.
NEMA is a registered trademark of the
National Electrical Manufacturers Association.
UL is a registered trademark of the
Underwriters Laboratories, Inc.
Eaton
1000 Eaton Boulevard
Cleveland, OH 44122
Eaton.com
Bussmann Division
114 Old State Road
Ellisville, MO 63021
United States
Eaton.com/bussmannseries
© 2018 Eaton
All Rights Reserved
Printed in USA
Publication No. 1007 — BU-SB13689
August 2018
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