0813 BU-SB13XXX Page 1 of 3 Data Sheet # 1006
Low-Peak™ Class J
LPJ — 600Vac/300Vdc, 1-60A, Dual Element, Time-Delay Fuses
Description: Ultimate protection 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.
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 Numbers (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:
Amp Rating Carton Qty.
1–60 10
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.
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
0813 BU-SB13XXX 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
0.1
0.01
TIME IN SECONDS
10A
15A
30A
60A
1000
10
1
CURRENT IN AMPS
200
100
LPJ — 600Vac/300Vdc, 1-60A, Dual Element, Time-Delay Fuses
0813 BU-SB13XXX 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 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. Bussmann reserves the right, without notice, to change design or construction
of any products and to discontinue or limit distribution of any products. 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 AMPS
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
RMS SYMMETRICAL CURRENT IN AMPS
A-B = ASYMMETRICAL AVAILABLE PEAK (2.3 X SYM RMS AMPS)
AMP RATING
LPJ — 600Vac/300Vdc, 1-60A, Dual Element, Time-Delay Fuses
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
