* Open fuse indication available on all part numbers by
inserting the suffix “I, e.g., LPN-RK-90SPI. Requires 75Vac
”
minimum voltage. Indicating fuses are not Vdc rated.
Carton quantity
•
•
70–100 A: 5
110–600 A: 1
Feeder and branch circuits
Transformers
Motors
Solenoids
General purpose circuits
Industry’s only UL Listed and CSA Certified fuse
with a 300 kA 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.
Time-delay permits 130% FLA sizing for back-up
motor protection.
Current-limitation protects downstream
components against damaging thermal and
magnetic effects of short-circuit currents.
Protects against single-phase motor damage.
Proper sizing can provide “no damage” Type 2
coordinated protection for NEMA and IEC motor
controllers.
Typical applications
•
Catalog symbols:
•
•
•
•
•
•
LPN-RK-(amp)SP (non-indicating)
LPN-RK-(amp)SPI (indicating)
Description:
Ultimate protection Class RK1 dual element,
current-limiting, time-delay fuses available with
optional open fuse indication.
Features and benefits
•
Specifications:
Ratings
•
•
•
•
Volts 250Vac/dc*
Amps 70-600 A
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 RK1 per CSA C22.2 No. 248.12
CE
•
•
•
Technical Data 1004
Effective August 2018
LPN-RK — 250 Vac/dc, 70-600 A, dual element, time-delay fuses
Recommended fuse blocks
Amps
100
200
400
600
Catalog no.
1-Pole
RM25100-1CR
RM25200-1CR
RM25400-1CR
RM25600-1CR
2-Pole
RM25100-2CR
RM25200-2CR
RM25400-2CR
RM25600-2CR
3-Pole
RM25100-3CR
RM25200-3CR
RM25400-3CR
RM25600-3CR
For additional information on the RM Series of 250 volt fuse blocks,
see product brochure # 3192.
Fuse Reducers For Class R Fuses
Desired fuse (case)
Equipment fuse clips size
200 A
100 A
100 A
400 A
200 A
100 A
600 A
200 A
400 A
† Single reducer only (pair not required).
Catalog no. (Pairs)
250V
NO.2621-R
NO.2641-R
NO.642-R
NO.2661-R
NO.2662-R
NO.2664-R†
For additional information on Class R fuse reducers, see data sheet
no. 1118.
Dimensions — in
A
B
Amp rating
70-100
110-200
225-400
450-600
A
5.88
7
.13
8.63
10.38
B
1.10
1.61
2.36
2.88
2
Eaton.com/bussmannseries
LPN-RK — 250 Vac/dc, 70-600 A, dual element, time-delay fuses
Technical Data 1004
Effective August 2018
Time-current curves - average melt
AMP RATING
400
100
200
600
60
TIME IN SECONDS
CURRENT IN AMPS
NOTE: 60 Amp fuse curve is ferrule style and included to show
only relative performance. For actual 60 amp time-current curve
performance, see data sheet no. 1003.
Eaton.com/bussmannseries
3
Technical Data 1004
Effective August 2018
LPN-RK — 250 Vac/dc, 70-600 A, dual element, time-delay fuses
Current-limitation curves
B
300,000
200,000
Current-limiting effects
AMP RATING
400,000
Prosp.
S.C.C.
—
1000
2000
3000
5000
Let-through current (apparent RMS Sym. vs. fuse rating)
100 A
1000
2000
2000
2000
3000
3000
3000
3000
4000
4000
4000
4000
4000
4000
5000
5000
5000
6000
6000
7000
7000
200 A
1000
2000
3000
3000
4000
5000
5000
5000
6000
6000
6000
7000
7000
7000
8000
7000
8000
9000
11,000
11,000
12,000
400 A
1000
2000
3000
5000
7000
8000
8000
9000
9000
10,000
10,000
11,000
11,000
12,000
12,000
13,000
13,000
15,000
16,000
17
,000
18,000
600 A
1000
2000
3000
5000
9000
11,000
11,000
12,000
12,000
13,000
13,000
14,000
16,000
16,000
16,000
17
,000
17
,000
19,000
20,000
21,000
22,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES
100,000
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
600A
400A
200A
100A
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
150,000
10,000
9000
8000
7000
6000
5000
4000
3000
2000
A
1000
100,000
200,000
300,000
10,000
20,000
30,000
40,000
60,000
80,000
1000
2000
4000
6000
3000
8000
200,000
250,000
300,000
RMS SYMMETRICAL CURRENT IN AMPS
A-B = ASYMMETRICAL AVAILABLE PEAK (2.3 X SYM RMS AMPS)
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.
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