Technical Data 1004
Effective August 2018
Supersedes March 2017
LPN-RK — 250 Vac/dc, 70-600 A,
dual element, time-delay fuses
Catalog no.*
LPN-RK-70SP
LPN-RK-80SP
LPN-RK-90SP
LPN-RK-100SP
LPN-RK-110SP
LPN-RK-125SP
LPN-RK-150SP
LPN-RK-175SP
LPN-RK-200SP
LPN-RK-225SP
LPN-RK-250SP
LPN-RK-300SP
LPN-RK-350SP
LPN-RK-400SP
LPN-RK-450SP
LPN-RK-500SP
LPN-RK-600SP
* 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
Typical applications
Catalog symbols:
•
LPN-RK-(amp)SP (non-indicating)
•
LPN-RK-(amp)SPI (indicating)
•
Feeder and branch circuits
•
Transformers
•
Motors
•
Solenoids
•
General purpose circuits
Description:
Features and benefits
Ultimate protection Class RK1 dual element,
current-limiting, time-delay fuses available with
optional open fuse indication.
•
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.
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
LPN-RK — 250 Vac/dc, 70-600 A, dual element, time-delay fuses
Effective August 2018
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
Catalog no. (Pairs)
250V
NO.2621-R
NO.2641-R
NO.642-R
NO.2661-R
NO.2662-R
NO.2664-R†
† Single reducer only (pair not required).
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
2
A
5.88
7.13
8.63
10.38
Eaton.com/bussmannseries
B
1.10
1.61
2.36
2.88
LPN-RK — 250 Vac/dc, 70-600 A, dual element, time-delay fuses
Technical Data 1004
Effective August 2018
Time-current curves - average melt
600
400
200
100
TIME IN SECONDS
60
AMP RATING
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
LPN-RK — 250 Vac/dc, 70-600 A, dual element, time-delay fuses
Effective August 2018
Current-limitation curves
Current-limiting effects
B
Prosp.
S.C.C.
Let-through current (apparent RMS Sym. vs. fuse rating)
—
100 A
200 A
400 A
600 A
1000
1000
1000
1000
1000
2000
2000
2000
2000
2000
3000
2000
3000
3000
3000
5000
2000
3000
5000
5000
50,000
600A
10,000
3000
4000
7000
9000
40,000
400A
15,000
3000
5000
8000
11,000
200A
20,000
3000
5000
8000
11,000
25,000
3000
5000
9000
12,000
100A
30,000
4000
6000
9000
12,000
35,000
4000
6000
10,000
13,000
40,000
4000
6000
10,000
13,000
50,000
4000
7000
11,000
14,000
60,000
4000
7000
11,000
16,000
70,000
4000
7000
12,000
16,000
80,000
5000
8000
12,000
16,000
90,000
5000
7000
13,000
17,000
100,000
5000
8000
13,000
17,000
150,000
6000
9000
15,000
19,000
200,000
6000
11,000
16,000
20,000
250,000
7000
11,000
17,000
21,000
300,000
7000
12,000
18,000
22,000
AMP RATING
400,000
300,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES
200,000
100,000
90,000
80,000
70,000
60,000
30,000
20,000
10,000
9000
8000
7000
6000
5000
4000
3000
A
2000
RMS SYMMETRICAL CURRENT IN AMPS
A-B = ASYMMETRICAL AVAILABLE PEAK (2.3 X SYM RMS AMPS)
300,000
200,000
80,000
100,000
60,000
40,000
30,000
20,000
8000
10,000
6000
4000
3000
2000
1000
1000
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
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. 1004 — BU-SB13687
August 2018
Eaton.com/bussmannseries
Eaton, Bussmann and Low-Peak are valuable
trademarks of Eaton in the U.S. 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.
UL is a registered trademark of the
Underwriters Laboratories, Inc.
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