Technical Data 1002 Effective August 2018
Supersedes March 2017
LPS-RK — 600 Vac/300 Vdc, 70-600 A,
dual element, time-delay fuses
Catalog symbols:
• LPS-RK-(amp)SP (non-indicating)
• LPS-RK-(amp)SPI (indicating)
Description: Ultimate protection Class RK1 current-
limiting, dual element, time-delay fuses available
with optional open fuse indication.
Specifications:
Ratings
• Volts
• 600 Vac
• 300 Vdc*
• Amps 70-600 A
• IR
• 300 kA Vac RMS Sym.
• 100 kA 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
Catalog no.*
LPS-RK-70SP LPS-RK-150SP LPS-RK-350SP
LPS-RK-80SP LPS-RK-175SP LPS-RK-400SP
LPS-RK-90SP LPS-RK-200SP LPS-RK-450SP
LPS-RK-100SP LPS-RK-225SP LPS-RK-500SP
LPS-RK-110SP LPS-RK-250SP LPS-RK-600SP
LPS-RK-125SP LPS-RK-300SP
* Open fuse indication available on all part numbers by
inserting the suffix “I,” e.g., LPS-RK-90SPI. Requires 75Vac
minimum voltage. Indicating fuses are not Vdc rated.
Carton quantity
• 1
Typical applications
• Feeder and branch circuits
• Motors
• Transformers
• Solenoids
• General purpose circuits
Features and benefits
• 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 protec-
tion.
• 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 compo-
nents 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.
2
Technical Data 1002
Effective August 2018
LPS-RK — 600 Vac/300 Vdc, 70-600 A, dual element, time-delay fuses
Eaton.com/bussmannseries
Recommended fuse blocks
Amps
Catalog no.
1-Pole 2-Pole 3-Pole
100 RM60100-1CR RM60100-2CR RM60100-3CR
200 RM60200-1CR RM60200-2CR RM60200-3CR
400 RM60400-1CR RM60400-2CR RM60400-3CR
600 RM60600-1CR RM60600-2CR RM60100-3CR
For additional information on the RM600 600 volt fuse blocks, see
product brochure no. 3192.
Fuse reducers for Class R fuses
Equipment fuse clips
Desired fuse (case)
size
Catalog no. (pairs)
600V
200 A 100 A NO.2621-R
400 A 100 A NO.2641-R
200 A NO.642-R
600 A
100 A NO.2661-R
200 A NO.2662-R
400 A NO.2664-R†
† Single reducer only (pair not required).
For additional information on Class R fuse reducers, see data sheet
no. 1118.
Dimensions — in
Fuse amps A B
70-100 7.88 1. 11
110-200 9.63 1.61
225-400 11.63 2.36
450-600 13.38 2.88
A
B
Current-limitation curves
B
A
600A
400A
200A
100A
AMP RATING
400,000
100,000
1000
INSTANTANEOUS PEAK-LET-THROUGH CURRENT IN AMPS
200,000
RMS SYMMETRICAL CURRENT IN AMPS
A-B = ASYMMETRICAL AVAILABLE PEAK (2.3 X SYM RMS AMPS)
100,000
10,000
1000
10,000
300,000
Current-limiting effects
Prosp. S.C.C. Let-through current (apparent RMS Sym. vs. fuse rating)
—100A 200A 400A 600A
1000 1000 1000 1000 1000
2000 2000 2000 2000 2000
3000 2000 3000 3000 3000
5000 2000 3000 5000 5000
10,000 3000 4000 7000 10,000
15,000 3000 5000 8000 11,000
20,000 3000 5000 9000 12,000
25,000 4000 6000 9000 12,000
30,000 4000 6000 10,000 13,000
35,000 4000 6000 10,000 13,000
40,000 4000 6000 10,000 14,000
50,000 5000 7000 11,000 15,000
60,000 5000 7000 12,000 15,000
70,000 5000 8000 13,000 16,000
80,000 5000 8000 13,000 16,000
90,000 5000 8000 13,000 17,000
100,000 6000 9000 14,000 17,000
150,000 6000 10,000 15,000 19,000
200,000 7000 11,000 16,000 21,000
250,000 7000 12,000 17,000 22,000
300,000 7000 12,000 18,000 23,000
3
Technical Data 1002
Effective August 2018
LPS-RK — 600 Vac/300 Vdc, 70-600 A, dual element, time-delay fuses
Eaton.com/bussmannseries
Time-current curves - average melt
Eaton.com/bussmannseries
LPS-RK — 600 Vac/300 Vdc, 70-600 A, dual element, time-delay fuses
Technical Data 1002
Effective August 2018
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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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Underwriters Laboratories, Inc.
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Printed in USA
Publication No. 1002 — BU-SB13685
August 2018