Low Voltage, Branch Circuit Rated Fuses
Low-Peak
®
dual-element, time-delay fuses
LPN-RK_SP (250V) Class RK1
LPS-RK_SP (600V) Class RK1
Now Available
With Optional
Indication
Specifications
Description:
Current-limiting, dual-element,
time-delay fuse; 10 seconds
(minimum) at 500% rated
amps (8 seconds for 0-30A
sizes). Now available with
optional permanent indication
on select ratings (see Catalog
Numbers table).
Dimensions:
See page 11 for Class RK1 dimensions.
Construction:
Copper fuse element.
Ratings:
Volts
LPN-RK:
— 250Vac (or less)
— 125Vdc (0-60A)
— 250Vdc (70-600A)
LPS-RK:
— 600Vac (or less)
— 300Vdc
Amps —
1
⁄
10
-600A
IR — 300,000A RMS Sym.
— 100,000A dc
Agency Information:
CE, UL Listed – Special Purpose*,
Guide JFHR, File E56412, CSA Certified (200,000 AIR),
Class RK1 per CSA C22.2, No. 248.12, Class 1422-02, File
53787.
Features and Benefits
• Separate overload and short-circuit elements provide time
delay for close sizing of high inrush loads linked with K1
current-limitation and selective coordination ratio of 2:1
(within Low-Peak fuse family) prevents widespread
blackouts.
• Inventory consolidation of Class RK1, RK5 and H fuses for
reduced SKU investment and minimizing potential for
misapplying fuse.
• 300,000A RMS symmetrical interrupting rating provides
adequate ratings without obsolescence for all electrical
systems, big or small.
• Insulated end caps reduces exposure to live parts and
extends air gap to distance between blades of adjacent
mounted fuses or to housing.
Data Sheets: LPN-RK — 1003 (0-60) and 1004 (70-600)
LPN-RK with indication — 1066 (70-600)
LPS-RK — 1001 (0-60) and 1002 (70-600)
LPS-RK with indication — 1061 (0-60) and
1064 (70-600)
Typical Applications
• Large Distribution Switchboards
• Power Panelboards
• Motor Control Centers
• Machinery Disconnect Switches
LPN Catalog Numbers (Amps) (250Vac/125Vdc)
LPN-RK-
1
⁄
10
SP
LPN-RK-
15
⁄
100
SP
LPN-RK-
2
⁄
10
SP
LPN-RK-
3
⁄
10
SP
LPN-RK-
4
⁄
10
SP
LPN-RK-
1
⁄
2
SP
LPN-RK-
6
⁄
10
SP
LPN-RK-
8
⁄
10
SP
LPN-RK-1SP
LPN-RK-1
1
⁄
8
SP
LPN-RK-1
1
⁄
4
SP
LPN-RK-1
4
⁄
10
SP
LPN-RK-1
6
⁄
10
SP
LPN-RK-1
8
⁄
10
SP
LPN-RK-2SP
LPN-RK-2
1
⁄
4
SP
LPN-RK-2
1
⁄
2
SP
LPN-RK-2
8
⁄
10
SP
LPN-RK-3SP
LPN-RK-3
2
⁄
10
SP
LPN-RK-3
1
⁄
2
SP
LPN-RK-4SP
LPN-RK-4
1
⁄
2
SP
LPN-RK-5SP
LPN-RK-5
6
⁄
10
SP
LPN-RK-6SP
LPN-RK-6
1
⁄
4
SP
LPN-RK-8SP
LPN-RK-9SP
LPN-RK-10SP
LPN-RK-12SP
LPN-RK-15SP
LPN-RK-17
1
⁄
2
SP
LPN-RK-20SP
LPN-RK-25SP
LPN-RK-30SP
LPN-RK-35SP**
LPN-RK-40SP**
LPN-RK-45SP**
LPN-RK-50SP**
LPN-RK-60SP**
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**
*Meets all performance requirements of UL Standard 248-12 for Class RK1 fuses.
**Available with optional permanent indication. To order, place “I” at end of Catalog Number.
Example: LPN-RK-35SPI.
0-60A fuses available with Nickel plate option. (Ex: LPS-RK30SPNP) 70-600A fuses available
with Tin plate option. Example: LPS-RK-100SP-TP.
LPS Catalog Numbers - (Amps) (600Vac/300Vdc)
LPS-RK-
1
⁄
10
SP
LPS-RK- ⁄
10
SP
LPS-RK-
3
⁄
10
SP
2
LPS-RK-2
1
⁄
2
SP
LPS-RK-2 ⁄
10
SP
LPS-RK-3SP
8
LPS-RK-12SP**
LPS-RK-110SP**
LPS-RK-15SP**
LPS-RK-125SP**
1
LPS-RK-17 ⁄
2
SP** LPS-RK-150SP**
LPS-RK-20SP**
LPS-RK-25SP**
LPS-RK-30SP**
LPS-RK-35SP**
LPS-RK-40SP**
LPS-RK-45SP**
LPS-RK-175SP**
LPS-RK-200SP**
LPS-RK-225SP**
LPS-RK-250SP**
LPS-RK-300SP**
LPS-RK-350SP**
LPS-RK-400SP**
LPS-RK-450SP**
LPS-RK-500SP**
LPS-RK-600SP**
LPS-RK-
4
⁄
10
SP
LPS-RK-
1
⁄
2
SP
LPS-RK-
6
⁄
10
SP
LPS-RK-
8
⁄
10
SP
LPS-RK-1SP
LPS-RK-1
1
⁄
8
SP
LPS-RK-3
2
⁄
10
SP
LPS-RK-3
1
⁄
2
SP
LPS-RK-4SP
LPS-RK-4
1
⁄
2
SP
LPS-RK-5SP
LPS-RK-5
6
⁄
10
SP
LPS-RK-1
1
⁄
4
SP LPS-RK-6SP** LPS-RK-50SP**
LPS-RK-1
4
⁄
10
SP LPS-RK-6
1
⁄
4
SP** LPS-RK-60SP**
LPS-RK-1
1
⁄
2
SP LPS-RK-7SP** LPS-RK-70SP**
LPS-RK-1
6
⁄
10
SP LPS-RK-8SP** LPS-RK-80SP**
LPS-RK-1
8
⁄
10
SP LPS-RK-9SP** LPS-RK-90SP**
LPS-RK-2
1
⁄
4
SP LPS-RK-10SP** LPS-RK-100SP**
*Meets all performance requirements of UL Standard 248-12 for Class RK1 fuses.
**Available with optional permanent replace fuse indication. To order, place “I” at end of
Catalog Number. Example: LPS-RK-15SPI.
Recommended Fuse Holders & Blocks For Class RK1 600V
& 250VFuses
• See page 9
16
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
16
Low Voltage, Branch Circuit Rated Fuses
Low-Peak
®
dual-element, time-delay fuses
Time-Current Characteristic Curves—Average Melt
/
/
1/
1 2
Low Voltage
Branch
Circuit
Fuses
AMPERE RATING
60
100
200
400 600
/
/
/
6
/
10
2 10
3 10
4 10
1 10
300
300
100
100
10
10
TIME IN SECONDS
1
TIME IN SECONDS
1
.1
.1
.1
100
1
1,000
10,000
20
100
.01
CURRENT IN AMPERES
RMS SYMMETRICAL CURRENT IN AMPERES
LPS-RK 600V
20
300
30
60
100
200
AMPERE RATING
3
2
/
10
2
/
10
1
1
/
4
6
1
/
4
10
6
/
10
1
/
2
400 600
15
/
100
1
/
10
8
/
10
1
1
6
/
10
2
1
/
2
4
5
8
12
4
/
10
2
LPS-RK 600V
AMPERE RATING
100
10
TIME IN SECONDS
1
.1
TIME IN SECONDS
3
/
10
.01
1,000
10,000
20
100
CURRENT IN AMPERES
CURRENT IN AMPERES
Recommended Fuse Holders & Blocks For Class RK1 600V
Data Sheets: LPN-RK — 1003 (0-60) and 1004 (70-600)
Data Sheets: LPS-RK — 1001 (0-60) and 1002 (70-600)
& 250VFuses
• See page 9
17
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
1,000
10
.01
3
2
/
10
1
6
/
10
15 20 30
8 10
1 4
2
1
/
2
6
1
/
4
LPN-RK 250V
15 100
/
4
5
8
10
12
1
2
LPN-RK 250V
AMPERE RATING
/
17
Low Voltage, Branch Circuit Rated Fuses
Low-Peak
®
dual-element, time-delay fuses
Current Limitation Curves—LPN-RK (250V)
400,000
B
INSTANTANEOUS PEAK LET-THRU CURRENT IN AMPS
100,000
AMPERE
RATING
600
400
200
100
60
30
Did You Know?
Manhattan’s Biggest Building Project
Protected by Cooper Bussmann
®
Low-Peak
®
Fuses
New York City’s landmark
AOL Time Warner Center is
protected by a vast array of
Cooper Bussmann products.
The $1.7 billion, twin-towered,
glass-walled complex rises
750 feet and measures 2.8
million square feet. The elec-
trical circuit protection system
has 25 switchboards (1200A -
4000A) all containing fusible switches, 500 panel-
boards (100A – 1600A), 75 plug-in busway switches
(100A – 600A), and more than 1900 Cooper
Bussmann Class J Low-Peak® fuses. Cooper
Bussmann LPJ fuses were used because of the
superior series-ratings available using Class J fuses
with downstream circuit breaker panels.
Fuses were selected by the consulting engineer for
all switchboards, power panels and busway switches
because of the high available short circuit currents
and the need for selective coordination of
overcurrent protective devices (a requirement of the
New York City Electrical Code) so the electrical
system does not have a “blackouts.”
10,000
A
10,000
100,000
B
RMS SYMMETRICAL CURRENTS IN AMPERES
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 X SYMM RMS AMPS)
Current Limitation Curves—LPS-RK (600V)
INSTANTANEOUS PEAK LET-THRU CURRENT IN AMPS
200,000
1,000
1,000
Data Sheets: LPN-RK — 1003 (0-60) and 1004 (70-600)
Data Sheets: LPS-RK — 1001 (0-60) and 1002 (70-600)
Recommended Fuse Holders & Blocks For Class RK1 600V
& 250VFuses
• See page 9
18
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
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