For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
16
Low Voltage, Branch Circuit Rated Fuses
16
Typical Applications
• Large Distribution Switchboards
• Power Panelboards
• Motor Control Centers
• Machinery Disconnect Switches
LPN Catalog Numbers (Amps) (250Vac/125Vdc)
LPN-RK-1⁄10SP LPN-RK-3 1⁄2SP LPN-RK-60SP**
LPN-RK-15⁄100SP LPN-RK-4SP LPN-RK-70SP****
LPN-RK-2⁄10SP LPN-RK-4 1⁄2SP LPN-RK-80SP**
LPN-RK-3⁄10SP LPN-RK-5SP LPN-RK-90SP**
LPN-RK-4⁄10SP LPN-RK-5 6⁄10SP LPN-RK-100SP**
LPN-RK-1⁄2SP LPN-RK-6SP LPN-RK-110SP**
LPN-RK-6⁄10SP LPN-RK-6 1⁄4SP LPN-RK-125SP**
LPN-RK-8⁄10SP LPN-RK-8SP LPN-RK-150SP**
LPN-RK-1SP LPN-RK-9SP LPN-RK-175SP**
LPN-RK-1 1⁄8SP LPN-RK-10SP LPN-RK-200SP**
LPN-RK-1 1⁄4SP LPN-RK-12SP LPN-RK-225SP**
LPN-RK-1 4⁄10SP LPN-RK-15SP LPN-RK-250SP**
LPN-RK-1 6⁄10SP LPN-RK-17 1⁄2SP LPN-RK-300SP**
LPN-RK-1 8⁄10SP LPN-RK-20SP LPN-RK-350SP**
LPN-RK-2SP LPN-RK-25SP LPN-RK-400SP**
LPN-RK-2 1⁄4SP LPN-RK-30SP LPN-RK-450SP**
LPN-RK-2 1⁄2SP LPN-RK-35SP** LPN-RK-500SP**
LPN-RK-2 8⁄10SP LPN-RK-40SP** LPN-RK-600SP**
LPN-RK-3SP LPN-RK-45SP**
LPN-RK-3 2⁄10SP LPN-RK-50SP**
*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-1⁄10SP LPS-RK-2 1⁄2SP LPS-RK-12SP** LPS-RK-110SP**
LPS-RK-2⁄10SP LPS-RK-2 8⁄10SP LPS-RK-15SP** LPS-RK-125SP**
LPS-RK-3⁄10SP LPS-RK-3SP LPS-RK-17 1⁄2SP** LPS-RK-150SP**
LPS-RK-4⁄10SP LPS-RK-3 2⁄10SP LPS-RK-20SP** LPS-RK-175SP**
LPS-RK-1⁄2SP LPS-RK-3 1⁄2SP LPS-RK-25SP** LPS-RK-200SP**
LPS-RK-6⁄10SP LPS-RK-4SP LPS-RK-30SP** LPS-RK-225SP**
LPS-RK-8⁄10SP LPS-RK-4 1⁄2SP LPS-RK-35SP** LPS-RK-250SP**
LPS-RK-1SP LPS-RK-5SP LPS-RK-40SP** LPS-RK-300SP**
LPS-RK-1 1⁄8SP LPS-RK-5 6⁄10SP LPS-RK-45SP** LPS-RK-350SP**
LPS-RK-1 1⁄4SP LPS-RK-6SP** LPS-RK-50SP** LPS-RK-400SP**
LPS-RK-1 4⁄10SP LPS-RK-6 1⁄4SP** LPS-RK-60SP** LPS-RK-450SP**
LPS-RK-1 1⁄2SP LPS-RK-7SP** LPS-RK-70SP** LPS-RK-500SP**
LPS-RK-1 6⁄10SP LPS-RK-8SP** LPS-RK-80SP** LPS-RK-600SP**
LPS-RK-1 8⁄10SP LPS-RK-9SP** LPS-RK-90SP**
LPS-RK-2 1⁄4SP 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.
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)
Recommended Fuse Holders & Blocks For Class RK1 600V
& 250VFuses
• See page 9
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp 17
Low Voltage, Branch Circuit Rated Fuses
Low Voltage
Branch
Circuit
Fuses
17
Low-Peak®dual-element, time-delay fuses
Time-Current Characteristic Curves—Average Melt
TIME IN SECONDS
CURRENT IN AMPERES
AMPERE RATING
300
100
10
1
.1
.01
20
100
1,000
10,000
15 20 30 60 100 200 400 600
LPN-RK 250V
TIME IN SECONDS
CURRENT IN AMPERES
AMPERE RATING
300
100
10
1
.1
.01
20
100
1,000
10,000
20 30 60 100 200 400 600
LPS-RK 600V
1
2
4
5
8
10
12
AMPERE RATING
300
100
10
1
.1
.01
.1
1
10
100
1,000
TIME IN SECONDS
RMS SYMMETRICAL CURRENT IN AMPERES
1/10 15/100
2/10
3/10
4/10 1/2
6/10 8/10
11/4
16/10
21/2
32/10
61/4
LPN-RK 250V
1/10
15/100
2/10
4/10
6/10
16/10
8/10
1
2
4
5
8
12
10
11/4
21/232/10
61/4
1/2
3/10
LPS-RK 600V
TIME IN SECONDS
CURRENT IN AMPERES
AMPERE RATING
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
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
18
Low Voltage, Branch Circuit Rated Fuses
A
B
600
400
200
100
AMPERE
RATING
400,000
100,000
10,000
1,000
1,000
10,000
100,000
200,000
RMS SYMMETRICAL CURRENTS IN AMPERES
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 X SYMM RMS AMPS)
INSTANTANEOUS PEAK LET-THRU CURRENT IN AMPS
60
30
Current Limitation Curves—LPN-RK (250V)
B
INSTANTANEOUS PEAK LET-THRU CURRENT IN AMPS
Current Limitation Curves—LPS-RK (600V)
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
Low-Peak®dual-element, time-delay fuses
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.”
Did You Know?
