™
®
Bussmann Introduces the Only Total System Fuse…LOW-PEAK YELLOW *
®
• System 300…Specification grade.
The only total system fuse. 1/10
through 6000 amperes.
Main Distribution Switchboard
• Simplifies selection.
• 300,000 ampere interrupting
rating (LP-CC has a 200,000
ampere interrupting rating).
G.F.P.
Main Distribution Switchboard
• Meets future needs when
available short-circuit current
increases as a result of expansion
of building system or utility.
• Provides maximum current
limiting action. Keeps short-circuit
currents low. Gives protection to
NEMA and IEC motor starters.
KRP-C_SP
• Low 2:1 coordination ratios for
improved selective coordination.
Fused Main Switch with
Ground Fault Protection
• Color yellow. Easy visual confirmation of the “right” fuse installation.
Feeder for MCC
Feeder for
Distribution
Panel
Branch for
Large Motor
Feeder for
MLO Lighting
Panel
Feeder for
Combination
Starters
Branch for
Resistance
Load
• Rejection features.
• Cuts spare fuse inventories for
substantial cost reduction.
LPJ_SP
• The Complete Line
—LOW-PEAK® YELLOW™
Symbol
KRP-C_SP
LPS-RK_SP
LPN-RK_SP
LPJ_SP
LP_CC
Volts
600
600
250
600
600
LPJ_SP
LPJ_SP
LPJ_SP
LPJ_SP
LPS-RK_SP
LPS-RK_SP
Amperes
601-6000
1/10 - 600
Dimension
Class
Pg.
L
6
R
8
1- 600
1/2 - 30
J
CC
KRP-C_SP
LPS-RK_SP
LPS-RK_SP
LPS-RK_SP
12
14
DP1
Motor Control Center
MCC Bucket
RESISTANCE
LOAD
MCC
Reduced
Voltage Starter
for Large Motor
LPJ_SP
LPJ_SP
LPS-RK_SP
LPS-RK_SP
CB’S
M
NEMA
Combination
Starter
(or IEC Starter)
Fused
Safety
Switch
M
M
2
M
*The color YELLOW for fuses is a registered trademark of Cooper Industries, Inc.
3
Bussmann
®
Simplifies Design
of Protective System
The Buss® LOW-PEAK® series of yellow fuses
now gives the designer of low voltage power
distribution systems a series of protective
devices which simplify the task of selecting
and specifying fusing for total system protection of circuit components against both overload and fault currents.
This system of LOW-PEAK® YELLOW™
fuses covers applications requiring fuses rated
1
/10 A through 6000A at 600 volts ac and
interrupting ratings through 300,000
amperes. The LPS-RK (600V) and LPN-RK
(250V) are available from 1/10 A through
600A with a Class RK1 dimension. The LPJ
(600V) is a Class J dimension fuse available
from 1A through 600A. The LP-CC (600V)
Class CC fuse is available from 1/2 A through
30A. To round out the system the KRP-C
(600V) is a Class L dimension fuse available
from 601A through 6000A.
Inventory Savings
If your plant or building currently uses fuses,
then there is a good chance that adoption of
Bussmann’s SYSTEM 300 series of fuses will
provide a reduction in the number of fuses
carried as spares. Over 47 different fuse types
in the 0-600 ampere range alone can be
replaced by LOW-PEAK fuses.
Safety
Even though many different fuses fall into
common classifications (and the same physical
sizes), they have many different performance
characteristics. Even fuses that meet the
requirements of a particular standard, but are
manufactured by different fuse manufacturers, have different levels of performance.
Therefore, it is important that in any
single application that all fuses meet the same
standard and are supplied by one manufacturer. Bussmann’s LOW-PEAK fuses provide
the user with an easily identifiable (yellow)
overcurrent protective device that will provide
maximum protection (when properly applied)
in their electrical system.
300,000 Ampere
Interrupting Rating
A protective device must be able to withstand the destructive energy of short-circuit
currents. If a fault occurs at a level beyond
the capability of the protective device, the
device may actually rupture, causing damage
to surrounding components and unnecessary
down time.
Several areas in North America have
available short-circuit currents in excess of
200,000 amperes and as power requirements
4
grow, the trend is toward increasing available
fault currents. The use of Bussmann’s System
300 assures that the overcurrent protective
devices not only meet today’s requirements,
but help insure that future growth will not
obsolete your electrical system.
Improved Selective Coordination
The application of a multiplicity of various
type fuses within the total distribution system,
from main to feeders to branches, complicates
formulation of positive selective coordination.
In all circuits up through 6000 amperes, the
use of only a single type fuse (specifically
Bussmann LOW-PEAK YELLOW) simplifies
selective coordination and eliminates needless blackouts of upstream circuits.
No Maintenance or
Recalibration
The LOW-PEAK fuse is a static device. Its
functional elements are enclosed within a
highly protective casing. Operation remains
reliable and consistent over many years.
Component Short-Circuit
Protection
Per NEC® 110.10, protective devices shall
clear a fault without “extensive damage” to the
circuit components. Aside from the cost of
equipment repair or replacement, the cost of
downtime in a commercial or industrial complex can be considerable. By code standards,
nominal or minimal protection of components
is mandatory. The use of protective devices
which reduce fault currents to or below the
limits of “component withstand” ratings
affords NEC® compliance. However, limiting
damage or deterioration of a component to an
absolute minimum by applying fuses with the
greatest degree of current-limitation should be
a prime objective. LOW-PEAK fuses are
designed to provide this high degree of current-limitation.
Some of the major components found
in distribution systems that have component
withstand ratings established (maximum
level of fault currents that will not seriously
damage or destroy the component) include
the following:
Wire and Cable
Bus (all bus structures)
Transformers
Motor Starters—NEMA and IEC
Circuit Breakers
Switches
Contactors
Overload Heater Elements
Ballasts
The withstand ratings can be expressed
in terms of RMS current values, time inter-
vals of fault currents, and the maximum
peak current to which they can be subjected.
(Component withstand data is given in
Bussmann technical publication, “Selecting
Protective Devices Based on the National
Electrical Code” bulletin SPD.
Knowing the withstand rating of a
component, the proper selection of a protective fuse can be easily determined by reference to a Current-Limiting Graph or Table.
Note: In most cases, fuse selection made
in accordance with loads will provide
proper protection.
Motor and Motor Starter
Protection
When used in circuits with surge currents
such as those caused by motors (or other
inductive components, like transformers)
the Buss LOW-PEAK YELLOW family of
fuses can be sized close to full load current
to give optimum overcurrent protection.
Generally, two levels of overcurrent protection are required for motor branch circuits:
short-circuit protection and overload protection. (For more detailed information about
motor circuit protection see Buss publication
bulletin SPD).
Motor Branch Circuit Protection
(Short-Circuit Protection Only)
LOW-PEAK fuses help protect motor circuit
components such as conductors, switches,
overload relays, and motor starters against
short-circuits or ground faults. Sizing must
be in accordance with NEC® Table
430.52 and Section 430.52.
Motor Starter Protection
Motor starters are very susceptible to damage
from short-circuits. Even for moderate or
low-level faults, extensive damage may occur
unless the short-circuit protective device is
carefully selected. The most vulnerable components of the motor starter are the contacts
and overload relays. Specific standards (UL
508 and IEC 60947-4-1) have test procedures which determine whether a motor
starter can safely withstand specific levels
of fault currents. However, the standards do
not always define the level of protection provided and, in some cases, even significant
damage is considered acceptable.
IEC Publication 60947-4-1 defines a
level of protection called “Type 2”, (no damage protection). IEC or NEMA devices can and
should be tested to this level of protection to
provide the maximum degree of motor
starter protection. (Consult your local
Bussmann Sales Engineer for more detailed
information).
Features/Benefits
Motor Running Back-Up
Protection
Many installations utilize overload heaters and
relays with motor controllers to provide motor
running overload protection. LOW-PEAK®
fuses, sized one size larger than the overload
relays, provide a good second line of overload
protection as well as branch circuit protection. Normally, any overload condition is
sensed and cleared by the overload heaters in
conjunction with the controller. However, if
for some reason the heaters or the controller
fail to function, LOW-PEAK fuses sized for
“back-up” protection help prevent the motor
from burning out.
Large Motor Branch Circuit
Protection
The application of time delay LOW-PEAK
KRP-C fuses is recommended for the protection of large motors drawing more than 500
amperes. KRP-C LOW-PEAK fuses can pass
normal inrush currents without nuisance
openings. Sizing should be 175% of motor
full-load current.
Guide to Proper Fuse Selection
For easy fuse sizing guidelines, refer to the
motor protection tables of Buss publication
bulletin SPD.
*Recommended Fuse Size for Motor Short-Circuit and Back-Up
Overload Protection (LPN-RK_SP/LPS-RK_SP)
Fuse
Motor
Fuse
Motor
Size
Amperes
Size
Amperes
⁄Ω¡º
0.0000-0.0769
8
5.385-6.153
⁄Ω•
0.0770-0.0961
9
6.154-6.923
⁄fiΩ¡ºº
0.0962-0.1153
10
6.924-7.692
¤Ω¡º
0.1154-0.1538
12
7.693-9.230
⁄Ω¢
0.1539-0.1923
15
9.231-11.53
‹Ω¡º
0.1924-0.2307
17⁄Ω™
11.54-13.46
›Ω¡º
0.2308-0.3076
20
13.47-15.38
⁄Ω™
0.3077-0.3846
25
15.39-19.23
flꭧ
0.3847-0.4615
30
19.24-23.07
°Ω¡º
0.4616-0.6153
35
23.08-26.92
1
0.6154-0.7692
40
26.93-30.76
1⁄Ω•
0.7693-0.8653
45
30.77-34.61
1⁄Ω¢
0.8654-0.9615
50
34.62-38.46
1›Ω¡º
0.9616-1.076
60
38.47-46.15
1⁄Ω™
1.077-1.153
70
46.16-53.84
1flꭧ
1.154-1.230
80
53.85-61.53
1°Ω¡º
1.231-1.384
90
61.54-69.23
2
1.385-1.538
100
69.24-76.92
2⁄Ω¢
1.539-1.730
110
76.93-84.61
2⁄Ω™
1.731-1.923
125
84.62-96.15
2°Ω¡º
1.924-2.153
150
96.16-115.3
3
2.154-2.307
175
115.4-134.6
3 ¤Ω¡º
2.308-2.461
200
134.7-153.8
3⁄Ω™
2.462-2.692
225
153.9-173.0
4
2.693-3.076
250
173.1-192.3
4⁄Ω™
3.077-3.461
300
192.4-230.7
5
3.462-3.846
350
230.8-269.2
5flꭧ
3.847-4.307
400
269.3-307.6
6
4.308-4.615
450
307.7-346.1
6⁄Ω¢
4.616-4.807
500
346.2-384.6
7
4.808-5.384
600
384.7-461.5
• Determine “motor amperes” at normal full load (FLA) preferably with a meter. Use nameplate rating,
or refer to NEC®.
• See Buss® Bulletin “SPD” for Special Operating Conditions.
• 1.15 or greater service factor motor.
Bussmann World Wide Web ~ http://www.bussmann.com
400 AMP
SWITCH
300 AMP
ONE-TIME
OR RENEWABLE FUSE
200 AMP
SWITCH
150A
LOW-PEAK
YELLOW
FUSE
MOTOR
STARTER
WITH
OVERLOAD
RELAYS
MOTOR
STARTER
WITH
OVERLOAD
RELAYS
F.L.A.100
F.L.A.100
The time-delay of LOW-PEAK® fuses permits closer sizing
of fuses…the use of smaller size fuses. As shown in this
illustration, the use of smaller size fuses, in turn, affords
the application of equipment with lower ampacity ratings.
Now you can get current information about
Bussmann products at anytime, using BIF
(Bussmann Information FAX) or visit us on
the World Wide Web.
BIF is a simple to use automated fax response system. All you need is
a touch-tone telephone and a fax machine to get complete product
specifications when you want them. Data sheet numbers are located
throughout this catalog. To get a detailed data sheet on the product
of your choice, simply dial 636-527-1450 and request the document
number listed. In a matter of minutes a data sheet will be faxed to
you. It’s that simple.
Data sheets can also be downloaded from the Internet. The
Bussmann web site is continuously updated with our newest products
and latest data on circuit protection solutions. Visit us often at
http://www.bussmann.com
©2002 Cooper Bussmann
Printed in U.S.A.
5
Bussmann
®
he all-purpose silver linked fuse
for both overload and short-circuit
protection of high capacity systems
(mains and large feeders) with
time-delay (minimum of four seconds at five times amp rating) for
close sizing. Unlike fast-acting fuses,
LOW-PEAK® fuses pass harmless surge
currents of motors, transformers, etc.,
without overfusing or sacrificing shortcircuit current-limitation (component
protection). The combination use of 1/10
to 600 ampere LOW-PEAK YELLOW™
dual-element time-delay fuses (LPNRK_SP, LPS-RK_SP, LPJ_SP) and 601 to
6000A KRP-C_SP LOW-PEAK YELLOW
fuses is recommended as a total system
specification. Easily selectively coordinated for blackout protection. Size of
upstream fuse need only be twice that of
downstream LOW-PEAK fuses (2:1
ratio). LOW-PEAK fuses can reduce bus
bracing, protect circuit breakers with
low interrupting ratings, as well as provide excellent overall protection.
T
KRP-C
601-6000A
CATALOG SYMBOL:
KRP-C_SP 600V AC 601-6000
300V DC 601-2000
TIME-DELAY:
4 SECONDS (MINIMUM)
AT 500% RATED CURRENT
601 THROUGH 6000 AMPERES
600 VOLTS AC (OR LESS)
CURRENT-LIMITING
INTERRUPTING RATING:
300,000 (AC) / 100,000 (DC)
AGENCY INFORMATION:
UL LISTED–SPECIAL PURPOSE*
(Guide #JFHR, File #E56412)
CSA Class L (200,000AIR)
(Class #1422-02; File #53787)
DATA SHEET NUMBERS:
KRP-C (601-6000)SP
Data sheet #1008, 1009
636.527.1450
6
Time-Delay Permits Close
Fuse Sizing for Optimum
Circuit Protection
LOW-PEAK fuses have at least a four
second time-delay at 500% of rating.
Motor starting currents, transformer
magnetizing currents, and other harmless current surges do not cause LOWPEAK fuses to nuisance open even
though sized close to the continuous,
full-load circuit current. There’s little
need to compromise good fuse protection by fuse oversizing. Unnecessary
fuse oversizing may result in a considerable increase in short-circuit let-through
currents… allowing more damaging letthrough energy.
Bus Bracing
Current-limiting action of the fuse generally affords considerable reduction in
bus bracing. For example, if the available short-circuit current was 50,000A
and the applicable fuse size was 2000A,
reference to the current-limiting table
(see time-current and current-limitation
curves on next page) shows that the
busway would only be subject to
32,000A RMS symmetrical.
High Interrupting Rating
These fuses have the maximum interrupting rating of 300,000 amperes.
This rating affords compliance with
NEC® Section 110.9 in today’s large
capacity systems, helps meet the
requirements of future system expansion
and increases in available utility shortcircuit current.
* Special purpose rating of 300,000 AIR. Meets all performance
requirements for UL Standard 248-10 for Class L fuses.
Fuse Construction
O-Ring Seals
Formation of arc gas within fuse
body suppresses arcing; lowers
arcing I2t energy. O-ring seals
maximize pressure build-up during current-limiting action. Also
volume of sand is critical. Slight
sand loss can adversely impact
current-limiting abilities. O-ring
seals insure filler retention. They
compensate to a degree for
switchgear misalignment, and
expansion and contraction of
mounting surfaces with change
in load to no-load conditions.
99.9% Pure Silver
Fuselinks
Embody “silver-sand” design.
99.9% pure silver links; silicasand filler. The high conductivity
of silver gives low watt loss and
low operating temperature at
normal current levels; minimizes
total clearing I2t fault energy letthrough... state-of-the-art fuse
design. A high degree of current-limitation holds down fault
currents and levels of destructive
energy. (Although other link
materials can provide currentlimitation, they do not equal
that of silver).
Sand Filler
High grade silica-sand filler.
Accelerates response of fuse to
short-circuits by having quenching effect upon the fuse arc.
Substantially contributes to current-limiting action.
300
Catalog
Number
Weight*
Ctn.
Qty.
Lbs.
Kg.
KRP-C-601SP
1008, 1009
KRP-C-1900SP
KRP-C-700SP
1
3.75
1.7
KRP-C-2001SP
KRP-C-800SP
KRP-C-2400SP
KRP-C-801SP
KRP-C-2500SP
KRP-C-3000SP
KRP-C-1000SP
1
4.5
2.041
Lbs.
Kg.
1
8.5
3.85
1
17.25
7.824
1
18.25
8.278
1
23.50
10.659
1
29
13.154
1
36
16.329
KRP-C-3500SP
KRP-C-1100SP
KRP-C-3800SP
KRP-C-1200SP
KRP-C-4000SP
KRP-C-1350SP
KRP-C-4500SP
KRP-C-1400SP
1
KRP-C-1500SP
1
Weight*
Ctn.
Qty.
KRP-C-2000SP
KRP-C-750SP
KRP-C-900SP
10
Catalog
Number
KRP-C-1800SP
KRP-C-650SP
100
TIME IN SECONDS
601–6000A
Ordering Information
4000A
5000A
6000A
3000A
2500A
1200A
1600A
2000A
601A
800A
Time-Current Curve
BIF#
AMPS
KRP-C
6.50
2.948
KRP-C-5000SP
KRP-C-6000SP
KRP-C-1600SP
*Weight per carton.
Note: Use KRP-CL for current ratings below 601 Amps.
Current-Limiting Effects
.1
20,000
10,000
1000
100
.01
*Prosp.
S.C.C.
CURRENT IN AMPERES
AVERAGE MELT
B
400,000
6,000
5,000
4,000
3,000
2,500
2,000
1,600
1,200
800
601
AMPERE
RATING
100,000
3000A
4000A
5,000
5,000
5,000
5,000
5,000
5,000
5,000
5,000
6000A
5,000
10,000
7,300
9,200
10,000
10,000
10,000
10,000
10,000
10,000
15,000
8,900
12,000
13,500
15,000
15,000
15,000
15,000
15,000
20,000
9,900
13,500
15,500
20,000
20,000
20,000
20,000
20,000
25,000
11,000
14,200
16,000
22,500
25,000
25,000
25,000
25,000
30,000
12,500
14,800
18,500
23,200
26,000
30,000
30,000
30,000
35,000
13,000
15,500
19,000
25,500
28,000
35,000
35,000
35,000
40,000
13,500
16,000
21,500
26,000
29,000
39,000
40,000
40,000
50,000
14,500
17,500
22,500
28,500
32,000
43,000
48,000
50,000
60,000
15,500
18,000
24,000
29,500
34,000
48,000
51,000
60,000
80,000
17,000
21,500
27,500
32,000
38,000
50,000
58,000
80,000
100,000
18,000
23,000
28,000
36,000
40,000
58,000
68,000
90,000
150,000
22,000
26,000
34,500
41,000
48,000
69,000
80,000
110,000
200,000
24,000
29,000
39,000
46,000
52,000
73,000
94,000
140,000
* RMS symmetrical amperes short-circuit current
Note: Data derived from current-limiting curves
Dimensional Data
10,000
1.63∑
.88∑
1.38∑
1.75∑
A
1.38∑
1.75∑
.81∑
.88∑
1800A
to
2000A
.38∑
5.75 ∑
1350A
to
1600A
6.75∑
801A
to
1200A
8.63∑
10.75∑
601A
to
800A
PROSPECTIVE SHORT CIRCUIT CURRENT
SYMMETRICAL RMS AMPERES
200,000
100,000
1,000
10,000
.63∑ All Slots and Holes
1,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
Current-Limitation Curve
Let-Through Current (Apparent RMS Symmetrical)
Versus Fuse Ratings
601A
800A
1200A
1600A
2000A
.38∑
.44∑
.5∑
2∑
2∑
2.5∑
2.5∑
2.38∑
2.75∑
3∑
3.5∑
2001A
to
2500A
3000A
.75∑
.75∑
3500A
to
4000A
.75∑
4500A
to
5000A
1∑
6000A
6.75∑
3.75∑
1∑
3.5∑
4∑
4.75∑
5.25∑
5.75∑
5∑
5∑
5.75∑
6.25∑
7.13∑
7
Bussmann
®
he LOW-PEAK® YELLOW™ DualElement fuse is the first fuse to not
only provide the long time-delay
for temporary motor start-up and
the transient surges associated with
such components as transformers,
but also the very fast speed-of-response
(current-limitation) for maximum shortcircuit protection. In this respect, the
LOW-PEAK YELLOW fuse combines the
time-delay characteristics of the Buss
FUSETRON dual-element fuse with
the very high current-limitation of the
LIMITRON fast-acting fuse. Now, one
type fuse serves all fuse protection
requirements through 600 amperes for
most building systems and general purpose equipment. It permits compliance
with NEC Sections 110.9–Interrupting
Rating, and 110.10–Component
Protection. This single fuse type insures
a degree of positive protection not
previously possible.
T
®
®
®
®
LPN-RK
& LPS-RK
/
1 10
– 600A
CATALOG SYMBOLS:
LPN-RK_SP
250V AC 1 /10 - 600A
125V DC 1 /10 - 60A
250V DC 70-600A
LPS-RK_SP
600V AC 1 /10 - 600A
300V DC 1 /10 - 600A
DUAL-ELEMENT TIME-DELAY:
10 SECONDS (MINIMUM) (8 SEC. FOR 30A 250V
CASE SIZE) AT 500% RATED CURRENT
1 /10 TO 600 AMPERES
CURRENT-LIMITING
250 AND 600 VOLTS AC (OR LESS)
INTERRUPTING RATING:
300,000 (AC)/100,000 (DC)
AGENCY INFORMATION:
UL LISTED–SPECIAL PURPOSE*
(Guide #JFHR, File #E56412)
CSA Class RK1 (200,000AIR) (Class #1422-02)
(File #53787, 0 to 60A)
DATA SHEET NUMBERS:
LPN-RK (0-600)SP
Data sheet #1003,1004
LPS-RK (0-600)SP
Data sheet #1001,1002
636.527.1450
APPROPRIATE FUSEHOLDERS:
LPN-RK (0-600)SP
Data sheet #1110
LPS-RK (0-600)SP
Data sheet #1111
8
Wire and Cable Protection
The currents let through by the fuses are
generally below the 1/2 cycle withstand
of most cable (cable is protected).
Conductor withstand ratings are given
in Buss bulletin SPD.
Lighting and Heating Loads
Fuses should be sized at 125% of the
continuous load (the same as the general
requirements for conductors and other
components).
Motor Starter Protection
Motor starters are very susceptible to
damage due to short-circuits. Even for
moderate or low-level faults, extensive
damage may occur if the short-circuit
protective device is not judiciously
selected. The most vulnerable parts are
the starter contacts and overload relay.
Fault currents can weld the contacts and
cause the overload relay sensing element
to be permanently altered.
Short-circuit testing in accordance
with UL Standard 508 determines
whether a motor starter can safely withstand specific levels of fault currents.
However, the standard does not define
the level of protection provided and, in
some cases, welding of contacts is considered acceptable. Traditionally, testing
per UL 508 has been appropriate for
NEMA devices which typically have
higher withstand ratings and allow
the user to replace damaged contacts
and relays.
To obtain the highest degree of
short-circuit protection for either NEMA
or IEC motor starters, use short-circuit
protective devices that are current-limiting and size them as close as practical.
A LOW-PEAK dual-element, currentlimiting fuse can be sized at 130% of
the motor full-load current rather than
300% sizing for non-time delay fuses.
A current-limiting fuse can cut off the
short-circuit current before it reaches
damaging levels.
When using the IEC style of motor
starter, the selection of the short-circuit
protective device becomes more critical.
The smaller IEC device has a much
lower withstand rating and in many
cases, contacts cannot be replaced. IEC
Publication 60947-4-1 addresses the
severity of damage to the motor starter.
Protection is categorized from considerable damage allowed (would require
replacement) to no damage.
Circuit Breaker Protection
Circuit breakers are mechanical overcurrent devices which generally have low
interrupting ratings and usually are not
current-limiting. Current-limiting LOWPEAK YELLOW fuses will protect circuit
breakers against short-circuit currents
that exceed their interrupting rating; i.e.,
when there is 50,000 amperes available
at a lighting panel with 10,000 ampere
interrupting rating circuit breakers.
A properly sized and tested feeder LOWPEAK fuse can protect the breakers. For
fuse selection, refer to tables published
by circuit breaker manufacturers or
fuse/circuit breaker series ratings can be
found at www.bussmann.com.
* Meets all performance requirements of UL STD. 248-12 for
Class RK1 fuses.
Overload Element
■ Time-delay permits 130% FLA sizing for backup, motor running protection. ■ Can protect
motors from burn-out due to single-phasing.
■ Design of heat absorber reduces watts loss.
/10 – 600A
1
BIF#
1003, 1004
AMPS
/10 – 600A
1
LPS-RK
BIF#
AMPS
LPN-RK
1001, 1002
TRUE
DUAL-ELEMENT
CONSTRUCTION
The overload or thermal cut-out element provides the very long time-delay which permits
the fuse to be sized near the full-load rating of
the motors which it protects (eliminates the
need for the fuse oversizing which could
reduce the degree of protection).
Short-Circuit Element
■ Current-limiting. ■ 300,000 Amps
Interrupting Rating. ■ Type 2 protection
for IEC and NEMA starters.
System Coordination
The short-circuit element provides the very
high-speed-of-response and current-limitation of this fuse. Even though it is highly
sensitive to and rapidly responds to fault
currents, it remains insensitive to starting
currents and transient surges. The use of
links of a highly specialized design configuration gives the Buss® LOW-PEAK® fuse its
unmatched characteristics.
Simple 2:1 Coordination with other Buss
LOW-PEAK fuses.
Meets all performance requirements of UL Standard 248-12 for Class RK1 fuses.
LOW-PEAK® YELLOW™
FUSETRON® FUSE
Long Time-Delay
on Overloads
LIMITRON® FUSE
Very High Degree of
Current-Limitation
LOW-PEAK® FUSE
All-Purpose, High
Performance Fuse
The LOW-PEAK YELLOW dual-element
fuse combines the long time-delay of the
FUSETRON dual-element fuse with the very
high degree of current-limitation of the
LIMITRON fast-acting fuse. It is thus a multipurpose, easy to select electrical protective
device. Its unique yellow color makes it easily
distinguishable from poorer performing fuses
(maximizes plant and personnel safety).
9
Bussmann
®
Time-Current Curves
Current-Limitation Curves
600A
100
10
10
1
1
AMPERE
RATING
300
100,000
600A
400A
200A
100A
60A
10,000
30A
A
200,000
100,000
1,000
300,000
1,000
.1
10,000
TIME IN SECONDS
B
400,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES
200A
400A
60A
100A
600
30A
15A
12
AMPERE
RATING
20A
4
6.25
10
5
8
2.5
.8
1
1.6
2
3.2
300
.2
.3
.4
.1
.15
.5
.6
1.25
LPN-RK
RMS SYMMETRICAL CURRENTS IN AMPERES
A-B=ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)
CURRENT IN AMPERES
1,000
100
1
.1
.01
10
.1
10,000
1000
100
20
10
.01
AVERAGE MELT
600A
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES
300
100
100
10
10
1
1
.1
100,000
600
400
200
100
60
10,000
30
15
A
RMS SYMMETRICAL CURRENTS IN AMPERES
A-B=ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)
1,000
CURRENT IN AMPERES
100
10
1
.1
.01
.1
10
1000
10,000
AVERAGE MELT
100
20
.01
300,000
100,000
1,000
1,000
10,000
TIME IN SECONDS
B
400,000
600
AMPERE
RATING
400A
200A
100A
60A
20A
12
AMPERE
RATING
30A
6.25
10
2
3.2
2.5
4
5
8
.5
.6
1.25
.8
1
1.6
.3
.4
300
.1
.15
.2
LPS-RK
Ordering Information
1003, 1004
/10 – 600A
1
BIF#
AMPS
/10 – 600A
1
LPS-RK
BIF#
AMPS
LPN-RK
1001, 1002
Current-Limiting Effects
Catalog Numbers LPN-RK
LPN-RK-⁄Ω¡ºSP
LPN-RK-3⁄Ω™SP
LPN-RK-60SP
LPN-RK-⁄fiΩ¡ººSP
LPN-RK-4SP
LPN-RK-70SP
LPN-RK-¤Ω¡ºSP
LPN-RK-4⁄Ω™SP
LPN-RK-80SP
LPN-RK-‹Ω¡ºSP
LPN-RK-5SP
LPN-RK-90SP
LPN-RK-›Ω¡ºSP
LPN-RK-5flꭧSP
LPN-RK-100SP
LPN-RK-⁄Ω™SP
LPN-RK-6SP
LPN-RK-110SP
LPN-RK-flꭧSP
LPN-RK-6⁄Ω¢SP
LPN-RK-125SP
LPN-RK-°Ω¡ºSP
LPN-RK-8SP
LPN-RK-150SP
LPN-RK-1SP
LPN-RK-9SP
LPN-RK-175SP
LPN-RK-1⁄Ω•SP
LPN-RK-10SP
LPN-RK-200SP
LPN-RK-1⁄Ω¢SP
LPN-RK-12SP
LPN-RK-225SP
LPN-RK-1›Ω¡ºSP
LPN-RK-15SP
LPN-RK-250SP
LPN-RK-1flꭧSP
LPN-RK-17⁄Ω™SP
LPN-RK-300SP
LPN-RK-1°Ω¡ºSP
LPN-RK-20SP
LPN-RK-350SP
LPN-RK-2SP
LPN-RK-25SP
LPN-RK-400SP
LPN-RK-2⁄Ω¢SP
LPN-RK-30SP
LPN-RK-450SP
LPN-RK-2⁄Ω™SP
LPN-RK-35SP
LPN-RK-500SP
LPN-RK-2°Ω¡ºSP
LPN-RK-40SP
LPN-RK-600SP
LPN-RK-3SP
LPN-RK-45SP
—
LPN-RK-3¤Ω¡ºSP
LPN-RK-50SP
—
*Prosp.
S.C.C.
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000
250,000
300,000
*Prosp.
S.C.C.
• 0-60 Amp fuses available with Albaloy plate option.
• 70-600 Amp fuses available with Tin plate option.
Catalog Numbers LPS-RK
LPS-RK-⁄Ω¡ºSP
LPS-RK-2⁄Ω™SP
LPS-RK-12SP
LPS-RK-110SP
LPS-RK-¤Ω¡ºSP
LPS-RK-2°Ω¡ºSP
LPS-RK-15SP
LPS-RK-125SP
LPS-RK-‹Ω¡ºSP
LPS-RK-3SP
LPS-RK-17⁄Ω™SP
LPS-RK-150SP
LPS-RK-›Ω¡ºSP
LPS-RK-3¤Ω¡ºSP
LPS-RK-20SP
LPS-RK-175SP
LPS-RK-⁄Ω™SP
LPS-RK-3⁄Ω™SP
LPS-RK-25SP
LPS-RK-200SP
LPS-RK-flꭧSP
LPS-RK-4SP
LPS-RK-30SP
LPS-RK-225SP
LPS-RK-°Ω¡ºSP
LPS-RK-4⁄Ω™SP
LPS-RK-35SP
LPS-RK-250SP
LPS-RK-1SP
LPS-RK-5SP
LPS-RK-40SP
LPS-RK-300SP
LPS-RK-1⁄Ω•SP
LPS-RK-5flꭧSP
LPS-RK-45SP
LPS-RK-350SP
LPS-RK-1⁄Ω¢SP
LPS-RK-6SP
LPS-RK-50SP
LPS-RK-400SP
LPS-RK-1›Ω¡ºSP
LPS-RK-6⁄Ω¢SP
LPS-RK-60SP
LPS-RK-450SP
LPS-RK-1⁄Ω™SP
LPS-RK-7SP
LPS-RK-70SP
LPS-RK-500SP
LPS-RK-1flꭧSP
LPS-RK-8SP
LPS-RK-80SP
LPS-RK-600SP
LPS-RK-1°Ω¡ºSP
LPS-RK-9SP
LPS-RK-90SP
—
LPS-RK-2⁄Ω¢SP
LPS-RK-10SP
LPS-RK-100SP
—
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000
250,000
300,000
Let-Through Current (Apparent RMS Symmetrical)
LPN-RK_SP (250V) Fuse Ratings
30A
60A
100A
200A
400A
900
1,600
2,100
3,150
5,000
1,100
1,950
2,600
3,950
6,900
1,200
2,150
2,950
4,500
7,650
1,350
2,400
3,200
4,900
8,350
1,400
2,550
3,350
5,300
8,850
1,500
2,700
3,550
5,600
9,300
1,600
2,850
3,750
5,850
9,700
1,650
2,950
3,900
6,150
10,050
1,750
3,150
4,150
6,600
10,700
1,850
3,300
4,400
7,000
11,250
2,000
3,650
4,750
7,650
12,200
2,150
3,900
5,050
8,250
12,950
2,450
4,350
5,700
9,400
14,500
2,650
4,800
6,200
10,300
15,700
3,250
5,000
6,600
11,050
16,700
3,600
5,600
7,000
11,750
17,550
600A
5,000
9,250
10,250
11,050
11,750
12,250
12,800
13,250
14,050
14,750
15,850
16,800
18,650
20,100
21,250
22,350
Let-Through Current (Apparent RMS Symmetrical)
LPS-RK_SP (600V) Fuse Ratings
30A
60A
100A
200A
400A
980
1,600
2,200
3,250
5,000
1,200
2,000
2,700
4,100
7,150
1,400
2,300
3,050
4,650
7,950
1,500
2,500
3,300
5,100
8,650
1,600
2,650
3,500
5,500
9,200
1,650
2,850
3,700
5,800
9,650
1,750
2,950
3,900
6,100
10,100
1,850
3,100
4,050
6,400
10,450
1,950
3,300
4,300
6,850
11,100
2,050
3,500
4,550
7,250
11,700
2,250
3,850
4,950
7,950
12,650
2,450
4,050
5,250
8,550
13,450
2,750
4,800
5,900
9,750
15,050
3,000
5,200
6,450
10,700
16,300
2,900
5,500
6,850
11,500
17,350
3,100
5,700
7,250
12,200
18,250
600A
5,000
9,600
10,650
11,500
12,200
12,750
13,300
13,750
14,600
15,300
16,450
17,450
19,400
20,900
22,100
23,200
* RMS symmetrical amperes short-circuit current.
Note: Data derived from current-limiting curves.
Dimensional Data
A
B
Carton Quantity and Weight
LPN-RK (250 Volts AC)
Ampere
Ratings
Carton
Qty.
Weight*
Lbs.
Weight*
Kg
Carton
Qty.
Lbs.
Kg
0.227
10
1.6
0.725
0-30
10
35-60
10
1.2
0.544
10
2.6
1.178
70-100
5
1.9
0.9
5
2.20
1.0
110-200
1
0.9
0.4
1
1.10
0.5
225-400
1
2.0
0.9
1
2.36
1.1
450-600
1
3.0
1.4
1
3.44
1.5
* Weight per carton.
0.5
250V
LPS-RK (600 Volts AC)
Ampere
⁄Ω¡º-30
35-60
A
2∑
3∑
B
.56∑
.81∑
600V
A
5∑
5.5∑
B
.81∑
1.06∑
A
B
250V
Ampere
70-100
110-200
225-400
450-600
A
5.88∑
7.13∑
8.63∑
10.38∑
B
1.16∑
1.66∑
2.38∑
2.88∑
600V
A
7.88∑
9.63∑
11.63∑
13.38∑
B
1.16”
1.66∑
2.38∑
2.88∑
11
Bussmann
®
he Buss LOW-PEAK YELLOW
dual-element fuse not only provides
the necessary time-delay for temporary motor startup currents and
transient surges associated with
such components as transformers,
but also the very fast speed of response
(current-limitation) for maximum shortcircuit protection. The new BussLOWPEAK fuse combines the time-delay
characteristics of the Buss FUSETRON®
dual-element fuse with the excellent current-limitation characteristics of the Buss
LIMITRON® fuse in a space-saving package one-half the size of Class R fuses.
Now, one fuse serves all fuse protection
requirements for most building systems,
general purpose equipment, and even
the newer IEC style components with
low fault current withstand capability.
The LOW-PEAK YELLOW fuse provides a degree of positive protection not
possible before in a UL listed time-delay
fuse. The unique dimensions assure that
another class of fuse with a lesser voltage
rating, interrupting rating or current-limiting ability cannot be substituted. The yellow color provides a positive check that
the proper fuse is being used. In terms of
functional characteristics, it provides the
highest degree of protection with the lowest let-through levels of I peak and I2t performance of any fuse in its class.
T
LPJ
1–600A
CATALOG SYMBOL:
LPJ-SP
DUAL-ELEMENT, TIME-DELAY:
10 SECONDS (MINIMUM)
AT 500% RATED CURRENT
CURRENT-LIMITING
1-600 AMPERES
600 VOLTS AC (OR LESS), 300V DC
INTERRUPTING RATING:
300,000A (AC)/100,000 (DC)
AGENCY INFORMATION:
UL LISTED–SPECIAL PURPOSE*
(Guide #JFHR, File #E56412)
CSA Class J (200,000 AIR)
(Class #1422-02, File #53787)
DATA SHEET NUMBERS:
LPJ (1-600)SP
Data sheet #1006,1007
636.527.1450
APPROPRIATE FUSEHOLDERS:
Finger-Safe
Data sheet #1152
Pyramid
Data sheet #1108
Fuseblock
Data sheet #1114
12
®
®
™
Protecting Low Interrupting
Capacity Circuit Breakers
The LOW-PEAK fuse can be used in service entrance equipment, feeder circuits,
and branch circuits, serving both motor
and non-motor loads, to limit the shortcircuit current to meet the withstand
requirements of circuit breakers. When
utility or building systems are expanded,
increased available short-circuit currents
may exceed the interrupting capacity of
the installed circuit breakers. In this event,
the all-purpose LOW-PEAK fuse can provide the additional protection required.
The LOW-PEAK fuses can be used
to limit the available short-circuit current to lighting panel circuit breakers,
switchboards, and panelboards.
Installing properly sized LOW-PEAK
fuses in series with system components
can give them protection against damage
which would result from high fault currents in excess of their capabilities. For
fuse selection, refer to tables published by
circuit breaker manufacturers or fuse/
circuit breaker series ratings can be
found at www.bussmann.com.
Motor Branch Circuit
Protection
To obtain the highest degree of motor
circuit protection, select the LOW-PEAK
dual-element current-limiting fuse.
Sizing the fuse at 150% of the motor
full-load current (FLA) provides superior
short-circuit protection plus a high
degree of back-up protection against
motor burnout from overload or singlephasing conditions. Under severe motor
starting conditions, the fuse may be
sized up to 225% of FLA (See N.E.C.
Section 430.52 for exceptions).
Motor starters and motor branch
circuit conductors are very susceptible
to damage due to short-circuits. Even for
moderate or low-level faults, extensive
damage may occur if the short-circuit
protective device is not judiciously
selected. The most vulnerable parts are
the starter contacts and overload relay.
Fault currents can easily weld the contacts and permanently alter or completely
destroy the overload relay sensing elements. When using IEC style motor
control the selection of the short-circuit
protective device becomes even more
critical. The smaller IEC devices have a
much lower withstand rating and in
many cases contacts cannot be replaced.
The figure on page 13 is an example of
IEC Publication 60947-4-1 Type “2” no
damage coordination with an IEC motor
starter. To obtain the highest degree of
short-circuit protection plus back-up
motor overload protection for either
NEMA or IEC motor starters, use BUSS
LOW-PEAK dual-element fuses.
* Meets all performance requirements of UL Std. 248-8 for Class J fuses.
BIF#
AMPS
LPJ
1– 600A
1006, 1007
Ordering Information
Time-Current Curve
600A
400A
200A
250A
125A
30A
60A
80A
100A
15A
Catalog Numbers
AMPERE
RATING
300
100
TIME IN SECONDS
10
1
LPJ-1SP
LPJ-4⁄Ω™SP
LPJ-25SP
LPJ-1⁄Ω¢SP
LPJ-5SP
LPJ-30SP
LPJ-125SP
LPJ-150SP
LPJ-1flꭧSP
LPJ-5flꭧSP
LPJ-35SP
LPJ-175SP
LPJ-1°Ω¡ºSP
LPJ-6SP
LPJ-40SP
LPJ-200SP
LPJ-2SP
LPJ-7SP
LPJ-45SP
LPJ-225SP
LPJ-2⁄Ω¢SP
LPJ-8SP
LPJ-50SP
LPJ-250SP
LPJ-2⁄Ω™SP
LPJ-9SP
LPJ-60SP
LPJ-300SP
LPJ-2°Ω¡ºSP
LPJ-10SP
LPJ-70SP
LPJ-350SP
LPJ-3SP
LPJ-12SP
LPJ-80SP
LPJ-400SP
LPJ-3¤Ω¡ºSP
LPJ-15SP
LPJ-90SP
LPJ-450SP
LPJ-3⁄Ω™SP
LPJ-17⁄Ω™SP
LPJ-100SP
LPJ-500SP
LPJ-4SP
LPJ-20SP
LPJ-110SP
LPJ-600SP
Available with silver-plated terminals. Add SP/ in front of part number.
Carton Quantity and Weight
.1
10,000
1,000
20
.01
100
Ampere
Ratings
Current-Limitation Curve
Kg.
Ampere
Ratings
Carton
Qty.
Lbs.
Kg.
0-30
10
1.09
0.49
110-200
5
4.21
1.91
35-60
10
1.78
0.81
225-400
1
1.67
0.76
70-100
5
1.69
0.77
450-600
1
2.80
1.27
Current-Limiting Effects
B
600A
400A
200A
100A
60A
50A
40A
30A
20A
15A
8A
10,000
3A
1A
AMPERE
RATING
1,000
PROSPECTIVE SHORT-CIRCUIT CURRENT
SYMMETRICAL RMS AMPS
200,000
100,000
1,000
10,000
A
100
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
*Prosp.
S.C.C.
100
Weight*
Lbs.
*Weight per carton.
CURRENT IN AMPERES
100,000
Weight*
Carton
Qty.
1,000
3,000
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000
Let-Through Current (Apparent RMS Symmetrical)
LPJ (600V) Fuse Ratings
15A
30A
60A
100A
200A
270
470
750
370
670
1,130
1,640
2,360
450
800
1,420
1,910
2,760
550
1,000
1,730
2,450
3,520
625
1,220
1,890
2,850
4,000
700
1,330
2,120
3,090
4,400
750
1,440
2,250
3,400
5,000
800
1,530
2,370
3,650
5,140
820
1,600
2,580
3,780
5,430
900
1,640
2,670
4,000
5,640
925
1,760
2,790
4,470
6,000
1,000
1,850
3,000
4,670
6,420
1,160
2,000
3,220
5,000
7,400
1,220
2,150
3,520
5,360
7,950
1,400
2,460
4,000
6,170
9,000
1,560
2,640
4,450
7,000
10,000
400A
600A
4,400
5,540
6,420
7,000
7,500
8,000
8,330
9,000
9,380
10,000
11,270
12,180
14,360
15,820
8,000
9,000
10,000
11,100
11,800
12,550
13,270
13,820
15,000
16,000
17,270
19,270
20,600
* RMS symmetrical amperes short-circuit current.
Note: Data derived from current-limiting curves.
Dimensional Data
Type “2” Coordination
with LOW-PEAK Fuses.
1,000
Dual-Element
Time-Delay Fuse
(125%) - Class J
TIME IN SECONDS
100
Crossover
Point
Ic=8xIe
10
1
CURRENT IN AMPERES
10,000
1,000
10
100
.1
.01
1-60 Amp Range
70-600 Amp Range
A
Legend:
Motor Start
Overload Relay
Motor Damage
#12 Wire Damage
Thermal Withstand Limit
Contactor Breaking Current
Contactor Withstand 30Ie2
Low-Peak, Dual-Element,
Time-Delay 171/2A
Ampere
1-30
35-60
Level of Protection
Type “2”
Yes
Single Phase
Yes
Back-up
Single Phase
Yes
Overload
Yes
Back-up Overload
Yes
Meets 110.10
Yes
Meets 430.52
Yes
Ampere
70-100
110-200
225-400
450-600
B
E
C
A
2.25∑
2.38∑
B
.81∑
1.06∑
A
4.63∑
5.75∑
7.13∑
8∑
A
D
C
C
.5∑
.63∑
B
1.13∑
1.63∑
2.11∑
2.5∑
F
H
C
2.63∑
3∑
3.38∑
3.75∑
D
3.63∑
4.38∑
5.25∑
6∑
B
G
E
.28∑
.28∑
.41∑
.53∑
F
.75∑
1.13∑
1.63∑
2∑
G
.13∑
.19∑
.25∑
.38∑
H
.42∑
.42∑
.58∑
.73∑
13
/2 – 30A
1
BIF#
LP-CC
®
AMPS
Bussmann
1023
20
25
30
3
3.5
4
4.5
6
8
10
12
15
.5
.6
.8
1
1.25
Time-Current Curve
200
• Faster response to damaging shortcircuit currents and higher interrupting rating than mechanical overcurrent protective devices.
100
10
/2 – 30A
CATALOG SYMBOL:
LP-CC
TIME-DELAY CURRENT-LIMITING:
300V DC 1/2-28/10A
150V DC 3-15
300V DC 20-30
AMP RATINGS 1/2-30 AMPS
AC VOLT RATING 600 VOLTS (OR LESS)
INTERRUPTING RATING:
200,000A RMS SYM.
AGENCY INFORMATION:
UL LISTED:
CLASS CC PER U.L. 248-4
(Guide #JDDZ, File #E4273)
CSA CERTIFIED - Class CC
(Class #1422-02, File #53787)
DC VOLT RATING 300 VOLT DC (OR LESS)
20,000 AIR, U.L. 248 -1 1/2 - 28/10A AND 20-30A
DIMENSIONS:
13/32” x 11/2” (10.3mm x 38.1mm),
WITH REJECTION FEATURE
DATA SHEET NUMBERS:
LP-CC (1/2-30)
Data sheet #1023
636.527.1450
APPROPRIATE FUSEHOLDERS:
Modular Fuseholder
Data sheet #1151
Fuseblock
Data sheet #1105
LP-CC LOW-PEAK® YELLOW™ Fuse
• A superior all-purpose, space saving
branch circuit fuse that meets most protection requirements up to 30 amps.
• Very compact; physical size is only
13/32” x 11/2” (10.3mm x 38.1mm),
with rejection tip.
• The unique yellow color makes it easy
to tell the correct fuse type is installed.
14
• Maximum interrupting rating for
available fault current in today’s large
capacity systems.
• Helps ensure that future growth will
not obsolete the system.
1
.1
Dual Characteristics
100
1
.4
Superior
Motor Circuit
Protection
• For protection of
small horsepower
motor circuits.
• Proper sizing can
provide Type “2”
coordinated protection for NEMA
and IEC motor
controllers.
10
.01
• Time-delay to avoid unwanted fuse
openings from surge currents.
CURRENT IN AMPERES
AVERAGE MELT
• Fast speed of response under shortDimensional Data
circuit conditions for a high degree of
current-limitation.
1.5∑
• BENEFIT: The LOW-PEAK fuse can
be sized close to full load ratings for
.41∑
maximum overload and short-circuit
protection.
• BENEFIT: Can
Ordering Information
be used where
Catalog Numbers
either a time-delay
LP-CC-⁄Ω™
LP-CC-2⁄Ω™
LP-CC-7⁄Ω™
or a fast-acting fuse
LP-CC-flꭧ
LP-CC-2°Ω¡º
LP-CC-8
is needed, making
LP-CC-°Ω¡º
LP-CC-3
LP-CC-9
selection easier
LP-CC-1
LP-CC-3¤Ω¡º
LP-CC-10
LP-CC-1⁄Ω•
LP-CC-3⁄Ω™
LP-CC-12
and reducing spare
LP-CC-1⁄Ω¢
LP-CC-4
LP-CC-15
fuse inventories
LP-CC-1›Ω¡º
LP-CC-4⁄Ω™
LP-CC-20
for substantial
LP-CC-1⁄Ω™
LP-CC-5
LP-CC-25
cost reduction.
LP-CC-1flꭧ
LP-CC-5flꭧ
LP-CC-1°Ω¡º
LP-CC-6
LP-CC-2
LP-CC-6⁄Ω¢
—
LP-CC-2⁄Ω¢
LP-CC-7
—
1,000
1
TIME IN SECONDS
200,000 Ampere Interrupting
Rating
LP-CC
AMPERE
RATING
LP-CC-30
—
Carton Quantity and Weight
Ampere
Ratings
0-30
Weight per Carton
Carton
Qty.
10
Lbs.
.193
Kg.
.088
Current-Limiting Effects
*Prosp.
S.C.C.
1,000
3,000
5,000
10,000
20,000
30,000
40,000
50,000
60,000
80,000
100,000
200,000
*Let-Through Current (Apparent RMS Symmetrical)
1⁄Ω¢ A
2°Ω¡ºA
15A
20A
25A
30A
100
140
165
210
260
290
315
340
350
390
420
525
135
210
255
340
435
525
610
650
735
785
830
1,100
240
350
420
540
680
800
870
915
1,050
1,130
1,210
1,600
305
440
570
700
870
1,030
1,150
1,215
1,300
1,500
1,600
2,000
380
575
690
870
1,090
1,300
1,390
1,520
1,650
1,780
2,000
2,520
435
580
710
1,000
1,305
1,520
1,700
1,820
1,980
2,180
2,400
3,050
*RMS Symmetrical Amperes Short-Circuit Current Note: Data derived from current-limiting curves
Note: To calculate Ip (Ipeak) multiply IRMS value ≈ 2.3.
Suggested Fuse Specifications
General
Fuses shall not be installed until equipment is
ready to be energized.This measure prevents
fuse damage during shipment of the equipment from the manufacturer to the job site,
or from water that may contact the fuse
before the equipment is installed. Final tests
and inspections shall be made prior to energizing the equipment. This shall include a
thorough cleaning, tightening, and review
of all electrical connections and inspection
of all grounding conductors. All fuses shall
be furnished and installed by the electrical
contractor. All fuses shall be of the same
manufacturer. Fuses shall be as follows:
A. Main, Feeder, and Branch Circuit Fuses
1. Circuits 601 through 6000 amperes
Circuits 601 through 6000 amperes shall
be protected by current- limiting BUSSMANN LOW-PEAK® YELLOW™ Timedelay fuses KRP-C(amp)SP. Fuses shall
employ “O” rings as positive seals
between the end bells and the glass
melamine fuse barrel. Fuse links shall
be pure silver (99.9% pure) in order
to limit the short-circuit current letthrough values to low levels and comply
with NEC® Sections requiring component protection. Fuses shall be timedelay and shall hold 500% of rated
current for a minimum of 4 seconds,
clear 20 times rated current in .01 seconds or less, with an interrupting rating
of 300,000 amperes RMS symmetrical,
and be listed by a nationally recognized
testing laboratory. Peak let-through currents and I2t let-through energies shall
not exceed the values established for
Class L fuses. Larger HP motors shall be
protected by these fuses, with ratings
as shown on the drawings.
2. Circuits 0 through 600 amperes
Circuits 0 through 600 amperes
shall be protected by current-limiting
BUSSMANN LOW-PEAK YELLOW
Dual-Element Time-Delay fuses
LPN-RK(amp)SP/LPS-RK(amp)SP or
LPJ(amp)SP. All fuses shall have separate
overload and short-circuit elements.
Fuses shall incorporate a spring activated
thermal overload element that has a
284 degrees Fahrenheit melting point
alloy. The fuses shall hold 500% of rated
current for a minimum of 10 seconds
(30A, 250V Class RK1 case size may be a
minimum of 8 seconds at 500% of rated
current) with an interrupting rating of
300,000 amperes RMS symmetrical, and
be listed by a nationally recognized
testing laboratory. Peak let-through currents and I2t let-through energies shall
not exceed the values established for
Class RK1 or J fuses.
Motor Circuits – All individual
motor circuits with full-load ampere
ratings (F.L.A.) of 461 (or 400)
amperes or less shall be protected by
BUSSMANN LOW-PEAK YELLOW
Dual-Element Time-Delay fuses LPNRK(amp)SP/LPS-RK(amp)SP or
LPJ(amp)SP. The following guidelines
apply for motors protected by properly sized overload relays: LPNRK(amp) SP/LPS-RK(amp)SP fuses shall
be installed in ratings of 130% [or
150% for LPJ(amp)SP fuses] of motor
full-load current (or next size larger
if this does not correspond to a fuse
size), except where high ambient
temperatures prevail, or where the
motor drives a heavy revolving part
which cannot be brought up to full
speed quickly, such as large fans.
Under such conditions the fuse may
be 175%* of the motor full-load current, or the next standard size larger
if 175%* does not correspond to a
standard fuse size. If this will not
allow the motor to start due to higher than normal inrush currents or
longer than normal acceleration
times (5 seconds or greater), fuses
may be sized up to 225% (or next
size smaller).
Motor Controllers – NEMA and IEC
Style motor controllers shall be protected from short-circuits by BUSSMANN LOW-PEAK YELLOW
Dual-Element Time-Delay fuses in
order to provide testing agency-witnessed Type 2 coordination for the
controller. This provides “no damage” protection for the controller,
under low and high level fault conditions, as required by IEC Publication
60947-4 and UL 508E.
3. Switchboards, Panelboards,
Load Centers
The manufacturer shall supply equipment utilizing fully rated and listed
components. This equipment shall be
tested, listed and labeled for the available short-circuit current. (Where seriesrated fuse/circuit breaker systems are
acceptable, the systems shall utilize tested, recognized components. The manufacturer shall supply switchboards,
panelboards and load centers which
have been tested, listed, and labeled
for the available short-circuit current,
and those combinations specified on
the drawings.)
4. Marking
Fuses shall be ”LOW-PEAK YELLOW” in
color. “LOW-PEAK YELLOW” NOTICE
labels to alert the end user of the engineered level of protection of the electrical equipment shall be field installed by
the electrical contractor. They shall be
marked with the proper fuse rating, per
the specifications, and placed in a conspicuous location on the enclosure.
These labels are available upon request
from Bussmann.
B. Supplementary – Light Fixture
Protective Fuses
1. Fluorescent fixtures shall be protected
by BUSSMANN GLR or GMF fuses in HLR
holders. These fixtures shall have individual protection on the line side of
the ballast. A fuse and holder shall be
mounted within, or as part of, the fixture. Size and type of fuse to be recommended by the fixture manufacturer.
2. All other ballast-controlled light fixtures
shall be protected by BUSSMANN KTK
or FNQ fuses in HEB, HPF, or HPS holders. These fixtures shall have individual
protection on the line side of the ballast. Fuse and holder shall be mounted
in a location convenient for changing
fuses. Holder shall be mounted in a protected location or be an in-line waterproof holder (HEB, HEX, or HEY). Size
and type of fuse to be recommended by
the fixture manufacturer or as indicated
on plans.
C. Spares
Upon completion of the building, the electrical contractor shall provide the owner with
spare fuses as shown below:
1. 10% (minimum of 3) of each type and
rating of installed fuses shall be supplied as spares.
2. BUSSMANN spare fuse cabinets –
Catalog No. SFC – shall be provided
to store the above spares. A supply of
“LOW-PEAK YELLOW” NOTICE Labels
shall be provided along with the spare
fuses in the spare fuse cabinet.
D. Substitution Approvals
The electrical contractor's proposal shall
be based upon the fuses specified, using
the manufacturer’s catalog numbers as called
for in the specification or on the drawings.
Coordination and current limitation requirements for protection of each part of the electrical system have been engineered on the basis
of the type, class and manufacturer specified. In
the event that the electrical contractor wishes
to furnish materials other than those specified,
a written request, along with a complete shortcircuit and selective coordination study, shall be
submitted to the engineer for evaluation at
least two weeks prior to bid date. If the engineer’s evaluation indicates acceptance, a written addendum will be issued listing the other
acceptable manufacturer.
*150% for wound rotor and all DC motors.
HEADQUARTERS
Cooper Industries
Bussmann Division
P. O. Box 14460
St. Louis, Missouri 63178-4460, USA
Telephone: 636 394 2877
Fax: 800 544 2570
International: 636 527 1413
Email: fusebox@buss.com
BUSSMANN BRASIL
Bussmann do Brasil Ltda.
Rodovia Santos Dumont, Km 23
Cruz das Almas
Itu - Sao Paulo- 13 300-000
Brasil
Telephone: 55 11 7824 1856
Fax: 55 11 7824 1721
COOPER BUSSMANN CHICAGO
7300 West Wilson Avenue
Chicago, IL 60656-4793
Telephone: 708 867 4600
Fax: 708 867 2211
Email: info@busscc.com
BUSSMANN DENMARK
5 Literbuen
DK-2740 Skovlunde
Copenhagen, Denmark
Telephone: 45 4485 0900
Fax: 45 4485 0901
Email: bussmann@bussmann.dk
EUROPEAN HEADQUARTERS
Cooper (UK) Ltd.
Bussmann Division
Burton-on-the-Wolds
Leicestershire LE12 5th, England
Telephone: 44 1509 882737
Fax: 44 1509 882786
Email: info@bussmann.co.uk
BUSSMANN INDIA
2nd floor, Unit #5
White House
23-29, St. Marks Road
Bangalore — 560 001
India
Telephone: 91 80 227 0893
Fax: 91 80 224 0124
BUSSMANN ASIA-PACIFIC
1 Jalan Kilang Timor
#06-01 Pacific Tech Centre
Singapore 159303
Republic of Singapore
Telephone: 65 278 6151
Fax: 65 278 3151
Email: bussmann@bussasiapac.com.sg
BUSSMANN MEXICO
Arrow-Hart, S.A. de C.V.
Poniente 148, No. 933
02300 Mexico, D.F. Mexico
Telephone: 52 5 587 0211
Fax: 52 5 567 4049
BUSSMANN AUSTRALIA
Block X
391 Park Road
PO Box 257
Regents Park, Sydney
NSW 2143, Australia
Telephone: 61 2 9743 8333
Fax: 61 2 9743 8070
COOPER ELECTRONIC TECHNOLOGIES, INC.
6000 Park of Commerce Blvd
Boca Raton, Fl 33487
Tel: 561 241 7876
Fax: 561 241 9339
ENBRAY CONTACTORS
Cooper (UK) Limited
Unit 5C, Clay Flatts
Industrial Estate
Workington, Cumbria
CA14 3YD
United Kingdom
Tel : +44 0 1900 870088
Fax : +44 0 1900 870099
Bussmann
COOPER BUSSMANN • P.O. BOX 14460 • ST. LOUIS, MO 63178-4460 • (636)394-2877
World Wide Web: www.bussmann.com
REORDER #3001
5-02-10M