Bussmann
®
LOW-PEAK
®
Dual-Element, Time-Delay Fuses
Class RK1 – 250 Volt
Dimensional Data
2"
(± 0.31)
0.56" (± 0.008)
LPN-RK
⁄Ω¡º-60A
3"
(± 0.31)
0.81" (± 0.008)
⁄Ω¡ºA
to 30A
35A to 60A
Catalog Symbol:
LPN-RK_SP
Dual-Element, Time-Delay – 10 seconds (minimum) at 500%
rated current (8 seconds for 0-30A sizes)
Current-Limiting
Ampere Rating:
⁄Ω¡º
to 60 Amperes
Voltage Rating:
250 Volts AC (or less)
Interrupting Rating:
AC: 300,000A RMS Sym.
DC: 50,000 Amperes
Agency Approvals:
UL Listed – Special Purpose*, Guide JFHR, File E56412
CSA Certified (200,000AIR), Class 1422-02, File 53787
Class RK1 per CSA C22.2, No. 248.12
*Meets all performance requirements of UL Standard 248-12 for Class RK1 fuses.
Features:
• Current-limitation for maximum short-circuit protection.
• Type 2 protection for IEC and NEMA starters when
properly sized.
• High inrush current motor protection.
• Time-delay permits 130% FLA sizing for back-up motor
protection.
• Protection against single-phase motor damage.
• Low watt loss power consumption.
• Electrically isolated end caps.
• 125 Vdc, U.L. Listed.
Fuse Reducers For Class R Fuses
Equipment
Fuse Clips
60A
100A
200A
Desired
Fuse (Case)
Size
30A
30A
60A
60A
Catalog Number
(Pairs)
250V
No. 263-R
No. 213-R
No. 216-R
No. 226-R
Fuseblocks
30 Amp Case
1 Pole
2 Pole
R25030-2CR
R25030-2SR
R25030-2PR
3 Pole
R25030-3CR
R25030-3SR
R25030-3PR
Catalog Numbers
LPN-RK-⁄Ω¡ºSP
LPN-RK-⁄fiΩ¡ººSP
LPN-RK-¤Ω¡ºSP
LPN-RK-‹Ω¡ºSP
LPN-RK-›Ω¡ºSP
LPN-RK-⁄Ω™SP
LPN-RK-flꭧSP
LPN-RK-°Ω¡ºSP
LPN-RK-1SP
LPN-RK-1⁄Ω•SP
LPN-RK-1⁄Ω¢SP
LPN-RK-1›Ω¡ºSP
LPN-RK-1flꭧSP
LPN-RK-1°Ω¡ºSP
LPN-RK-2SP
LPN-RK-2⁄Ω¢SP
LPN-RK-2⁄Ω™SP
LPN-RK-2°Ω¡ºSP
LPN-RK-3SP
LPN-RK-3¤Ω¡ºSP
LPN-RK-3⁄Ω™SP
LPN-RK-4SP
LPN-RK-4⁄Ω™SP
LPN-RK-5SP
LPN-RK-5flꭧSP
LPN-RK-6SP
LPN-RK-6⁄Ω¢SP
LPN-RK-8SP
LPN-RK-9SP
LPN-RK-10SP
LPN-RK-12SP
LPN-RK-15SP
LPN-RK-17⁄Ω™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
—
Box Lug
Screw
Pressure
Plate
Box Lug
Screw
Pressure
Plate
60 Amp Case
R25030-1CR
R25030-1SR
R25030-1PR
1 Pole
R25060-1CR
R25060-1SR
R25060-1PR
2 Pole
R25060-2CR
R25060-2SR
R25060-2PR
3 Pole
R25060-3CR
R25060-3SR
R25060-3PR
CE logo denotes compliance with European Union Low Voltage Directive
(50-1000 VAC, 75-1500 VDC). Refer to BIF document #8002 or contact
Bussmann Application Engineering at 636-527-1270 for more information.
Carton Quantity and Weight
Ampere
Ratings
0–30
35–60
**Weight per carton.
Carton
Qty.
10
10
Weight**
Lbs.
0.5
1.2
Kg.
0.227
0.544
12-1-99
A99074
Rev. A
Form No. LPN-RK 0-60
Page 1 of 2
BIF Doc #1003
Bussmann
®
LOW-PEAK
®
Dual-Element, Time-Delay Fuses
Class RK1 – 250 Volt
.5
.8
1.25
2
4
6.25
LPN-RK
⁄Ω¡º-60A
Time-Current Characteristic Curves–Average Melt
15A
20A
30A
60A
AMPERE
RATING
.1
.15
.2
.3
.4
.6
1
1.6
2.5
3.2
5
8
10
12
300
300
100
AMPERE
RATING
100
10
TIME IN SECONDS
1
10
TIME IN SECONDS
.1
1
RMS SYMMETRICAL CURRENT IN AMPERES
Current-Limitation Curves
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
400,000
B
1,000
.1
100
10
1
.01
.1
100,000
AMPERE
RATING
10,000
30
RMS SYMMETRICAL CURRENT IN AMPERES
A
100,000
200,000
1,000
10,000
1,000
RMS SYMMETRICAL CURRENTS IN AMPERES
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)
The only controlled copy of this BIF document is the electronic read-only version located on the
Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bul-
letin is intended to clearly present comprehensive product data and provide technical information that
will help the end user with design applications. Bussmann reserves the right, without notice, to
change design or construction of any products and to discontinue or limit distribution of any prod-
ucts. Bussmann 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.
12-1-99
A99074
Rev. A
Form No. LPN-RK 0-60
Page 2 of 2
BIF Doc #1003
10,000
1,000
100
20
60
.01
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