Bussmann®
LOW-PEAK®
LPN-RK
Dual-Element, Time-Delay Fuses
Class RK1 – 250 Volt
⁄Ω¡º-60A
Dimensional Data
2"
(± 0.31)
0.81" (± 0.008)
35A to 60A
⁄Ω¡ºA to 30A
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: 300,000A RMS Sym.
20,000AIR @ 125 VDC (UL)
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
3"
(± 0.31)
0.56" (± 0.008)
General Information:
• Current limitation for maximum short-circuit protection.
• High speed-of-response is highly sensitive to fault currents,
but insensitive to starting current and transient surges.
• Provides long time-delay for temporary motor start-up.
• Time-delay permits 125% FLA sizing for back-up, motor
running protection.
• Help protect motors from burn-out due to single-phasing.
• Design of heat absorber reduces watts loss.
• PTP fuse tube provides resistance to arcing, moisture and
flame.
• When properly sized, provides Type 2 protection for IEC
starters.
• 2:1 coordination ratio with other LOW-PEAK or Bussmann
Class L fuses.
Fuse Reducers For Class R Fuses
Desired
Fuse (Case)
Size
Equipment
Fuse Clips
60A
100A
*Meets all performance requirements of UL Standard 248-12 for Class RK1 fuses.
200A
Catalog Number
(Pairs)
250V
30A
No. 263-R
30A
No. 213-R
60A
No. 216-R
60A
No. 226-R
Catalog Numbers
LPN-RK-⁄Ω¡ºSP
LPN-RK-2SP
LPN-RK-9SP
LPN-RK-⁄fiΩ¡ººSP
LPN-RK-2⁄Ω¢SP
LPN-RK-10SP
LPN-RK-¤Ω¡ºSP
LPN-RK-2⁄Ω™SP
LPN-RK-12SP
LPN-RK-‹Ω¡ºSP
LPN-RK-2°Ω¡ºSP
LPN-RK-15SP
LPN-RK-›Ω¡ºSP
LPN-RK-3SP
LPN-RK-17⁄Ω™SP
LPN-RK-⁄Ω™SP
LPN-RK-3¤Ω¡ºSP
LPN-RK-20SP
LPN-RK-flꭧSP
LPN-RK-3⁄Ω™SP
Fuseblocks
30 Amp Case
1 Pole
2 Pole
3 Pole
Box Lug
R25030-1CR
R25030-2CR
R25030-3CR
Screw
R25030-1SR
R25030-2SR
R25030-3SR
R25030-1PR
R25030-2PR
R25030-3PR
LPN-RK-25SP
Pressure
Plate
60 Amp Case
LPN-RK-°Ω¡ºSP
LPN-RK-4SP
LPN-RK-30SP
LPN-RK-1SP
LPN-RK-4⁄Ω™SP
LPN-RK-35SP
1 Pole
2 Pole
3 Pole
LPN-RK-1⁄Ω•SP
LPN-RK-5SP
LPN-RK-40SP
Box Lug
R25060-1CR
R25060-2CR
R25060-3CR
LPN-RK-1⁄Ω¢SP
LPN-RK-5flꭧSP
LPN-RK-45SP
Screw
R25060-1SR
R25060-2SR
R25060-3SR
LPN-RK-1›Ω¡ºSP
LPN-RK-6SP
LPN-RK-50SP
R25060-1PR
R25060-2PR
R25060-3PR
LPN-RK-1flꭧSP
LPN-RK-6⁄Ω¢SP
LPN-RK-60SP
Pressure
Plate
LPN-RK-1°Ω¡ºSP
LPN-RK-8SP
—
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 314-527-1270 for more information.
Carton Quantity and Weight
Ampere
Ratings
Weight**
Carton
Qty.
Lbs.
Kg.
0–30
10
0.5
0.227
35–60
10
1.2
0.544
**Weight per carton.
Bussmann
rev. 9/10/97
Form No. LPN-RK 0-60
Page 1 of 2
BIF Doc #1003
Bussmann®
LOW-PEAK®
LPN-RK
AMPERE
RATING
60A
4
6.25
300
30A
AMPERE
RATING
15A
20A
300
⁄Ω¡º-60A
Time-Current Characteristic Curves–Average Melt
.1
.15
.2
.3
.4
.6
1
1.6
2.5
3.2
5
8
10
12
.5
.8
1.25
2
Dual-Element, Time-Delay Fuses
Class RK1 – 250 Volt
100
100
1
10
1,000
100
1
.1
.01
10
.1
RMS SYMMETRICAL CURRENT IN AMPERES
TIME IN SECONDS
TIME IN SECONDS
10
1
B
400,000
10,000
30
.01
1,000
60
10,000
20
100,000
100
AMPERE
RATING
.1
RMS SYMMETRICAL CURRENT IN AMPERES
200,000
100,000
1,000
10,000
A
1,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
Current-Limitation Curves
RMS SYMMETRICAL CURRENTS IN AMPERES
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)
Bussmann
rev. 9/10/97
This bulletin 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 products. 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.
Form No. LPN-RK 0-60
Page 2 of 2
BIF Doc #1003