Low-Peak™ 250V Class RK1
LPN-RK — 250Vac/dc,
1
⁄
10
-60A, Dual Element, Time-Delay Fuses
Dimensions – in
2"
(± 0.31)
Available with easyID™
open fuse indication
3"
(± 0.31)
0.56" (±0.008)
0.81" (±0.008)
35 to 60A
1/10 to 30A
Description:
Ultimate protection Class RK1 dual element,
current-limiting, time-delay fuses available with optional open
fuse indication. Time-delay – 10 seconds (minimum) at 500%
of rated current (8 seconds for 0-30A sizes).
Catalog Symbol:
LPN-RK(amp)SP (non-indicating)
LPN-RK(amp)SPI (indicating)
Ratings:
Volts — 250Vac, 125Vdc
Amps —
1
⁄
10
-60A
IR — 300kA Vac RMS Sym.
— 100kA Vdc
Agency Information:
CE, UL Listed, Guide JDDZ, File E4273
CSA Certified, Class 1422-02, File 53787,
Class RK1 per CSA C22.2, No. 248.12
Catalog Numbers (amps) Non-indicating Fuses
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*
Features:
• Industry’s only UL Listed and CSA Certified fuse with a
300kA Vac interrupting rating that exceeds requirements for
virtually all applications
• Current-limitation for maximum short-circuit protection
• Easy selective coordination with all Low-Peak fuses using
simple 2:1 ampacity ratio
• “No damage” 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 for added safety
Recommended Fuse Blocks
Fuse Amps
0-30
35-60
1-Pole
H25030-1
R25030-1
H25060-1
R25060-1
2-Pole
H25030-2
R25030-2
H25060-2
R25060-2
3-Pole
H25030-3
R25030-3
H25060-3
R25060-3
For additional information on the 250 volt fuse blocks, see
Data Sheets # 1110 (R250), # 1112 (H250).
Fuse Reducers For Class R Fuses
Equipment
Fuse Clips
60A
100A
200A
Desired Fuse
(Case) Size
30A
30A
60A
60A
Catalog Numbers
(Pairs) 250V
NO.263-R
NO.213-R
NO.216-R
NO.226-R
For additional information on Class R fuse reducers, see
Data Sheet 1118.
* Open fuse indication available by inserting the suffix “I,” e.g. LPN-RK-50SPI.
Requires 75Vac minimum voltage.
Carton Quantity and Weight
Amp Rating
0–30
35–60
Carton Qty.
10
10
0713
BU-SB13686
Page 1 of 3
Data Sheet # 1003
Low-Peak™ 250V Class RK1
LPN-RK — 250Vac/dc,
1
⁄
10
-60A, Dual Element, Time-Delay Fuses
Time-Current Curves - Average Melt
15 to 60 Amps
15A
20A
30A
60A
B
Current-Limitation Curves
300
AMP RATING
400,000
300,000
200,000
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES
100
100,000
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
60A
10,000
9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
10
30A
TIME IN SECONDS
A
1
PROSPECTIVE SHORT-CIRCUIT CURRENT - SYMMETRICAL RMS AMPS
.1
RMS SYMMETRICAL CURRENT IN AMPS
The only controlled copy of this Data Sheet is the electronic read-only version located on the Cooper Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin is
intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice, to change
design or construction of any products and to discontinue or limit distribution of any products. Cooper 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.
0713
BU-SB13686
Page 3 of 3
Data Sheet # 1003
10,000
1,000
100
20
.01
Current-Limiting Effects
Prosp.
Let-Through Current
S.C.C.
(Apparent RMS Symmetrical Vs. Fuse Rating)
—
30A
60A
1000
1000
1000
2000
1000
1000
3000
1000
1000
5000
1000
2000
10,000
1000
2000
15,000
1000
2000
20,000
1000
3000
25,000
1000
3000
30,000
2000
3000
35,000
2000
3000
40,000
2000
3000
50,000
2000
3000
60,000
2000
3000
70,000
2000
3000
80,000
2000
4000
90,000
2000
4000
100,000
2000
4000
150,000
2000
4000
200,000
3000
5000
250,000
3000
5000
300,000
3000
6000
100,000
200,000
300,000
1,000
20,000
10,000
30,000
40,000
60,000
80,000
1,000
3,000
4,000
2,000
6,000
8,000
AMP RATING
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