Bussmann
®
Low-Peak
®
Dual-Element Time-Delay Fuses
Class RK1 – 250 Volts AC/DC
Dimensional Data
A
LPN-RK_SPI
70-600A
NEW
B
DES
IGN
Dimensions
(inches)
Ampere Ratings
70-100
110-200
225-400
450-600
5.88
7.13
8.63
10.38
“A”
(± 0.062)
(± 0.062)
(± 0.094)
(± 0.094)
1.10
1.61
2.36
2.88
“B”
(± 0.020)
(± 0.020)
(± 0.020)
(± 0.020)
Catalog Symbol:
LPN-RK_SPI
Ampere Rating:
70 to 600A
Voltage Ratings:
ac: 250V (or less)
dc: 250V (or less)
Interrupting Ratings:
ac: 300,000A RMS Sym.
dc: 100,000A
Agency Information:
UL Listed–Special Purpose**, Guide JFHR, File E56412
CSA Certified, (200,000 AIR) Class 1422-02, File 53787,
Class RK1 per CSA C22.2 No. 248.12
Catalog Numbers
LPN-RK-70SPI
LPN-RK-80SPI
LPN-RK-90SPI
LPN-RK-100SPI
LPN-RK-110SPI
LPN-RK-125SPI
LPN-RK-150SPI
LPN-RK-175SPI
LPN-RK-200SPI
LPN-RK-225SPI
LPN-RK-250SPI
LPN-RK-300SPI
LPN-RK-350SPI
LPN-RK-400SPI
LPN-RK-450SPI
LPN-RK-500SPI
LPN-RK-600SPI
—
Features:
• Current limiting for maximum short-circuit protection.
• Type 2 protection for IEC and NEMA starters when properly
sized.
• Permanent replacement fuse indication.
• High in-rush current motor protection.
• Time-delay that permits 130% FLA sizing for back-up motor
protection.
• Provides protection against single-phase motor damage.
• Low watt loss power consumption.
• Electrically isolated end caps.
• 250Vdc, UL Listed.
Applications:
• Branch distribution
• Motors
• Transformers
• Solenoids
• General purpose circuits
Recommended fuseblocks for
Class R 250V fuses
See Data Sheet: 1110
Available with tin plate option. Add Suffix “-TP” (Ex.: LPN-RK-100SP-TP)
Fuse Reducers For Class R Fuses
Equipment
Fuse Clips
Kg.
0.9
0.4
0.9
600A
400A
200A
Desired
Fuse (Case)
Size
100A
100A
200A
100A
200A
400A
Catalog Number
(Pairs)
600V
No. 2621-R***
No. 2641-R
No. 642-R
No. 2661-R
No. 2662-R
No. 2664-R*
Carton Quantity and Weight—LPN-RK (250Vac)
Ampere
Ratings
70–100
110–200
225–400
Carton
Qty.
5
1
1
Weight*
Lbs.
1.9
0.9
2.0
450–600
1
3.0
1.4
*Weight per carton.
** Meets all performance requirements of UL Standard 248-12 for Class RK1 fuses.
CE logo denotes compliance with European Union Low Voltage Directive
(50-1000Vac, 75-1500Vdc). Refer to Data Sheet: 8002 or contact
Bussmann Application Engineering at 636-527-1270 for more information.
*Single reducer only (pair not required).
***Reducer No. 2621-R does not apply to LPN-RK-70SP to LPN-RK-100SP
Fuses.
For additional information, see Data Sheet: 1118.
For non-indicating version, the LPN-RK_SP
is available. See Data Sheet: 1004
8-26-04
SB04295
Form No. LPN-RK 70-600
Page 1 of 2
Data Sheet: 1066
Bussmann
®
Low-Peak
®
Dual-Element Time-Delay Fuses
Class RK1 – 250 Volts AC/DC
Current Limitation Curves
LPN-RK_SPI
70-600A
400,000
B
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES
100,000
600A
400A
200A
100A
10,000
A
1,000
100,000
200,000
1,000
300,000
10,000
RMS SYMMETRICAL CURRENTS IN AMPERES
A-B=ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)
Current-Limiting Effects
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
Let-Through Current (Apparent RMS
Symmetrical) Versus Fuse Rating
100A
200A
400A
600A
2,100
3,150
5,000
5,000
2,600
3,950
6,900
9,250
2,950
4,500
7,650
10,250
3,200
4,900
8,350
11,050
3,350
5,300
8,850
11,750
3,550
5,600
9,300
12,250
3,750
5,850
9,700
12,800
3,900
6,150
10,050
13,250
4,150
6,600
10,700
14,050
4,400
7,000
11,250
14,750
4,750
7,650
12,200
15,850
5,050
8,250
12,950
16,800
5,700
9,400
14,500
18,650
6,200
10,300
15,700
20,100
6,600
11,050
16,700
21,250
7,000
11,750
17,550
22,350
*Values derived from curve data
The only controlled copy of this Data Sheet is the electronic read-only version located on the 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. 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 con-
tained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
AMPERE
RATING
8-26-04
SB04295
Form No. LPN-RK 70-600
Page 3 of 3
Data Sheet: 1066
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