Bussmann
®
Low-Peak
®
Dual-Element Time-Delay Fuses
Class RK1 – 250 Volts AC/DC
Dimensional Data
LPN-RK
70-600A
NEW
A
DES
B
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_SP
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-70SP
LPN-RK-80SP
LPN-RK-90SP
LPN-RK-100SP
LPN-RK-110SP
LPN-RK-125SP
LPN-RK-150SP
LPN-RK-175SP
LPN-RK-200SP
LPN-RK-225SP
LPN-RK-250SP
LPN-RK-300SP
LPN-RK-350SP
LPN-RK-400SP
LPN-RK-450SP
LPN-RK-500SP
LPN-RK-600SP
—
Features:
• Current limiting for maximum short-circuit protection.
• Type 2 protection for IEC and NEMA starters when properly
sized.
• 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
Available with tin plate option. Add Suffix “-TP” (Ex.: LPN-RK-100SP-TP)
Recommended fuseblocks for
Class R 250V fuses
See Data Sheet: 1110
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
Kg.
0.9
0.4
0.9
Equipment
Fuse Clips
200A
400A
Fuse Reducers For Class R Fuses
Desired
Fuse (Case)
Size
100A
100A
200A
100A
Catalog Number
(Pairs)
600V
No. 2621-R***
No. 2641-R
No. 642-R
No. 2661-R
No. 2662-R
No. 2664-R*
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.
600A
200A
400A
*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.
5-19-04
SB04174
Form No. LPN-RK 70-600
Page 1 of 2
Data Sheet: 1004
Bussmann
®
Low-Peak
®
Dual-Element Time-Delay Fuses
Class RK1 – 250 Volts AC/DC
Current Limitation Curves
400,000
LPN-RK
70-600A
NEW
B
DES
IGN
Time-Current Characteristic Curves–Average Melt
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES
100,000
AMPERE
RATING
600A
400A
200A
100A
100,000
200,000
1,000
RMS SYMMETRICAL CURRENTS IN AMPERES
A-B=ASYMMETRICAL AVAILABLE PEAK (2.3 x SYMM RMS AMPS)
10,000
A
1,000
300,000
10,000
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
For information on the previous design LPN-RK 70-6009SP,
see Data Sheet: 1048.
*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.
5-19-04
SB04174
Form No. LPN-RK 70-600
Page 2 of 2
Data Sheet: 1004
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