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Bussmann(R)
Low-Peak(R)
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(R)
Low-Peak(R)
Dual-Element Time-Delay Fuses Class RK1 - 250 Volts AC/DC
Time-Current Characteristic Curves-Average Melt
LPN-RK_SPI
70-600A
NEW
DES
IGN
For information on the previous design LPN-RK 70-6009SP, see Data Sheet: 1048.
8-26-04
SB04295
Form No. LPN-RK 70-600 Page 2 of 3 Data Sheet: 1066
Bussmann(R)
Low-Peak(R)
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 contained 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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