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Bussmann(R)
Low-Peak(R)
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(R)
Low-Peak(R)
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 contained 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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