0713 BU-SB13731 Page 1 of 3 Data Sheet # 1020
FUSETRON™ 250V Class RK5
FRN-R — 250Vac/125Vdc, 70-600A, Dual Element, Time-Delay Fuses
Description: Advanced protection, energy efficient Class RK5
dual element, current-limiting, time-delay fuses. Time-delay –
10 seconds (minimum) at 500% of rated current.
Catalog Symbol: FRS-R-(amp)
Ratings:
Volts — 250Vac
— 125Vdc (110-200A)
— 250Vdc (225-600A)
Amps — 70-600A
IR — 200kA Vac RMS Sym.
— 20kA Vdc
Agency Information:
CE, UL Listed, Std. 248-12, Class RK5, Guide JDDZ,
File E4273
CSA Certified, C22.2 No. 248.12, Class 1422-02, File 53787
Catalog Numbers (amps)
FRN-R-70 FRN-R-125 FRN-R-350
FRN-R-75 FRN-R-150 FRN-R-400
FRN-R-80 FRN-R-175 FRN-R-450
FRN-R-85 FRN-R-200 FRN-R-500
FRN-R-90 FRN-R-225 FRN-R-600
FRN-R-100 FRN-R-250
FRN-R-110 FRN-R-300
Carton Quantity and Weight
Amp Rating Carton Qty.
70–100 5
101–200 1
201–400 1
401–600 1
Dimensions - in
Features:
• Provides motor overload, ground fault and short-circuit
protection
• Helps protect motors against burnout from overloads and
single-phasing when sized properly
• Simplifies and improves blackout prevention
(selective coordination)
• Dual-element fuses can be applied in circuits subject to
temporary motor overloads and surge currents to provide
both high performance short-circuit and overload
protection
• The overload element provides protection against low level
overcurrent of overloads and will hold on inrush current
which is five times greater than the amp rating of the fuse
for a minimum of ten seconds
Recommended Fuse Blocks
Fuse Amps 1-Pole 2-Pole 3-Pole
70-100 RM25100-1CR RM25100-2CR RM25100-3CR
110-200 RM25200-1CR RM25200-2CR RM25200-3CR
225-400 RM25400-1CR RM25400-2CR RM25400-3CR
450-600 RM25600-1CR RM25600-2CR RM25600-3CR
For additional information on the RM Series of 250 volt fuse
blocks, see product brochure # 3192.
Fuse Reducers For Class R Fuses
Equipment Desired Fuse Catalog Numbers
Fuse Clips (Case) Size (Pairs) 250V
200A 100A NO.2621-R
400A 100A NO.2641-R
200A NO.642-R
100A NO.2661-R
600A 200A NO.2662-R
400A NO.2664-R†
† Single reducer only (pair not required).
For additional information on Class R fuse reducers, see
Data Sheet # 1118.
5.88” 1.06”
7.13” 1.56”
8.63” ± 0.094
2.38” ± 0.020
10.38” ± 0.094
2.88” ± 0.020
70 to 100A
110 to 200A
225 to 400A
450 to 600A
0713 BU-SB13731 Page 2 of 3 Data Sheet # 1020
FUSETRON™ Class RK5
Time-Current Curves - Average Melt
AMP RATING
CURRENT IN AMPS
TIME IN SECONDS
60
100
200
400
600
FRN-R — 250Vac/125Vdc, 70-600A, Dual Element, Time-Delay Fuses
0713 BU-SB13731 Page 3 of 3 Data Sheet # 1020
FUSETRON™ Class RK5
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.
Current-Limitation Curves
400000
9000
8000
7000
7000
6000
6000
300000
200000
100000
5000
4000
4000
90000
3000
2000
1000
3000
70000
80000
70000
60000
B
A
50000
60000
200000
20000
2000
40000
100000
50000
10000
5000
1000
30000
90000
80000
40000
9000
8000
30000
20000
10000
600A
400A
200A
100A
AMP RATING
INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS
PROSPECTIVE SHORT-CIRCUIT CURRENT - SYMMETRICAL RMS AMPS
FRN-R — 250Vac/125Vdc, 70-600A, Dual Element, Time-Delay Fuses
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.
Current-Limiting Effects
Prosp. Let-Through Current
S.C.C. (Apparent RMS Symmetrical Vs. Fuse Rating)
100A 200A 400A 600A
5000 3000 5000 5000 5000
10,000 4000 7000 10,000 10,000
15,000 5000 8000 11,000 15,000
20,000 5000 8000 12,000 16,000
25,000 6000 9000 13,000 17,000
30,000 6000 10,000 14,000 18,000
35,000 6000 10,000 15,000 19,000
40,000 7000 11,000 15,000 20,000
50,000 7000 11,000 17,000 21,000
60,000 8000 12,000 18,000 22,000
70,000 8000 13,000 19,000 23,000
80,000 8000 13,000 19,000 24,000
90,000 9000 14,000 20,000 25,000
100,000 9000 14,000 21,000 26,000
150,000 10,000 16,000 24,000 29,000
200,000 11,000 18,000 26,000 32,000
