0713 BU-SB13729 Page 1 of 3 Data Sheet # 1018
FUSETRON™ 600V Class RK5
FRS-R — 600Vac/300Vdc, 65-600A, 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 — 600Vac, 300Vdc
Amps — 65-600A
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)
FRS-R-65 FRS-R-125 FRS-R-350
FRS-R-70 FRS-R-150 FRS-R-400
FRS-R-75 FRS-R-175 FRS-R-450
FRS-R-80 FRS-R-200 FRS-R-500
FRS-R-90 FRS-R-225 FRS-R-600
FRS-R-100 FRS-R-250
FRS-R-110 FRS-R-300
Carton Quantity and Weight
Amp Rating Carton Qty.
65–100 1
101–200 1
201–400 1
401–600 1
Dimensions - in
Amp Ratings AB
65-100 7.88 (± 0.062) 1.11 (± 0.02)
110-200 9.63 (± 0.062) 1.61 (± 0.02)
225-400 11.63 (± 0.094) 2.34 (± 0.02)
450-600 13.38 (± 0.094) 2.88 (± 0.02)
Features:
• Provides motor overload, ground fault and short-circuit
protection. When used in circuits subject to surge currents
such as those caused by motors, transformers and other
inductive components, these fuses can be sized close to
full-load amps to give maximum overcurrent protection.
• The time-delay feature makes it possible to use fuse amp
ratings which are much smaller than those of non-time delay
fuses. Considerable cost saving occurs by permitting the
use of smaller size switches, panels and fuses themselves.
• Provides a good degree of short-circuit protection (greater
current-limitation) to help protect downstream components
from high fault currents.
• Gives motor running back-up protection to motors without
extra cost.
• Helps protect motors against burnout from overloads and
single-phasing when sized properly.
• Simplifies and improves blackout prevention (selective
coordination ratios).
• 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.
Recommended Fuse Blocks
Fuse Amps 1-Pole 2-Pole 3-Pole
70-100 RM60100-1CR RM60100-2CR RM60100-3CR
110-200 RM60200-1CR RM60200-2CR RM60200-3CR
225-400 RM60400-1CR RM60400-2CR RM60400-3CR
450-600 RM60600-1CR RM60600-2CR RM60100-3CR
For additional information on the RM Series of 600 volt fuse
blocks, see product brochure # 3192.
Fuse Reducers For Class R Fuses
Equipment Desired Fuse Catalog Numbers
Fuse Clips (Case) Size (Pairs) 600V
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.
A
B
0713 BU-SB13729 Page 2 of 3 Data Sheet # 1018
FUSETRON™ 600V Class RK5
Time-Current Curves - Average Melt
0.1
1
10
100
300
1,000
10,000
0.01
100
20,000
TIME IN SECONDS
RMS SYMMETRICAL CURRENT IN AMPS
AMP RATING
20 15A
30A
60A
100A
200A
400A
600A
FRS-R — 600Vac/300Vdc, 65-600A, Dual Element, Time-Delay Fuses
0713 BU-SB13729 Page 3 of 3 Data Sheet # 1018
FUSETRON™ 600V 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
FRS-R — 600Vac/300Vdc, 65-600A, 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 4000 5000 5000
10,000 4000 5000 9000 10,000
15,000 4000 6000 10,000 14,000
20,000 5000 7000 11,000 15,000
25,000 5000 7000 12,000 17,000
30,000 5000 8000 13,000 18,000
35,000 5000 8000 13,000 18,000
40,000 6000 9000 14,000 19,000
50,000 6000 9000 14,000 20,000
60,000 6000 10,000 15,000 22,000
70,000 7000 11,000 17,000 23,000
80,000 7000 12,000 17,000 23,000
90,000 7000 12,000 17,000 24,000
100,000 8000 13,000 18,000 25,000
150,000 9000 14,000 21,000 27,000
200,000 9000 16,000 23,000 32,000
