ECNR
Class RK5 250Vac, 70 to 600A
Dual-Element, Time-Delay Fuses
Dimensions (inches)
5.88”
1.06”
70 to 100A
7.13”
1.56”
110 to 200A
8.63” ± 0.094
2.38” ± 0.020
225 to 400A
10.38” ± 0.094
2.88” ± 0.020
450 to 600A
Catalog Symbol:
ECNR
Dual-Element, Time-Delay – 10 seconds (minimum) at 500%
rated current
Current-Limiting
Volts:
250Vac(or less)
125Vdc (110-200A)
250Vdc (225-600A)
Amps:
70 to 600A
IR:
200kA RMS Sym.
Agency Information:
CE, UL Listed, Std. 248-12,
Class RK5, Guide JDDZ, File E162363 CSA Certified,
C22.2 No. 248.12, Class 1422-02, File 700489
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.
Catalog Numbers (amps)
ECNR70
ECNR110
ECNR225
ECNR75
ECNR125
ECNR250
ECNR80
ECNR150
ECNR300
ECNR90
ECNR175
ECNR350
ECNR100
ECNR200
ECNR400
ECNR450
ECNR500
ECNR600
Carton Quantity and Weight
Carton
Weight per Carton
Amps
Quantity
lbs
kg
70–100
5
1.5
0.68
101–200
1
0.77
0.35
201–400
1
1.52
0.69
401–600
1
3.0
1.4
Class RK5 Fuse Blocks (250V) Catalog Data
(Clip Retaining Spring Standard, Suffix “R”)
Amps
Poles
70
1
to
2
100
3
110 to 200 1
225 to 400 1
450 to 600 1
110 to 200 3
225 to 400 3
450 to 600 3
Terminal Type (Suffix No.)
Basic Box Lug w/
Catalog
— Reinforced Clip
Number
CU only
R25100-1
CR
COR
R25100-2
CR
COR
R25100-3
CR
COR
R25200-1
CR
—
R25400-1
CR
—
R25600-1
CR
—
R25200-3
CR
—
R25400-3
CR
—
R25600-3
CR
—
Form No. ECNR 70-600
Page 1 of 2
Data Sheet #1316
0509
BU-SB09409
ECNR
Class RK5 250Vac, 70 to 600A
Dual-Element, Time-Delay Fuses
Current Limitation Curves
Time-Current Characteristic Curves–
Average Melt
Amp
Rating
100
200
400 600
Peak Let-Through Current Amps
Prospective Short-Circuit Current
Symmetrical RMS Amps
Fuse Reducers For Class R Fuses
Equipment
Desired
Catalog Number
Fuse Clips
Fuse Size
(Pairs) 250V
200A
70-100A
No. 2621-R
400A
70-100A
No. 2641-R
110-200A
No. 642-R
70-100A
No. 2661-R
600A
110-200A
No. 2662-R
225-400A
No. 2664-R*
*Single reducer only (pair not required).
The only controlled copy of this document is the electronic read-only version maintained by Cooper Bussmann. 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.
0509
BU-SB09409
Form No. ECNR 70-600
Page 2 of 2
Data Sheet #1316
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