2024年10月28日发(作者：嘉伟懋)
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, cULus Listed file No.
JDDZ.E4273,UL 248-12 – Class RK5 Fuses, CSA
C22.2 No. 248.12 – Class RK5 Fuses
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)
ECNR70ECNR110ECNR225
ECNR75ECNR125ECNR250
ECNR80ECNR150ECNR300
ECNR90ECNR175ECNR350
ECNR100ECNR200ECNR400
ECNR450
ECNR500
ECNR600
Carton Quantity and Weight
CartonWeight per Carton
AmpsQuantitylbs
kg
70–10051.50.68
101–20010.770.35
201–40011.520.69
401–60013.01.4
Class RK5 Fuse Blocks (250V) Catalog Data
(Clip Retaining Spring Standard, Suffix “R”)
AmpsPoles
701
to2
1003
110 to 2001
225 to 4001
450 to 6001
110 to 2003
225 to 4003
450 to 6003
Terminal Type (Suffix No.)
Basic Box Lug w/
Catalog—Reinforced Clip
NumberCU only
R25100-1CRCOR
R25100-2CRCOR
R25100-3CRCOR
R25200-1CR—
R25400-1CR—
R25600-1CR—
R25200-3CR—
R25400-3CR—
R25600-3CR—
Form No. ECNR 70-600
Page 1 of 2
Data Sheet #1316
0723
BU-SB09409
ECNR
Class RK5 250Vac, 70 to 600A
Dual-Element, Time-Delay Fuses
Current Limitation CurvesTime-Current Characteristic Curves–
Average Melt
Amp
Rating
100
200
400
600
P
e
a
k
L
e
t
-
T
h
r
o
u
g
h
C
u
r
r
e
n
t
A
m
p
s
Prospective Short-Circuit Current
Symmetrical RMS Amps
Fuse Reducers For Class R Fuses
EquipmentDesiredCatalog Number
Fuse Clips
Fuse Size(Pairs) 250V
200A70-100ANo. 2621-R
400A70-100ANo. 2641-R
110-200ANo. 642-R
70-100ANo. 2661-R
600A110-200ANo. 2662-R
225-400ANo. 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.
0723
BU-SB09409
Form No. ECNR 70-600
Page 2 of 2
Data Sheet #1316
2024年10月28日发(作者：嘉伟懋)
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, cULus Listed file No.
JDDZ.E4273,UL 248-12 – Class RK5 Fuses, CSA
C22.2 No. 248.12 – Class RK5 Fuses
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)
ECNR70ECNR110ECNR225
ECNR75ECNR125ECNR250
ECNR80ECNR150ECNR300
ECNR90ECNR175ECNR350
ECNR100ECNR200ECNR400
ECNR450
ECNR500
ECNR600
Carton Quantity and Weight
CartonWeight per Carton
AmpsQuantitylbs
kg
70–10051.50.68
101–20010.770.35
201–40011.520.69
401–60013.01.4
Class RK5 Fuse Blocks (250V) Catalog Data
(Clip Retaining Spring Standard, Suffix “R”)
AmpsPoles
701
to2
1003
110 to 2001
225 to 4001
450 to 6001
110 to 2003
225 to 4003
450 to 6003
Terminal Type (Suffix No.)
Basic Box Lug w/
Catalog—Reinforced Clip
NumberCU only
R25100-1CRCOR
R25100-2CRCOR
R25100-3CRCOR
R25200-1CR—
R25400-1CR—
R25600-1CR—
R25200-3CR—
R25400-3CR—
R25600-3CR—
Form No. ECNR 70-600
Page 1 of 2
Data Sheet #1316
0723
BU-SB09409
ECNR
Class RK5 250Vac, 70 to 600A
Dual-Element, Time-Delay Fuses
Current Limitation CurvesTime-Current Characteristic Curves–
Average Melt
Amp
Rating
100
200
400
600
P
e
a
k
L
e
t
-
T
h
r
o
u
g
h
C
u
r
r
e
n
t
A
m
p
s
Prospective Short-Circuit Current
Symmetrical RMS Amps
Fuse Reducers For Class R Fuses
EquipmentDesiredCatalog Number
Fuse Clips
Fuse Size(Pairs) 250V
200A70-100ANo. 2621-R
400A70-100ANo. 2641-R
110-200ANo. 642-R
70-100ANo. 2661-R
600A110-200ANo. 2662-R
225-400ANo. 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.
0723
BU-SB09409
Form No. ECNR 70-600
Page 2 of 2
Data Sheet #1316