ECNR
Class RK5 250Vac, 1 to 60A
Dual-Element, Time-Delay Fuses
Dimensions (inches)
Catalog Symbol:
ECNR
Dual-Element, Time-Delay – 10 seconds (minimum) at 500%
rated current (8 seconds for fuses 30A or less)
Current-Limiting
Volts:
250Vac (or less)
125Vdc (or less)
Amps:
1 to 60A
IR:
200kA RMS Sym.
Agency Information:
CE, UL Listed, Std. 248-12,
Class RK-5, 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.
• Helps protect motors against burnout from single-
phasing on three-phase systems.
• 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 an overload
which is five times greater than the amp rating of the
fuse for a minimum of ten seconds.
Catalog Numbers (amps)
ECNR1
ECNR7
ECNR17.5
ECNR2
ECNR8
ECNR20
ECNR3
ECNR9
ECNR25
ECNR4
ECNR10
ECNR30
ECNR5
ECNR12
ECNR35
ECNR6
ECNR15
ECNR40
ECNR45
ECNR50
ECNR60
Carton Quantity and Weight
Carton
Weight per Carton
Amps
Quantity
lbs
kg
1–15
10
0.40
0.18
17.5–30
10
0.50
0.23
35–60
10
1.00
0.45
Class RK5 Fuse Blocks (250V) Catalog Data
(Clip Retaining Spring Standard, Suffix “R”)
Terminal Type (Suffix No.)
1
Basic
Screw
Box Lug
¼
4
"
Catalog
—
w/ Pres.
—
w/ Clip Quick
Number
Plate
CU only Connect
Amps
1
1 R25030-1 SR
PR
CR
COR
QR
to
2 R25030-2 SR
PR
CR
COR
—
30
3 R25030-3 SR
PR
CR
COR
—
31
1 R25060-1 —
—
CR
—
—
to
2 R25060-2 —
—
CR
—
—
60
3 R25060-3 —
—
CR
—
—
Poles
0509
BU-SB08624
Form No. ECNR 1-60
Page 1 of 2
Data Sheet #1315
ECNR
Class RK5 250Vac, 1 to 60A
Dual-Element, Time-Delay Fuses
Current Limitation Curves
Time-Current Characteristic Curves–
Average Melt
8 10 15
30
60
Time-Current Characteristic Curves–
Average Melt
Fuse Reducers For Class R Fuses
Equipment
Desired Fuse
Catalog Number
Fuse Clips
(Case) Size
(Pairs) 250V
60A
30A
No. 263-R
100A
30A
No. 213-R
60A
No. 216-R
200A
60A
No. 226-R
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-SB08624
Form No. ECNR 1-60
Page 2 of 2
Data Sheet #1315
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