High Ratio Wire Lead Transformers
CR Magnetics CR8400 Series of Wire Lead Current Transformers are available in a wide range
of sizes and materials to meet any AC current sensing needs. Our General Purpose designs
are made from the highest quality silicon steel cores available, and meet most of the common AC
current measurement needs. Our Revenue Grade (-N) are made from a nickel alloy core
which provides the most linear response over temperature and current level. A line of Ground
Fault (-G) are for measuring low AC currents including electrical shields.
Nanocrystalline (-A) is the most versatile providing accuracy, high saturation point and a
linear response in high frequency applications. The High Frequency (-F) products are
designed for high frequency applications such as high frequency power supplies and motor drives.
GENERAL PURPOSE CURRENT TRANSFORMERS
Ir
Vmax RMS
Te (typ.)
DCR Ω
Frequency
CR8401-1000
10
2.2
1009
49
20 Hz- 1 KHz
CR8410-1000
20
3.1
1012
41
20 Hz- 1 KHz
CR8420-1000
50
5.2
1018
22
20 Hz- 1 KHz
CR8420-2000
75
9.0
1983
90
20 Hz- 1 KHz
CR8448-1000
30
6.3
990
26
20 Hz- 1 KHz
CR8448-2000
50
13.7
2046
106
20 Hz- 1 KHz
CR8449-1000
50
11.6
1016
35
20 Hz- 1 KHz
CR8449-2000
75
23
2046
150
20 Hz- 1 KHz
CR8450-1000
100
16.5
1021
21
20 Hz- 1 KHz
CR8450-2000
200
32
2037
73
20 Hz- 1 KHz
REVENUE GRADE CURRENT TRANSFORMERS
Vmax RMS
Te (typ.)
DCR Ω
Frequency
40
6.6
2510
134
20 Hz- 1 KHz
50
10.0
2490
187
20 Hz- 1 KHz
CR8450-2500-N
75
12.0
2512
143
20 Hz- 1 KHz
CR8459-2000-N
200
11.5
2011
74
20 Hz- 1 KHz
Part Number
Ir
CR8448-2500-N
CR8449-2500-N
GROUND FAULT CURRENT TRANSFORMERS
Part Number
Ir
Vmax RMS
Te (typ.)
DCR Ω
Frequency
CR8401-1000-G
4
0.6
1005
49
20 Hz- 1 KHz
CR8410-1000-G
7
0.8
1007
38
20 Hz- 1 KHz
CR8420-1000-G
20
1.4
1011
44
20 Hz- 1 KHz
NANOCRYSTALLINE CURRENT TRANSFORMERS
Part Number
Ir
Vmax RMS
Te (typ.)
DCR Ω
Frequency
CR8401-1000-A
4
2.2
1034
43
50 Hz- 50 KHz
CR8410-1000-A
7
2.5
1015
39
50 Hz- 50 KHz
CR8420-1000-A
20
1.3
1023
43
50 Hz- 50 KHz
CR8420-2000-A
75
7.0
2010
89
50 Hz- 50 KHz
CR8448-1000-A
20
6.0
1000
25
50 Hz- 50 KHz
CR8448-2000-A
50
13.0
2000
103
50 Hz- 50 KHz
CR8448-2500-A
50
16.0
2524
131
50 Hz- 50 KHz
CR8449-1000-A
75
11.0
1002
35
50 Hz- 50 KHz
CR8449-2000-A
75
16.0
2013
144
50 Hz- 50 KHz
CR8449-2500-A
75
27.0
2501
182
50 Hz- 50 KHz
CR8450-1000-A
100
15.0
1003
21
50 Hz- 50 KHz
CR8450-2000-A
100
26.0
2000
72
50 Hz- 50 KHz
CR8450-2500-A
100
28.0
2501
134
50 Hz- 50 KHz
CR8459-2000-A
100
27.0
2001
73
50 Hz- 50 KHz
HIGH FREQUENCY CURRENT TRANSFORMERS
Part Number
Ir
Vmax RMS
Te (typ.)
DCR Ω
Frequency
CR8448-2000-F
50
3.9
2015
90
20 Hz - 200 KHz
CR8449-2000-F
75
7.4
2017
109
20 Hz- 200 KHz
CR8450-2000-F
100
8.5
2020
63
20 Hz- 200 KHz
Applications
Motor Load Measurement
Power Meters
High Frequency Current Sensing
Ground Fault Sensing
Features
High Ratio
Custom Lead Lengths Available
Specifications
Maximum Continuous Primary Current
4 X Ir
Insulation Voltage
3500 Vac/1min
Storage Temp.
-45°C thru +85 °C
Operating Temp. General Purpose & Nickel -40°C thru +85 °C
Operating Temp. High Frequency
-40°C thru +65 °C
Regulatory Agencies
I
DCR
VL = Vmax
-
R
I x DCR
Te
V=
For best linearity, choose R such that V < 0.8 VL
VL
Ir = Maximum AC Input Current to be linearly sensed Vmax = Maximum VAC (Saturation) CT will develop
Te = Effective turns ratio including losses (+/- 10%) (All Specifications tested at 60 Hz)
PACKAGE DIMENSIONS AND OUTLINE (mm/in)
A
B
C
D
E
min
max
max
max
Typ
CR8420
6.99
.275
9.0
.35
15.0
.59
17.53
.690
22
.87
30.0
1.18
22.35
.880
27.8
1.09
36.0
1.41
8.26
.325
8.20
.323
9.2
.36
75.08
2.275
73
2.87
100
3.94
CR8448
7.11
.280
23.42
.922
29.46
1.16
11.05
.435
100
3.94
CR8449
9.14
.354
13.08
.515
19
.75
26.0
1.02
36.83
1.45
48
1.89
31.8
1.25
43.18
1.70
60
2.36
17.0
.67
13.97
.55
17.5
.67
100
3.94
88.9
3.50
200
7.88
Part Number Prefix
CR8401
CR8410
CR8450
CR8459
The Professional
Energy Monitoring
Company
M N TI
ISO 9001:2008 Quality Management System
I
B
D
A
C
See Chart
E
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
Web: http://www.crmagnetics.com
95 --
E-mail: sales@crmagnetics.com
V
IxR
Te
Current Transformers
Part Number
CR8400 SERIES
F
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