Specifications

Leakage Current Transducers
These transducers detect the leakage current in AC cables using a ZCT, attenuate the
harmonic component contained in the current using a built-in low-pass filter, and output DC
current or DC voltage proportional to the fundamental leakage current value.
Applications
Measurement of the fundamental leakage current in inverters, thyristor control circuits, or
other AC circuits that contain a harmonic component.
T-51/T-101 Series
Transducers
145
T-51LGF 1.0
15mA
30mA
100mA
200mA
500mA
1A
5A
ZT15B
ZT30B
ZT40B
ZT60B
ZT80B
ZT100B
(Specify)

50 and 60Hz
1% P-P or less
1s or less
0.4kg
(
main unit only )
110VAC %
50 and 60Hz
Consumption
VA: 5
Outer shape
Box
Model name
Accuracy
(grade)
ZCT Input (AC)
Current Frequency
Output (DC)
Voltage or current and load
Ripple/Response speed
Auxiliary power
supply
Weight
Accessory
(ZCT)
Delivery period
classification
+
10
-15
1mA :
5mA :
4~20mA :
100mV :
1V :
5V :
10V :
1~5V :
0~5kΩ
0~1kΩ
0~600Ω
5kΩ~∞
5kΩ~∞
5kΩ~∞
10kΩ~∞
5kΩ~∞
Standard
product
Immediate delivery
 Quasi-standard
product
Within 20 days
Special
product
21 to 60 days
Symbol
Reference delivery period
Delivery period classification
Auxiliary
power supply
Input 15mA~5A
0.1~20mA
,
50mV~10V
100, 105, 110, 115, 120V
%
200, 210, 220, 230, 240V
24V±10%
T-51LGF
DC
Output
AC
*1 Lead wire specifications (between ZCT and transducer)
Make sure to use shielded wires.
Connect the shield (drain line) to the “±” input terminal.
*2 The ZCT is a dedicated accessory and thus cannot be used in
combinations other than those specified for the transducers.
*3 When the power supply frequency (fi) and the output frequency (fo) are
close to each other in the inverter circuit, beating may occur in the
leakage current and the output may fluctuate.
*4 Influence of external magnetic field
An error of approximately 0.4% may occur due to application of an
external magnetic field of 200A/m to the main unit and ZCT.
*5 Isolation between the input circuit and output circuit
The input and output terminals of the main unit are not insulated.
The measurement circuit (input side) and output circuit can be isolated
by using the accessory ZCT.
*6 The grade indicates the accuracy when only a fundamental wave is
input.
The influences of harmonic components are basically as follows.
Third harmonic content 30% ········································· approx. +2.0%
Fifth harmonic content 30% ·········································· approx. +0.5%
Eleventh harmonic content 30% ··································· approx. +0.1%
Two-core shielded wire of
0.5~2.0mm
2
(CVVS, etc.)
25m or less one way
Shielded wire specifications Allowable lead length
+10
-15
Manufacturable range  Harmonic attenuation waveform of low-pass filter
Low pass
filter
Leakage current waveform Waveform inside T-51LGF
Application example
Transformer
ZCT
Inverter
Motor
Leakage current transducer
T-51LGF
Data logger,
indicator,
recorder
T-51LGF ZCT