ZMCT102 | Micro Precision Current Transformer


About ZMCT102

ZMCT102 is a Micro precision current transformer having current ratio of 5A/2.5mA.ZMCT102 is the best choice to measure the AC current using a microcontroller. This CT is very easy to mount on PCB, It also provides high galvanic isolation and very high accuracy.

This current transformer module makes it easy to measure AC current upto 5 Amps. ZMCT102  is  a small size PCB mount CT with 2000:1 turns ratio and Dimensions:  18.2 x 12 x 19.2 mm(LxWxH).

Where to Buy?

The is available in many Chinese online stores. Its price varies, but you can get it for approximately $0.59 in most stores.

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Applications of ZMCT102 CT

  • Industrial apparatuses
  • Analog to digital circuits    
  • Metering (electrical energy meters)
  • AC Voltage measurements
  • Household electrical equipment
  • Sensing Overload Current
  • Ground fault detection
  • Electrical testing equipment and relay protection

Features of ZMCT102 Micro Precision Current Transformers

  • low price
  • High accuracy
  • small size ( 18.2mm x10mm) and lightweight
  • Easy PCB mounting
  • widely acclaimed
  • High galvanic isolation
  • Good consistency
Specifications Discriptions
Rated input current 0-5A(50Ω)
Rated output current 2.5mA at input 5A
phase angle error ≤15'(input 5A,sampling resistor 50Ω)
Isolation withstand voltage 4500V
Turns Ratio 2000:1
Measurement accuracy Class 0.2
Linearity ≤0.2%(5%dot~120%dot)
Installation PCB mounting(Pin Length>3mm)
Operating Frequency 45-55Hz
operating temperature -40℃~+70℃

ZMCT102 Datasheet

Download datasheet, it provide details specification, features, dimensions, mounting guidelines etc.

ZMCT103C Arduino Wiring Diagram

To connect a ZMCT102 sensor to an microcontroller board, the output signal from the CT sensor needs to be converted into the measurable range of microcontroller analog inputs signal range, which is +ve voltage between 0V and the ADC reference voltage (5V if no ADC Reff is supplied) .

To do this job the below circuit diagram is used,

The output of ZMCT102 is a current signal of 2.5ma, which needs to be converted to a voltage signal using a burden resistor. See the calculation of Burdon resistor of SCT-013 for reference.


ZMCT103C Arduino Code

“EmonLib.h” Electricity monitoring library designed by is best for voltage and current measurement.

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