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The product is intended for specialists and requires qualified and authorized personnel. The product does not include assembly/use instructions . Putting the product into operation by unqualified persons leads to the loss of the warranty according to the Terms and Conditions on the site.
The specified technical parameters (current, power, etc.) represent maximum allowable values under ideal operating conditions. For safe use and optimal lifespan, it is recommended to operate the product continuously at no more than 50% of the specified maximum values.
AC current sensor module, 5A, ZMCT103C
Ideal for monitoring consumption in DIY and automation projects, this module measures alternating current up to 5A and provides an easy-to-read analog signal with Arduino or other development boards. It integrates quickly into measurement circuits, has compact dimensions for easy mounting, operates stably in industrial and electronic applications, being suitable for load detection and energy control.
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The AC current sensor module with ZMCT103C is a compact and efficient solution for measuring alternating current in light embedded and industrial applications. It is based on a precision current transformer with a toroidal core, which allows non-invasive measurement of alternating current without interrupting the tested circuit.
The module includes an integrated operational amplifier that conditions the output signal, making it directly compatible with the analog inputs of Arduino, ESP8266, ESP32, STM32 boards, and similar devices. The measurement range is 0 - 5A AC, with an analog output proportional to the measured current, calibrated for a 5V reference voltage.
It also features a digital output that switches when the current exceeds the set threshold. The trigger threshold of the digital output is adjusted via a potentiometer integrated on the board, allowing direct sensitivity adjustment without software.
The sampling resistor is included on the board, and the output is centered at approximately 2.5V when no current is present, allowing reading of both the positive and negative half-cycles.
Its small dimensions and mounting hole allow easy integration into panels and electronic enclosures. The module is suitable for energy consumption monitoring, overcurrent protection, industrial automation, and DIY projects involving the measurement of AC electrical loads.
Specifications:
Sensor type: ZMCT103C current transformer
Measurement range: 0 - 5A AC
Supply voltage: 5V DC
Output voltage: 0 - 5V analog (centered at ~2.5V without current)
Digital output: HIGH/LOW depending on set threshold
Threshold adjustment: potentiometer integrated on the board
Operating frequency: 50 - 60 Hz
Accuracy: ±1%
Sampling resistor: included on the board
Interface: analog output (pin AO)
Operating temperature: -40 to +85 degrees Celsius
Dimensions: approximately 31 x 13 mm
Pinout:
| Pin | Signal | Description |
|---|---|---|
| VCC | Power | 5V DC |
| GND | Ground | Common reference |
| AO | Analog | Analog signal proportional to current |
| DO | Digital | HIGH/LOW when exceeding set threshold |
Usage:
Connect VCC to the 5V pin of the development board.
Connect GND to the common ground of the circuit.
Connect AO to an analog input pin of the board (e.g., A0 on Arduino) if you want the exact current value.
Connect DO to a digital pin of the board if you only want detection of current threshold exceedance.
Pass the AC load's phase wire through the sensor's toroidal hole. Do not connect the sensor directly to the mains, but to the wire supplying the monitored load.
Adjust the potentiometer on the board to set the current threshold at which the digital output DO switches. Turn clockwise to increase the threshold and counterclockwise to decrease it.
In the acquisition code, read AO for the RMS current value or monitor DO for overcurrent alarm and protection.
For the RMS value on AO, collect samples over at least one full cycle (20ms at 50Hz) and apply the RMS formula.
Calibrate the sensor by comparing the measured value with a reference device and apply a correction factor if necessary.
Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.
Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.
Avertismente generale de siguranta:
Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.
Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.
Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.
Nu lasati produsul alimentat nesupravegheat in timpul testelor.
Produsul nu este jucarie si nu este destinat copiilor.
Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.
Identificare produs:
Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.
Producator / Importator / Distribuitor:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Website: www.sigmanortec.ro
Persoana responsabila in UE:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Documentatie si siguranta:
Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].
Reviews (3) - Review moderation
Functioneaza perfect.
Modul care sper sa functioneze conform asteptarilor mele.
OK
// ZMCT103C AC Current Sensor - Analog + Digital Output Test
// Reads RMS current via AO and monitors threshold trigger via DO
const int analogPin = A0;
const int digitalPin = 2;
const float vRef = 5.0;
const int adcResolution = 1023;
const float sensitivity = 2.5; // calibration factor (adjust as needed)
const int numSamples = 500;
void setup() {
Serial.begin(9600);
pinMode(digitalPin, INPUT);
Serial.println("ZMCT103C Current Sensor Test - AO + DO");
}
void loop() {
// Read RMS current from analog output
float sumSquares = 0.0;
for (int i = 0; i < numSamples; i++) {
int raw = analogRead(analogPin);
float voltage = (raw / (float)adcResolution) * vRef;
float centered = voltage - 2.5; // remove DC offset
sumSquares += centered * centered;
delayMicroseconds(100);
}
float rmsVoltage = sqrt(sumSquares / numSamples);
float rmsCurrent = rmsVoltage * sensitivity;
Serial.print("RMS Current: ");
Serial.print(rmsCurrent, 3);
Serial.println(" A");
// Read digital threshold output
int threshold = digitalRead(digitalPin);
if (threshold == HIGH) {
Serial.println("STATUS: Threshold exceeded - DO HIGH");
} else {
Serial.println("STATUS: Below threshold - DO LOW");
}
delay(500);
}
