ACS712 30A Current Sensor Module

The ACS712 30A Current Sensor Module provides an economical and precise solution for AC or DC current sensing in industrial, commercial, and DIY electronics projects. Utilizing fully integrated Hall-Effect IC technology, this module measures electrical current up to ±30A without placing heavy resistive loads on your system.

Key Features

• Dual AC/DC Sensing: Measures both positive and negative currents (±30A).

• High-Accuracy Hall-Effect Sensor: Built-in Allegro ACS712ELCTR-30A IC with low-noise signal path.

• Galvanic Isolation: Offers 2.1 kVRMS voltage isolation between high-power loads and sensitive control logic.

• Low Power Loss: Integrated 1.2 mΩ internal conductor resistance minimizes power dissipation.

• Easy Microcontroller Integration: Outputs an analog voltage signal proportional to the measured current (66 mV/A sensitivity).

How It Works

When current flows through the onboard terminal blocks, it generates a magnetic field detected by the internal Hall sensor. The IC converts this field into a linear analog voltage output:

• Zero Current Offset: Outputs $V_{CC} / 2$ (~2.5V at 5V input) when no current is passing.

• Sensitivity: Output swings by 66 mV per Ampere (higher voltage for positive current, lower for negative current).

Pinout & Interface

• VCC: 5V DC Power Supply

• GND: System Ground

• OUT: Analog signal pin (connect to MCU ADC pin like Arduino A0)

• Terminal Blocks (IP+ / IP-): In-series connections for the load wire

Technical Specifications