From Micro Ohm's description

20A Range Current Sensor Module ACS712 The 20A Range Current Sensor Module ACS712 consists of a precise, low-offset, linear Hall circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field in which the Hall IC converts into a proportional voltage. Sensing and controlling current flow is a fundamental requirement in a wide variety of applications including, over-current protection circuits, battery chargers, switching mode power supplies, digital watt meters, programmable current sources, etc. This ACS721 current module is based on the ACS712 sensor, which can accurately detect AC or DC current. The maximum AC or DC that can be detected can reach 20A, and the present current signal can be read via analog I / O port of Arduino. Note: The color of the product may vary. while shipping you may get any one of them. We are supplying two more of such modules which equip ACS712 IC for current measurement, they are as below 5A Range Current Sensor Module ACS712 30A Range Current Sensor Module ACS712 Note: ACS712 is based on the Hall detection principle, please try to avoid the magnetic field, when using it as it may impact the reading accuracy. Features : The low-noise analog signal path Device bandwidth is set via the new FILTER pin 5 µs output rise time in response to step input current Small footprint, low-profile SOIC8 package 2.1 kV RMS minimum isolation voltage from pins 1-4 to pins 5-8 5.0 V, single-supply operation 66 to 185 mV/A output sensitivity Output voltage proportional to AC or DC currents Factory-trimmed for accuracy Extremely stable output offset voltage Nearly zero magnetic hysteresis The ratiometric output from the supply voltage. Package Includes : 1 x 20A Range Current Sensor Module ACS712 Useful Links: The Useful Introduction_1 from Embedded-lab. The Useful Introduction_2 from Embedded-lab. Current sensor chip ACS712ELC-20A Operating Voltage (V) 4.5V ~ 5.5V DC Measure Current Range -20 ~ 20A Sensitivity 100mV/A Length (mm) 32 Width (mm) 13 Height (mm) 13.5 Weight (gm) 5 Shipment Weight 0.01 kg Shipment Dimensions 7 × 3 × 3 cm

From Most Electronic's description

Current Sensor Module ACS712 20A is a high-quality electronic component designed for Arduino, prototyping, and educational electronics. ACS712 20A Hall Current Sensor Module for Arduino/Raspberry-Pi/Robotics The 20 Amp Hall sensor provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switchmode power supplies, and overcurrent fault protection. Features of ACS712 20A Hall Current Sensor Module: Supply voltage: 5V Chip: ACS712ELC-20A Connector: analog Measuring range: 0 A to 20 A Sensitivity: 100mV/A Dimensions: 32x15mm Application of ACS712 20A Hall Current Sensor Module: Current Sensing. Fault detection point. DIY projects requiring constant current monitoring. Documents ACS712 Datasheet It’s perfect for DIY makers, students, and anyone building custom electronic circuits or STEM kits.

From Ampere Electronics's description

ACS712 Current Sensor Module – 20A The ACS712 is a fully integrated, hall effect-based linear current sensor with 2.1kVRMS voltage isolation and a integrated low-resistance current conductor. Technical terms aside, it?s simply put forth as a current sensor that uses its conductor to calculate and measure the amount of current applied. 80kHz bandwidth 66 to 185 mV/A output sensitivity Low-noise analog signal path Device bandwidth is set via the new FILTER pin 1.2 m? internal conductor resistance Total output error of 1.5% at TA = 25?C Stable output offset voltage. Near zero magnetic hysteresis applications: Motor speed control in motor control circuits Electrical load detection and management Switched-mode power supplies (SMPS) Protection for over-current 2D Model and Dimensions: Package Includes: 1x ACS712 module Product Datasheet: ACS712 Current Sensor Datasheet Related Products: Modules

From Makers Electronics's description

ACS712 20A Hall Current Sensor Module for Arduino/Raspberry-Pi/Robotics The 20 Amp Hall sensor provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switchmode power supplies, and overcurrent fault protection. Features of ACS712 20A Hall Current Sensor Module: Supply voltage: 5V Chip: ACS712ELC-20A Connector: analog Measuring range: 0 A to 20 A Sensitivity: 100mV/A Dimensions: 32x15mm Application of ACS712 20A Hall Current Sensor Module: Current Sensing. Fault detection point. DIY projects requiring constant current monitoring. Documents ACS712 Datasheet