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Q: how can we distinguish between acs712 for 20A and 30A. Is there any labeling on the sensor module to know whether it is 20A or 30A type?

Hi,The ACS712 device comes in three variants, providing current range of±5A (ACS712-05B), ±20A (ACS712-20B), and ±30A (ACS712-30A). The ACS712-05B can measure current up to ±5A and provides output sensitivity of 185mV/A (at +5V power supply), which means for every 1A increase in the current through the conduction terminals in positive direction, the output voltage also rises by 185 mV. The sensitivities of 20A and 30A versions are 100 mV/A and 66 mV/A, respectively.To read these numbers you would require a good magnifying glass though :).

Q: Is it possible to measure Earth Leakage Current with it ?

Yes .. We can measure the earth leakage current.. It's possible

Q: it is compatible with arduino uno ?

For very slow speed it is OK. but for high speeds we have to use other platform like Raspberry Pi.

Q: Can i directly connect it 230 v supply

Yes you can connect it to 230v supply but maximum current should not be as it's specifications like 30A,20A,5A

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Description

⚡ Stay ahead with precision current sensing—because your projects deserve the best!

COMPACT LIGHTWEIGHT - Slim 31x13mm PCB and just 20g—fits seamlessly into any project without bulk.
PRECISION 30 A DETECTION - Accurately measures current flow up to 30 amps, perfect for dynamic power monitoring.
INTEGRATED POWER INDICATOR - On-board LED lets you instantly verify power status, eliminating guesswork.
VERSATILE BIDIRECTIONAL SENSING - Detects both positive and negative currents, ideal for advanced energy management setups.
ANALOG OUTPUT FOR REAL TIME DATA - 185mV per amp output enables smooth integration with microcontrollers and data loggers.

The Generic ACS712 30A Hall Current Sensor Module offers precise ±30 amp current measurement with a compact 31x13mm PCB design. Powered by a stable 5V supply and featuring an on-board power indicator, it delivers a reliable 185mV/A analog output for seamless integration into professional and DIY electronics projects.

Specifications

Brand	Generic
Manufacturer	Bombay Electronics
Country of Origin	China
Model number	ACS712 30A
Number of Memory Sticks	1
Item Weight	400 g
Product Dimensions	7 x 5 x 5 cm; 400 g
Item model number	ACS712 30A
Item Height	50 Millimeters
Item Width	50 Millimeters
Voltage	5 Volts
Included Components	1 x ACS712 30A Hall Current Sensor Module
Are batteries included?	No