The module detects the mains voltage connected to the input terminals and, thanks to the optocoupler used, guarantees galvanic isolation of the connected system so your microcontroller remains safe from high mains voltage. The output circuit's power supply voltage terminals allow operation in various standards, the module is ideal for use in PLC controllers. The onboard LED lights up when mains voltage is detected. The power supply can be 3-5V It can also be connected to the PLC24V level. Technical data: Input voltage: AC 220V ARK type I/O connectors output in TTL, PLC 24V standard LED indicating the presence of mains voltage at the input VCC / GND – supply voltage of the output circuit OUT / GND – signal output https://elecena.pl/product/25640976/1-channel-mains-voltage-detector-module-with-optoisolation 2024-03-26 https://elecena.pl/product/25640976/1-channel-mains-voltage-detector-module-with-optoisolation 2024-12-16 https://elecena.pl/product/25640976/1-channel-mains-voltage-detector-module-with-optoisolation 2025-10-25 https://elecena.pl/product/25640976/1-channel-mains-voltage-detector-module-with-optoisolation 2025-10-29