The main advantage of the KY-019 Relay Module is the built-in optocoupler, which completely separates the low voltage control circuit from the high voltage power circuit. By transmitting the activation signal through light, it ensures absolute electrical isolation and protects your microcontroller (Arduino, Raspberry Pi) from dangerous back-EMF and current spikes generated during the switching of the relay contacts. It is the most recommended and safe choice for any project managing 230V mains loads.

The module features a high-quality relay with a load switching capacity of up to 250V AC / 10A or 30V DC / 10A, allowing you to easily control household appliances, lamps, pumps, solenoid valves, and motors. It operates with a 5V DC power supply and requires minimal activation current at the signal input port (Signal IN), making it directly compatible with most development boards on the market. The standard NO (Normally Open), NC (Normally Closed), and COM (Common) contacts offer full flexibility in designing your electrical circuits.

Designed for maximum ergonomics, the KY-019 incorporates two indicator LED lights (Power & Status), which provide immediate visual confirmation of the module's power supply and the relay's activation status. It features a robust screw terminal connection for secure attachment of power cables, as well as 2.54mm pins for direct connection with Dupont-type cables. At the same time, the pre-drilled mounting holes allow for easy and stable installation in any automation box or construction.