A 5V Single-Channel Relay Module is an electronic switching board that allows low-power microcontrollers (like Arduino, ESP32, or Raspberry Pi) to safely control high-voltage, high-current AC or DC appliances. Actaways as an electrically operated switch, it isolates sensitive digital electronics from hazardous mains voltages using an internal electromagnetic coil. It is the most common module used across India for DIY home automation, smart agricultural pumps, and automated appliance switching.
✨ Key Features
- Dual-Source Galvanic Isolation: Most premium modules feature a built-in optocoupler (PC817) chip that isolates the control signal using light, ensuring high-voltage surges cannot travel back to destroy your microcontroller.
- Flexible Logic Switching: Equipped with an onboard jumper configuration or transistor logic circuit allowing the module to be triggered by either a High Logic Signal (5V) or a Low Logic Signal (0V).
- Onboard Status Indicators: Features dual surface-mount LEDs; one to show the module has Power (Red) and another to confirm when the relay coil is actively Triggered (Green).
- Heavy-Duty Screw Terminals: Built with thick plastic barrier screw terminals on the output side to securely clamp heavy high-voltage AC wires.
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