4-Channel Relay Module 5V/12V/24V — Optocoupler Isolation, High/Low Trigger, Arduino & Raspberry Pi

4-Channel Relay Module 5V/12V/24V Optocoupler Isolation, High/Low Trigger, Arduino & Raspberry Pi

$17.56 USD

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4-Channel Relay Module — 5V/12V/24V, Optocoupler Isolation, High/Low Trigger

This 4-channel relay module with optocoupler isolation allows an Arduino, ESP32, or Raspberry Pi to independently switch four AC or DC loads using digital output pins. Each channel is independently controlled and optocoupler-isolated, protecting the microcontroller from high-voltage transients. The most popular relay module size for home automation, multi-zone irrigation, and multi-channel switching projects.

Electrical Specifications

Channels: 4 independent relay channels
Coil Voltage: 5V / 12V / 24V (select version)
Maximum AC Load: 250V / 10A per channel
Maximum DC Load: 30V / 10A per channel
Trigger: High level or low level (selectable)
Isolation: Optocoupler per channel
Contacts: SPDT — NO and NC per channel
LED Indicators: Status LED per channel
Control Interface: 4 digital input pins (IN1–IN4)

Wiring

VCC: 5V (or 12V/24V) | GND: Ground
IN1–IN4: Connect to Arduino/ESP32 digital output pins
COM/NO/NC: Load connection terminals per channel

Arduino Example

// Control relay channel 1 (active LOW trigger)
const int relay1 = 2;
void setup() { pinMode(relay1, OUTPUT); digitalWrite(relay1, HIGH); } // OFF
void loop() {
  digitalWrite(relay1, LOW);  // ON
  delay(1000);
  digitalWrite(relay1, HIGH); // OFF
  delay(1000);
}