{"product_id":"4-channel-relay-module-5v-12v-24v-optocoupler-arduino-raspberry-pi","title":"4-Channel Relay Module 5V\/12V\/24V — Optocoupler Isolation, High\/Low Trigger, Arduino \u0026 Raspberry Pi","description":"\u003ch2\u003e4-Channel Relay Module — 5V\/12V\/24V, Optocoupler Isolation, High\/Low Trigger\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003e4-channel relay module\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChannels:\u003c\/strong\u003e 4 independent relay channels\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoil Voltage:\u003c\/strong\u003e 5V \/ 12V \/ 24V (select version)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum AC Load:\u003c\/strong\u003e 250V \/ 10A per channel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum DC Load:\u003c\/strong\u003e 30V \/ 10A per channel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrigger:\u003c\/strong\u003e High level or low level (selectable)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e Optocoupler per channel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContacts:\u003c\/strong\u003e SPDT — NO and NC per channel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED Indicators:\u003c\/strong\u003e Status LED per channel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eControl Interface:\u003c\/strong\u003e 4 digital input pins (IN1–IN4)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWiring\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVCC:\u003c\/strong\u003e 5V (or 12V\/24V) | \u003cstrong\u003eGND:\u003c\/strong\u003e Ground\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIN1–IN4:\u003c\/strong\u003e Connect to Arduino\/ESP32 digital output pins\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCOM\/NO\/NC:\u003c\/strong\u003e Load connection terminals per channel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eArduino Example\u003c\/h3\u003e\n\u003cpre\u003e\/\/ Control relay channel 1 (active LOW trigger)\nconst int relay1 = 2;\nvoid setup() { pinMode(relay1, OUTPUT); digitalWrite(relay1, HIGH); } \/\/ OFF\nvoid loop() {\n  digitalWrite(relay1, LOW);  \/\/ ON\n  delay(1000);\n  digitalWrite(relay1, HIGH); \/\/ OFF\n  delay(1000);\n}\u003c\/pre\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSmart home lighting control (4 zones)\u003c\/li\u003e\n  \u003cli\u003eMulti-zone irrigation system\u003c\/li\u003e\n  \u003cli\u003eHVAC zone control\u003c\/li\u003e\n  \u003cli\u003eIndustrial multi-channel switching\u003c\/li\u003e\n  \u003cli\u003eRaspberry Pi home automation server\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e4-channel optocoupler-isolated relay module — independent control of 4 AC\/DC loads for Arduino, ESP32, and Raspberry Pi home automation projects.\u003c\/p\u003e","brand":"Keszoox","offers":[{"title":"5V","offer_id":46981894373611,"sku":"14:350852#5V","price":17.56,"currency_code":"USD","in_stock":true},{"title":"12V","offer_id":46981894406379,"sku":"14:10#12V","price":17.64,"currency_code":"USD","in_stock":true},{"title":"24V","offer_id":46981894439147,"sku":"14:200004889#24V","price":17.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/4-channel-relay-module-5v-12v-24v-optocoupler-arduino-raspberry-pi.webp?v=1761112818","url":"https:\/\/keszoox.com\/products\/4-channel-relay-module-5v-12v-24v-optocoupler-arduino-raspberry-pi","provider":"Keszoox","version":"1.0","type":"link"}