{"product_id":"1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino","title":"1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino","description":"\n\u003ch2\u003e1-Channel Relay Module with Optocoupler Isolation – DC 3.3V \/ 5V \/ 12V \/ 24V\u003c\/h2\u003e\n\u003cp\u003eTake full control of high-power circuits with this versatile \u003cstrong\u003e1-Channel Electromagnetic Relay Module\u003c\/strong\u003e. Designed for makers, engineers, and hobbyists, it integrates seamlessly with Arduino, Raspberry Pi, and other microcontrollers. Dual optocoupler isolation keeps your sensitive control circuitry safe while switching loads up to \u003cstrong\u003eAC 250V\/10A or DC 30V\/10A\u003c\/strong\u003e. Wide input voltage compatibility (3.3V, 5V, 12V, 24V DC) means it works right out of the box with virtually any development platform.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Range:\u003c\/strong\u003e Compatible with DC 3.3V, 5V, 12V, and 24V power supplies — no extra regulator needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDouble Optocoupler Isolation:\u003c\/strong\u003e Strong drive capability, stable performance, and reliable signal separation; trigger current just 5mA.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh \u0026amp; Low Level Trigger:\u003c\/strong\u003e Jumper-selectable HIGH or LOW level trigger per channel for maximum flexibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFault-Tolerant Design:\u003c\/strong\u003e Relay remains inactive even if the control line is disconnected, preventing accidental switching.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Load Capacity:\u003c\/strong\u003e Normally open interface handles AC 250V\/10A and DC 30V\/10A — suitable for high-power applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED Status Indicators:\u003c\/strong\u003e Green power LED and red relay-status LED for instant visual feedback.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eScrew Terminal Connectors:\u003c\/strong\u003e All interfaces are accessible via easy-connect screw terminals — no soldering required for basic setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eModule Interface Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDC+:\u003c\/strong\u003e Connect to positive pole of power supply (match relay voltage: 5V, 12V, or 24V)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDC–:\u003c\/strong\u003e Connect to negative pole of power supply\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIN:\u003c\/strong\u003e Control signal input — accepts high or low logic level\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelay Output Terminals\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNO (Normally Open):\u003c\/strong\u003e Open circuit at rest; shorts to COM when relay is energised\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCOM (Common):\u003c\/strong\u003e Common relay terminal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNC (Normally Closed):\u003c\/strong\u003e Shorted to COM at rest; opens when relay is energised\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHigh \/ Low Level Trigger Selection\u003c\/h3\u003e\n\u003cp\u003eJumper \u003cstrong\u003eS1\u003c\/strong\u003e selects the trigger level for the relay channel. Short COM to LOW for low-level trigger; short COM to HIGH for high-level trigger. This makes the module compatible with both active-high and active-low microcontroller outputs.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 3.3V \/ 5V \/ 12V \/ 24V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTrigger Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Load (AC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250V \/ 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Load (DC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30V \/ 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectromagnetic Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIsolation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDual Optocoupler\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTrigger Level\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh or Low (jumper selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIndicators\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGreen (power), Red (relay status)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eScrew terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatible With\u003c\/h3\u003e\n\u003cp\u003eArduino Uno, Mega, Nano, ESP8266, ESP32, Raspberry Pi, and any microcontroller with a 3.3V–24V logic output.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-scr-solid-state-relay-switch-module-dc3-24v-40a-optocoupler\"\u003e1-Channel SCR Solid State Relay Module DC3–24V 40A Optocoupler\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-pack-12v-3-pin-pc-fan-power-extension-cable-26cm-cpu-gpu-cooler\"\u003e10-Pack 12V 3-Pin PC Fan Extension Cable 26cm – CPU GPU Cooler\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFurther Reading\u003c\/h3\u003e\n\u003cp\u003eFor electrical safety guidelines when working with relay-switched mains-voltage circuits, refer to \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety Standards\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What voltages can I use to power this 1-channel relay module?\u003c\/h4\u003e\n\u003cp\u003eA: The module supports DC 3.3V, 5V, 12V, and 24V input voltages, making it compatible with a wide range of microcontrollers and power supplies — including 3.3V boards like ESP32 and standard 5V Arduino boards.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this relay module with both high-level and low-level trigger microcontrollers?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The onboard jumper (S1) lets you select either high-level or low-level trigger mode, so the module works with virtually any microcontroller output regardless of its active logic state.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the maximum load this relay module can switch?\u003c\/h4\u003e\n\u003cp\u003eA: The normally open (NO) contacts are rated for AC 250V\/10A and DC 30V\/10A, making this module suitable for controlling lights, motors, pumps, and other high-power devices from a low-voltage microcontroller signal.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does the optocoupler isolation do?\u003c\/h4\u003e\n\u003cp\u003eA: The dual optocoupler isolation electrically separates the low-voltage control side (your Arduino or microcontroller) from the high-voltage load side. This protects your development board from voltage spikes and noise generated by the switched load.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What voltages can I use to power this 1-channel relay module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The module supports DC 3.3V, 5V, 12V, and 24V input voltages, making it compatible with a wide range of microcontrollers and power supplies — including 3.3V boards like ESP32 and standard 5V Arduino boards.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use this relay module with both high-level and low-level trigger microcontrollers?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The onboard jumper (S1) lets you select either high-level or low-level trigger mode, so the module works with virtually any microcontroller output regardless of its active logic state.\"}}, {\"@type\": \"Question\", \"name\": \"What is the maximum load this relay module can switch?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The normally open (NO) contacts are rated for AC 250V\/10A and DC 30V\/10A, making this module suitable for controlling lights, motors, pumps, and other high-power devices from a low-voltage microcontroller signal.\"}}, {\"@type\": \"Question\", \"name\": \"What does the optocoupler isolation do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The dual optocoupler isolation electrically separates the low-voltage control side (your Arduino or microcontroller) from the high-voltage load side. This protects your development board from voltage spikes and noise generated by the switched load.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/oasis-select.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\", \"item\": \"https:\/\/oasis-select.com\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"5V","offer_id":47727456682089,"sku":"5:200004182#5V","price":6.3,"currency_code":"USD","in_stock":true},{"title":"24V","offer_id":47727456714857,"sku":"5:200004183#24V","price":6.3,"currency_code":"USD","in_stock":true},{"title":"3.3V","offer_id":47727456747625,"sku":"5:200004763#3.3V","price":6.3,"currency_code":"USD","in_stock":true},{"title":"12V","offer_id":47727456780393,"sku":"5:144170022#12V","price":6.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/Se566236524774c3d942f6be20fad66ff6.webp?v=1782661608","url":"https:\/\/oasis-select.com\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino","provider":"Oasis Select","version":"1.0","type":"link"}