{"product_id":"1-channel-relay-module-dc-3-3v-5v-12v-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 loads in your electronics projects with this versatile \u003cstrong\u003e1-Channel Electromagnetic Relay Module\u003c\/strong\u003e. Designed for Arduino, Raspberry Pi, and a wide range of microcontroller platforms, this board features dual optocoupler isolation for stable, noise-free switching performance. Whether you're automating home devices, building a DIY control system, or prototyping industrial circuits, this module delivers reliable results every time.\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 Compatibility:\u003c\/strong\u003e Supports DC 3.3V, 5V, 12V, and 24V power inputs — works seamlessly with virtually any microcontroller.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Power Load Capacity:\u003c\/strong\u003e Normally open (NO) interface handles up to AC 250V\/10A or DC 30V\/10A for switching real-world loads.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Optocoupler Isolation:\u003c\/strong\u003e Strong drive capability with stable performance; low trigger current of just 5mA protects your control circuitry.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh\/Low Level Trigger Selection:\u003c\/strong\u003e Jumper-selectable high or low level trigger on each channel — maximum flexibility for your circuit design.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFault-Tolerant Design:\u003c\/strong\u003e Even if the control line is disconnected, the relay remains in its safe state — no accidental switching.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStatus Indicators:\u003c\/strong\u003e Green power LED and red relay status LED provide at-a-glance monitoring of module operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUser-Friendly Terminals:\u003c\/strong\u003e All interfaces are accessible via screw terminals — no soldering required for quick wiring.\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 power supply terminal (match relay voltage — 5V, 12V, etc.)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDC–:\u003c\/strong\u003e Connect to negative (ground) power supply terminal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIN:\u003c\/strong\u003e Control signal input — accepts high or low logic level from your microcontroller\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 when relay is idle; closes to COM when activated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCOM (Common):\u003c\/strong\u003e Shared relay terminal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNC (Normally Closed):\u003c\/strong\u003e Short-circuited to COM when relay is idle; opens when activated\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTrigger Level Selection\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eS1 Jumper:\u003c\/strong\u003e Selects high or low level trigger for relay channel 1\u003c\/li\u003e\n  \u003cli\u003eShort COM to LOW → Low-level trigger active\u003c\/li\u003e\n  \u003cli\u003eShort COM to HIGH → High-level trigger active\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl 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\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\u003eChannels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax AC Load\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 DC Load\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30V \/ 10A\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\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 Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh or Low Level (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\u003ePower (Green), Relay Status (Red)\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\u003eRelated Products You May Like\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\/1-8m-displayport-to-hdmi-cable-4k-dp-adapter-pc-hdtv-projector\"\u003e1.8M DisplayPort to HDMI Cable 4K – DP Adapter for PC \u0026amp; TV\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLearn More About Electronics Safety\u003c\/h3\u003e\n\u003cp\u003eFor guidance on electrical safety when working with relay modules and high-voltage circuits, visit the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety resource page\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What voltages does this relay module support?\u003c\/h4\u003e\n\u003cp\u003eA: This 1-channel relay module supports a wide input voltage range of DC 3.3V, 5V, 12V, and 24V, making it compatible with Arduino, Raspberry Pi, ESP32, ESP8266, and most other microcontrollers and development boards.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this relay module with Arduino to switch AC mains devices?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The normally open (NO) output terminal is rated for up to AC 250V \/ 10A, so it can switch standard mains-voltage devices when properly wired. Always follow appropriate electrical safety precautions when working with AC voltages.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I select high or low level triggering?\u003c\/h4\u003e\n\u003cp\u003eA: Use the onboard S1 jumper to select the trigger level. Shorting COM to LOW configures the relay for low-level triggering (active LOW), while shorting COM to HIGH sets it for high-level triggering (active HIGH). This makes it easy to match your microcontroller's logic output.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does the dual optocoupler isolation do?\u003c\/h4\u003e\n\u003cp\u003eA: The dual optocoupler isolation electrically separates your microcontroller's control circuit from the relay's switching circuit. This protects your Arduino or other controller from voltage spikes and interference generated by the switched load, ensuring stable and safe operation.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What voltages does this relay module support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This 1-channel relay module supports a wide input voltage range of DC 3.3V, 5V, 12V, and 24V, making it compatible with Arduino, Raspberry Pi, ESP32, ESP8266, and most other microcontrollers and development boards.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use this relay module with Arduino to switch AC mains devices?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The normally open (NO) output terminal is rated for up to AC 250V \/ 10A, so it can switch standard mains-voltage devices when properly wired. Always follow appropriate electrical safety precautions when working with AC voltages.\"}}, {\"@type\": \"Question\", \"name\": \"How do I select high or low level triggering?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use the onboard S1 jumper to select the trigger level. Shorting COM to LOW configures the relay for low-level triggering (active LOW), while shorting COM to HIGH sets it for high-level triggering (active HIGH). This makes it easy to match your microcontroller's logic output.\"}}, {\"@type\": \"Question\", \"name\": \"What does the dual optocoupler isolation do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The dual optocoupler isolation electrically separates your microcontroller's control circuit from the relay's switching circuit. This protects your Arduino or other controller from voltage spikes and interference generated by the switched load, ensuring stable and safe operation.\"}}]}\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-5v-12v-24v-optocoupler-arduino\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"5V","offer_id":47727509831785,"sku":"5:200004182#5V","price":6.3,"currency_code":"USD","in_stock":true},{"title":"24V","offer_id":47727509864553,"sku":"5:200004183#24V","price":6.3,"currency_code":"USD","in_stock":true},{"title":"3.3V","offer_id":47727509897321,"sku":"5:200004763#3.3V","price":6.3,"currency_code":"USD","in_stock":true},{"title":"12V","offer_id":47727509930089,"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_aaa02940-b7b6-4460-82ae-5db467566f3f.webp?v=1782662190","url":"https:\/\/oasis-select.com\/products\/1-channel-relay-module-dc-3-3v-5v-12v-24v-optocoupler-arduino","provider":"Oasis Select","version":"1.0","type":"link"}