{"product_id":"dc-3v-3-3v-optocoupler-relay-module-isolated-drive-control-board","title":"DC 3V\/3.3V Optocoupler Relay Module – Isolated Drive Control Board","description":"\n\u003ch2\u003eDC 3V\/3.3V Optocoupler Relay Module – Isolated Drive Control Board\u003c\/h2\u003e\n\u003cp\u003eTake full control of your electronics projects with the \u003cstrong\u003eALLOYSEED DC 3V\/3.3V Isolated Drive Control Board Relay Module\u003c\/strong\u003e. Designed for makers, hobbyists, and engineers, this compact optocoupler relay module delivers fast, reliable signal switching with built-in optical isolation — keeping your microcontroller safe while driving high-power loads. Compatible with Arduino, Raspberry Pi, ESP8266, and virtually any MCU platform, it's the dependable switching solution your automation projects demand.\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\u003eOutput Signal Indicator LED:\u003c\/strong\u003e Instantly confirm relay status at a glance — no guesswork required during testing or deployment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMCU-Compatible High-Level Trigger:\u003c\/strong\u003e Signal input connects directly to any microcontroller I\/O pin. Supports 3V and 3.3V logic levels for seamless integration.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Power Supply Design:\u003c\/strong\u003e Independent control and load power supplies deliver strong anti-interference performance and rock-solid optical isolation, protecting your MCU from voltage spikes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiode Reverse-Current Protection:\u003c\/strong\u003e Built-in flyback diode guards against reverse EMF, protecting both the relay coil and your circuit from damage.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Response \u0026amp; Long Service Life:\u003c\/strong\u003e Response time under 20ms and rated for up to 100,000 switching cycles — ideal for continuous automation and control applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Load Capacity:\u003c\/strong\u003e Capable of controlling loads up to 10A @ 250VAC or 10A @ 30VDC — suitable for lighting, motors, solenoids, and more.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eALLOYSEED\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eDC 3V \/ 3.3V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMain Components\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eEL817 Optocoupler, SRD-DC03V-SL-C Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMax Load (AC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e10A @ 250VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMax Load (DC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e10A @ 30VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eResponse Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u0026lt; 20ms\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eRelay Lifespan\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e100,000+ operations\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eTrigger Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eHigh-level trigger\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e70 × 20 × 17mm (2.76 × 0.79 × 0.67 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e20g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× DC 3V\/3.3V Isolated Drive Control Board Relay Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino, Raspberry Pi, ESP8266\/ESP32 automation projects\u003c\/li\u003e\n  \u003cli\u003eHome automation and smart device switching\u003c\/li\u003e\n  \u003cli\u003eIndustrial control and signal isolation circuits\u003c\/li\u003e\n  \u003cli\u003eMotor, lighting, and solenoid valve control\u003c\/li\u003e\n  \u003cli\u003eDIY electronics prototyping and robotics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLooking for more electronics accessories? Check out our \u003ca href=\"\/products\/22awg-glass-tube-fuse-holder-5x20mm-6x30mm-screw-type-10-pack\"\u003e10-Pack 22AWG Glass Tube Fuse Holder Set\u003c\/a\u003e and our \u003ca href=\"\/products\/100w-dual-port-car-charger-starlink-mini-fast-charging\"\u003e100W Dual-Port Fast Car Charger\u003c\/a\u003e for more reliable power and circuit protection solutions.\u003c\/p\u003e\n\n\u003cp\u003eFor technical standards and electrical safety guidance, refer to the U.S. Consumer Product Safety Commission – Electrical Safety resources.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is this optocoupler relay module compatible with Arduino and Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The DC 3V\/3.3V relay module is fully compatible with Arduino, Raspberry Pi, ESP8266, ESP32, and any other microcontroller that outputs a 3V or 3.3V high-level signal on its I\/O pins. Simply connect the signal pin from your MCU to the module's input and it will trigger reliably every time.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum load this relay module can switch?\u003c\/h4\u003e\n\u003cp\u003eA: This isolated relay module can handle loads up to \u003cstrong\u003e10A at 250VAC\u003c\/strong\u003e or \u003cstrong\u003e10A at 30VDC\u003c\/strong\u003e, making it suitable for controlling household lighting, small motors, solenoid valves, and other moderate-power devices safely from a low-voltage microcontroller signal.\u003c\/p\u003e\n\u003ch4\u003eQ: Why does this relay module use optical isolation (optocoupler)?\u003c\/h4\u003e\n\u003cp\u003eA: The EL817 optocoupler provides complete electrical isolation between the low-voltage microcontroller side and the high-voltage load side of the circuit. This protects your MCU from voltage spikes, noise, and back-EMF that can occur when switching inductive loads, greatly improving the reliability and longevity of your entire project.\u003c\/p\u003e\n\u003ch4\u003eQ: What does the dual power supply design mean?\u003c\/h4\u003e\n\u003cp\u003eA: The dual power supply design means the control circuit (MCU side) and the relay coil\/load circuit are powered separately. This minimizes electrical interference between the two sides, ensuring stable and accurate relay switching even in electrically noisy environments.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is this optocoupler relay module compatible with Arduino and Raspberry Pi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! The DC 3V\/3.3V relay module is fully compatible with Arduino, Raspberry Pi, ESP8266, ESP32, and any other microcontroller that outputs a 3V or 3.3V high-level signal on its I\/O pins. 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This minimizes electrical interference between the two sides, ensuring stable and accurate relay switching even in electrically noisy environments.\"}}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"United States","offer_id":47710904189033,"sku":"200007763:201336106","price":21.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S11b06fe17a6d414a9e17951e6e02db68A.webp?v=1782062747","url":"https:\/\/oasis-select.com\/products\/dc-3v-3-3v-optocoupler-relay-module-isolated-drive-control-board","provider":"Oasis Select","version":"1.0","type":"link"}