{"product_id":"1-channel-relay-module-3-3v-24v-dual-optocoupler-isolation","title":"1-Channel Relay Module 3.3V–24V Dual Optocoupler Isolation","description":"\u003ch2\u003e1-Channel Relay Module – Dual Optocoupler Isolation, 3.3V \/ 5V \/ 12V \/ 24V Compatible\u003c\/h2\u003e\n\u003cp\u003eTake full control of your electronics projects with this versatile \u003cstrong\u003e1-Channel Relay Module Board\u003c\/strong\u003e. Compatible with 3.3V, 5V, 12V, and 24V systems, it works seamlessly with Arduino, Raspberry Pi, and a wide range of microcontrollers. Dual optocoupler isolation ensures robust signal separation, stable performance, and strong drive capability — making it an excellent choice for hobbyists, engineers, and makers alike. Made 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 3.3V, 5V, 12V, and 24V input — works with virtually any microcontroller or development board.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Load Capacity:\u003c\/strong\u003e Normally open (NO) interface supports up to AC 250V\/10A or DC 30V\/10A for switching high-power devices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Optocoupler Isolation:\u003c\/strong\u003e Provides strong electrical isolation between control and load circuits, ensuring stable, interference-free operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh \u0026amp; Low Level Trigger Selection:\u003c\/strong\u003e Each channel can be set to trigger on high or low logic level via onboard jumper (S1), giving you maximum flexibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFault-Tolerant Design:\u003c\/strong\u003e If the control signal line is disconnected, the relay remains in its current state — no accidental switching.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrigger Current:\u003c\/strong\u003e Only 5mA required — compatible with low-power microcontrollers without additional drivers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStatus Indicators:\u003c\/strong\u003e Green LED for power-on confirmation; Red LED for relay status monitoring at a glance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Wiring:\u003c\/strong\u003e All interfaces (DC+, DC−, IN, NO, COM, NC) are clearly labelled and accessible via screw terminals for quick, tool-friendly connections.\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 the positive terminal of the power supply.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDC−:\u003c\/strong\u003e Connect to the negative terminal of the power supply.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIN:\u003c\/strong\u003e Signal input — control the relay via 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 by default; shorts to COM when relay is energised.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCOM (Common):\u003c\/strong\u003e Common reference terminal for relay output.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNC (Normally Closed):\u003c\/strong\u003e Short circuit to COM by default; opens when relay is energised.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTrigger Level Selection\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eUse the \u003cstrong\u003eS1 jumper\u003c\/strong\u003e to select trigger mode for Relay 1.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCOM shorted to LOW:\u003c\/strong\u003e Low-level trigger mode.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCOM shorted to HIGH:\u003c\/strong\u003e High-level trigger mode.\u003c\/li\u003e\n\u003c\/ul\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\u003e3.3V \/ 5V \/ 12V \/ 24V DC\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 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\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\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eGreat for Use With\u003c\/h3\u003e\n\u003cp\u003eIf you enjoy DIY electronics, you may also like these tools and accessories from our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What voltage levels does this relay module support?\u003c\/h4\u003e\n\u003cp\u003eA: This relay module board supports 3.3V, 5V, 12V, and 24V DC input signals, making it compatible with Arduino, Raspberry Pi, ESP8266, ESP32, and most other common microcontrollers and development platforms.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I choose between high-level and low-level triggering?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The onboard S1 jumper lets you select between high-level and low-level trigger modes for the relay channel. Simply short the jumper to COM-HIGH for high-level triggering, or COM-LOW for low-level triggering — no soldering required.\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) output interface supports a maximum load of AC 250V\/10A or DC 30V\/10A, making it suitable for controlling lights, pumps, motors, solenoids, and other household or low-voltage industrial devices.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Why does this relay module use dual optocoupler isolation?\u003c\/h4\u003e\n\u003cp\u003eA: Dual optocoupler isolation electrically separates the low-voltage control circuit (your microcontroller) from the high-voltage load circuit. This protects your controller board from voltage spikes or back-EMF, ensuring more stable and reliable operation over time.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What voltage levels does this relay module support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This relay module board supports 3.3V, 5V, 12V, and 24V DC input signals, making it compatible with Arduino, Raspberry Pi, ESP8266, ESP32, and most other common microcontrollers and development platforms.\"}}, {\"@type\": \"Question\", \"name\": \"Can I choose between high-level and low-level triggering?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The onboard S1 jumper lets you select between high-level and low-level trigger modes for the relay channel. 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