{"product_id":"4-channel-5v-relay-board","title":"4-Channel 5V Relay Board","description":"\u003cmeta name=\"description\" content=\"Buy 4Channel 5V Relay Board online in India at best price from The Tech Depot, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n```html\n\u003ch1\u003e4-Channel 5V Relay Board\u003c\/h1\u003e\n\u003cp\u003eControl up to four high-power devices independently using any 5V microcontroller with this optocoupler-isolated 4-channel relay module from The Tech Depot, Bengaluru. Fast shipping, 7-day warranty on manufacturing defects, and dedicated technical support.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Channels\u003c\/td\u003e\n\u003ctd\u003e4 (independently controlled)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC (active-low trigger)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoil Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Rating\u003c\/td\u003e\n\u003ctd\u003e10A @ 250V AC \/ 10A @ 30V DC per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Type\u003c\/td\u003e\n\u003ctd\u003eSPDT (NO, NC, COM) per relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrigger Current\u003c\/td\u003e\n\u003ctd\u003e~15-20 mA per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOptocoupler isolated (input-relay separation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Type\u003c\/td\u003e\n\u003ctd\u003eSRD-05VDC-SL-C (or equivalent sugar-cube relay)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndicator LEDs\u003c\/td\u003e\n\u003ctd\u003e4 x per-channel status LEDs + 1 x power LED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Header\u003c\/td\u003e\n\u003ctd\u003e6-pin (GND, IN1, IN2, IN3, IN4, VCC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoard Dimensions\u003c\/td\u003e\n\u003ctd\u003e~75 x 55 x 19 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e4 x M3 mounting holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e40 degreesC to +85 degreesC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eArduino, Raspberry Pi, ESP32, ESP8266, STM32, PIC, 8051, and other 5V-logic boards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal \/ Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7-day warranty on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003eEmail \u0026amp; WhatsApp 24\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 Independent Channels:\u003c\/strong\u003e Switch four separate AC or DC loads simultaneously from a single microcontroller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptocoupler Isolation:\u003c\/strong\u003e Protects your microcontroller from high-voltage transients and relay coil back-EMF.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Current Contacts:\u003c\/strong\u003e Each relay handles up to 10 A @ 250 V AC - suitable for lights, fans, pumps, solenoids, and more.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSPDT Outputs:\u003c\/strong\u003e Both Normally Open (NO) and Normally Closed (NC) terminals give you flexible wiring options per channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive-Low Trigger:\u003c\/strong\u003e Drive inputs LOW to energize relays; compatible with most microcontroller GPIO pins.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePer-Channel Status LEDs:\u003c\/strong\u003e Instantly see which relays are active without external test equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlyback Diodes Onboard:\u003c\/strong\u003e Built-in freewheeling diodes across each relay coil suppress voltage spikes during switching.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2.54 mm Header:\u003c\/strong\u003e Plug directly into breadboards or connect with standard Dupont jumper wires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Mountable:\u003c\/strong\u003e Four M3 corner holes for secure enclosure or panel mounting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose This?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e100% authentic from trusted component suppliers - no clones or remarked parts.\u003c\/li\u003e\n\u003cli\u003e1-5 day shipping, 7-8 day delivery from our Bengaluru warehouse; same-day delivery within Bengaluru.\u003c\/li\u003e\n\u003cli\u003eExpert technical support included - wiring guidance, code samples, and troubleshooting help.\u003c\/li\u003e\n\u003cli\u003eIdeal balance of channel count, board size, and cost for most home-automation and IoT projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProject Ideas\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHome Automation:\u003c\/strong\u003e Control lights, fans, water heaters, and appliances from your phone via ESP32 + Blynk or Home Assistant.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart Irrigation:\u003c\/strong\u003e Automate up to four solenoid valves based on soil-moisture sensor readings with Arduino.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Sequencing:\u003c\/strong\u003e Drive motors, pumps, or conveyor segments in timed sequences using PLC-style logic on STM32.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium \/ Terrarium Controller:\u003c\/strong\u003e Schedule heater, filter, air pump, and LED lighting cycles independently.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGarage \u0026amp; Security:\u003c\/strong\u003e Trigger door openers, sirens, electromagnetic locks, and indicator lights from a Raspberry Pi dashboard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning \u0026amp; Education:\u003c\/strong\u003e Teach relay logic, optocoupler operation, and safe AC switching in electronics labs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTypical Wiring Guide\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVCC -\u0026gt;\u003c\/strong\u003e 5 V supply (can share with Arduino 5 V pin for light loads; use a separate 5 V adapter for all 4 relays under load).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGND -\u0026gt;\u003c\/strong\u003e Common ground with microcontroller and 5 V supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIN1-IN4 -\u0026gt;\u003c\/strong\u003e Digital GPIO pins (set LOW to activate relay, HIGH to deactivate).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCOM \/ NO \/ NC -\u0026gt;\u003c\/strong\u003e Connect your AC\/DC load between COM and NO (for normally-off\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eProducts ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs technical support available?\u003c\/summary\u003e\n\u003cp\u003eYes, 24\/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return policy?\u003c\/summary\u003e\n\u003cp\u003e7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2\u003eBuy 4-Channel 5V Relay Board Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003e4-Channel 5V Relay Board\u003c\/strong\u003e online at \u003ca href=\"https:\/\/thetechdepot.in\"\u003eThe Tech Depot\u003c\/a\u003e - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on \u003cstrong\u003e4-Channel 5V Relay Board\u003c\/strong\u003e with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.\u003c\/p\u003e\n\u003cp\u003eLooking to buy \u003cstrong\u003e4-Channel 5V Relay Board\u003c\/strong\u003e at the best price in India? The Tech Depot offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.\u003c\/p\u003e","brand":"The Tech Depot","offers":[{"title":"Default Title","offer_id":48746556948737,"sku":"TTD-17762","price":147.34,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/1577\/3185\/files\/4a76e8cc13f91dee9069ed21b12d9ca0.png?v=1778107524","url":"https:\/\/techdepot.in\/products\/4-channel-5v-relay-board","provider":"Tech Depot India","version":"1.0","type":"link"}