{"product_id":"1-channel-relay-module-5v-10a-spdt-active-low-arduino","title":"1-Channel Relay Module 5V — 10A SPDT, Active-Low, Opto-Isolated, Arduino Compatible","description":"\u003ch2\u003e1-Channel Relay Module — 5V, 10A SPDT, Active-Low Control, Arduino Compatible\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e1-channel 5V relay module\u003c\/strong\u003e is the most widely used relay module in Arduino and ESP32 projects worldwide — a complete, ready-to-use relay circuit on a single PCB. Connect 5V power, wire your load to the relay screw terminals, and control the relay with any Arduino digital output pin. The onboard transistor driver means the relay coil is driven by the module, not the MCU pin — only \u003cstrong\u003e~5mA from the GPIO pin\u003c\/strong\u003e is needed to switch a \u003cstrong\u003e10A load\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eThe relay is \u003cstrong\u003eactive-LOW\u003c\/strong\u003e: a logic LOW signal on IN1 energizes the relay (green LED ON, audible click). Logic HIGH or no connection de-energizes the relay. Both NO (Normally Open) and NC (Normally Closed) contacts are available on the screw terminal block.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e10A SPDT relay contacts\u003c\/strong\u003e — switches up to 250VAC @ 10A or 15VDC @ 10A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive-LOW control\u003c\/strong\u003e — logic LOW energizes relay; logic HIGH de-energizes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnboard transistor driver\u003c\/strong\u003e — only ~5mA from GPIO needed; safe for all MCU pins\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoth NO and NC contacts\u003c\/strong\u003e — switch load ON or OFF when relay energizes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreen LED indicator\u003c\/strong\u003e — illuminates when relay is energized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed power LED\u003c\/strong\u003e — confirms 5V supply connected\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in flyback diode\u003c\/strong\u003e — protects driver transistor from relay coil back-EMF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrew terminal block\u003c\/strong\u003e — secure load wiring without soldering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-pin header\u003c\/strong\u003e — GND \/ IN1 \/ VCC for direct Arduino connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~80mA when relay energized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Logic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eActive-LOW (LOW = relay ON)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGPIO Current Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~5mA (transistor driver onboard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Contact Rating (AC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125VAC @ 10A \/ 250VAC @ 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Contact Rating (DC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15V DC @ 10A (recommended max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSPDT (NO + NC + COM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLogic HIGH threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥4.2V (relay de-energizes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWiring Guide\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eControl header (3-pin):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGND\u003c\/strong\u003e → Arduino GND (must share ground with MCU)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIN1\u003c\/strong\u003e → Arduino digital output pin (LOW = relay ON)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVCC\u003c\/strong\u003e → 5V supply\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eLoad screw terminal (3-pin):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNO\u003c\/strong\u003e → Load terminal that connects to COM when relay energizes (IN1 LOW)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCOM\u003c\/strong\u003e → AC or DC power source for the load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNC\u003c\/strong\u003e → Load terminal that connects to COM when relay is de-energized (IN1 HIGH)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eActive-LOW Logic — Important\u003c\/h3\u003e\n\u003cp\u003eThis module uses \u003cstrong\u003eactive-LOW control\u003c\/strong\u003e: \u003ccode\u003edigitalWrite(relayPin, LOW)\u003c\/code\u003e turns the relay ON; \u003ccode\u003edigitalWrite(relayPin, HIGH)\u003c\/code\u003e turns it OFF. This is the opposite of what many beginners expect. The logic HIGH threshold is ~4.2V — a pull-up resistor may be needed if the control signal is from an open-collector output or if the GPIO voltage is below 4.2V at HIGH.\u003c\/p\u003e\n\n\u003ch3\u003eDC Voltage Limit\u003c\/h3\u003e\n\u003cp\u003eThe relay contacts are rated 30VDC on the relay body markings, but \u003cstrong\u003eDC arc suppression is poor above ~15V\u003c\/strong\u003e. Contacts can become sticky or weld at higher DC voltages. \u003cstrong\u003eLimit DC switching to 15V or below.\u003c\/strong\u003e For AC switching, the module handles up to 250VAC @ 10A reliably (tested at 1500W \/ 12.5A heater load).\u003c\/p\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eArduino home automation — control lights, fans, appliances from GPIO\u003c\/li\u003e\n\u003cli\u003eESP32 \/ ESP8266 IoT relay control via Wi-Fi or MQTT\u003c\/li\u003e\n\u003cli\u003eRaspberry Pi GPIO relay switching (with 3.3V–5V level shifter)\u003c\/li\u003e\n\u003cli\u003eAutomatic irrigation solenoid valve control\u003c\/li\u003e\n\u003cli\u003e12V DC motor and pump on\/off control\u003c\/li\u003e\n\u003cli\u003eSecurity system alarm and siren activation\u003c\/li\u003e\n\u003cli\u003eTemperature-controlled fan and heater switching\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × 1-Channel Relay Module 5V (10A SPDT, active-low, with screw terminals)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45681467752683,"sku":"","price":6.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/Relay-Module-1-x-5V.jpg?v=1723005895","url":"https:\/\/keszoox.com\/products\/1-channel-relay-module-5v-10a-spdt-active-low-arduino","provider":"Keszoox","version":"1.0","type":"link"}