{"product_id":"8-channel-relay-module-5v-10a-spdt-active-low-opto-isolated-arduino","title":"8-Channel Relay Module 5V — 10A SPDT, Active-Low, Opto-Isolated, Arduino Compatible","description":"\u003ch2\u003e8-Channel Relay Module — 5V, 10A SPDT, Active-Low, Opto-Isolated\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e8-channel 5V relay module\u003c\/strong\u003e provides eight independently controlled SPDT relays on a single PCB — the standard solution for Arduino and ESP32 home automation projects requiring control of multiple AC or DC loads simultaneously. Each relay is driven by an onboard transistor and \u003cstrong\u003eopto-isolator\u003c\/strong\u003e, requiring only \u003cstrong\u003e\u0026lt;5mA from each GPIO pin\u003c\/strong\u003e to switch a \u003cstrong\u003e10A load\u003c\/strong\u003e. All eight relays can be energized simultaneously, drawing ~600mA total from the 5V supply.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eJD-VCC jumper\u003c\/strong\u003e allows the module to operate in two modes: standard mode (jumper installed, single 5V supply) or fully opto-isolated mode (jumper removed, separate 5V supply for relay coils) for maximum protection against AC-side faults.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8 independently controlled SPDT relays\u003c\/strong\u003e — IN1–IN8, each independently addressable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10A SPDT contacts\u003c\/strong\u003e — switches up to 250VAC @ 10A or 15VDC @ 10A per channel\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\u003eOpto-isolated inputs\u003c\/strong\u003e — complete electrical isolation between MCU and relay power\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJD-VCC jumper\u003c\/strong\u003e — selectable single-supply or dual-supply (full isolation) mode\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u0026lt;5mA GPIO drive\u003c\/strong\u003e — safe for all Arduino, ESP32, and Raspberry Pi GPIO pins\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed LED indicators\u003c\/strong\u003e — one per channel, illuminates when relay energized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in flyback diodes\u003c\/strong\u003e — protects driver transistors from relay coil back-EMF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 × M3 mounting holes\u003c\/strong\u003e — for secure enclosure mounting\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~70mA per relay energized (~600mA all 8 on)\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\u003eLogic HIGH threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;2.8V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLogic LOW threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1.2V\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\u0026lt;5mA (opto-isolated 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\u003e115VAC @ 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) per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCB Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e138 × 56 × 20mm (5.4 × 2.2 × 0.79″)\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 (1×10):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGND\u003c\/strong\u003e → Arduino\/MCU GND (must share ground)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIN1–IN8\u003c\/strong\u003e → Arduino digital output pins (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\u003eIsolation header (1×3):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eJD-VCC\u003c\/strong\u003e → Relay coil power. \u003cem\u003eJumper to VCC\u003c\/em\u003e for single-supply mode (default). \u003cem\u003eRemove jumper, connect separate 5V\u003c\/em\u003e for full opto-isolation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVCC\u003c\/strong\u003e → Logic supply (same as control header VCC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGND\u003c\/strong\u003e → Ground for separate relay supply (if used)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eLoad screw terminals (per channel):\u003c\/strong\u003e NO \/ COM \/ NC — same as 1-channel module.\u003c\/p\u003e\n\n\u003ch3\u003eOpto-Isolation Modes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard mode (jumper installed):\u003c\/strong\u003e JD-VCC tied to VCC — single 5V supply powers both logic and relay coils. Opto-isolators still present but not providing full isolation. Easiest setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull isolation mode (jumper removed):\u003c\/strong\u003e Separate 5V supply connected to JD-VCC powers relay coils independently. MCU logic circuit is fully isolated from relay power — maximum protection against AC-side faults, lightning strikes, or load failures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDC Voltage Limit\u003c\/h3\u003e\n\u003cp\u003eRelay contacts are rated 30VDC on the relay body, but \u003cstrong\u003eDC arc suppression is poor above ~15V\u003c\/strong\u003e. Limit DC switching to 15V or below. AC performance is excellent — tested at 1500W \/ 12.5A heater load without issues.\u003c\/p\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eArduino \/ ESP32 home automation — control 8 lights, fans, or appliances from a single board\u003c\/li\u003e\n\u003cli\u003eSmart home relay controller — MQTT \/ Home Assistant \/ Node-RED integration\u003c\/li\u003e\n\u003cli\u003eIrrigation system — control 8 solenoid valves for zone-based watering\u003c\/li\u003e\n\u003cli\u003eIndustrial PLC output expansion — 8-channel relay output card\u003c\/li\u003e\n\u003cli\u003eGreenhouse automation — lights, heaters, fans, misters, CO₂ valves\u003c\/li\u003e\n\u003cli\u003e3D printer enclosure control — lights, exhaust fan, filament dryer\u003c\/li\u003e\n\u003cli\u003eEscape room and prop control — 8 independently triggered effects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × 8-Channel Relay Module 5V (10A SPDT, active-low, opto-isolated, with screw terminals)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45681476042987,"sku":"","price":22.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/Relay-Module-8-x-5V-1.jpg?v=1723005869","url":"https:\/\/keszoox.com\/products\/8-channel-relay-module-5v-10a-spdt-active-low-opto-isolated-arduino","provider":"Keszoox","version":"1.0","type":"link"}