{"product_id":"16-channel-5v-relay-module","title":"16-Channel 5V Relay Module with Optocoupler, Low-Level Trigger","description":"\u003cdiv class=\"nznpd\"\u003e\n\u003cdiv class=\"nznpd__lead\"\u003e\u003cp class=\"nznpd__intro\"\u003eA 16-channel relay board that lets an Arduino Mega or other 5V controller switch sixteen separate circuits on and off independently. Each relay handles up to 10A at 250VAC, every input goes through an optocoupler, and the inputs are low-level trigger: pull a pin low to switch its relay on.\u003cbr\u003e\u003cbr\u003eOnly need a few circuits? See the \u003ca href=\"\/products\/4-channel-5v-relay-module-with-high-low-trigger\"\u003e4-Channel 5V Relay Module\u003c\/a\u003e. Using an ESP32 or Pico? The \u003ca href=\"\/products\/1-channel-3-3v-relay-module-with-high-low-trigger\"\u003e1-Channel 3.3V Relay Module\u003c\/a\u003e is made for 3.3V boards.\u003c\/p\u003e\u003c\/div\u003e\n\u003csection class=\"nznpd__block\"\u003e\u003ch3 class=\"nznpd__h\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__specs\"\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eSupply\u003c\/span\u003e\u003cstrong\u003e5V DC, about 1.2A with all relays on\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eChannels\u003c\/span\u003e\u003cstrong\u003e16, independently controlled\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eLoad limit, AC\u003c\/span\u003e\u003cstrong\u003e10A at 250VAC, 15A at 125VAC per channel\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eLoad limit, DC\u003c\/span\u003e\u003cstrong\u003e10A at 30VDC per channel\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eContacts\u003c\/span\u003e\u003cstrong\u003eSPDT per channel: COM, NO and NC\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eTrigger\u003c\/span\u003e\u003cstrong\u003eLow level: 0-2V switches the relay on\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eInput current\u003c\/span\u003e\u003cstrong\u003eAbout 3mA per input\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eIsolation\u003c\/span\u003e\u003cstrong\u003eOptocoupler on every input\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003ePCB size\u003c\/span\u003e\u003cstrong\u003e178.9 x 90 mm\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"nznpd__block\"\u003e\u003ch3 class=\"nznpd__h\"\u003eDatasheets\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__ds\"\u003e\u003ca class=\"nznpd__dsbar\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/REL-16CH-5V-Datasheet-v2.pdf\" target=\"_blank\" rel=\"noopener\" aria-label=\"Download the REL-16CH-5V datasheet (PDF)\"\u003e\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003cspan\u003eFull technical datasheet\u003c\/span\u003e\u003cspan class=\"nznpd__dsmeta\"\u003ePDF\u003csvg width=\"17\" height=\"17\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4\"\u003e\u003c\/path\u003e\u003cpolyline points=\"7 10 12 15 17 10\"\u003e\u003c\/polyline\u003e\u003cline x1=\"12\" y1=\"15\" x2=\"12\" y2=\"3\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"nznpd__block\"\u003e\u003ch3 class=\"nznpd__h\"\u003eWhat's in the box\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__included\"\u003e\n\u003cdiv class=\"nznpd__qty\"\u003e1×\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e16-Channel 5V Relay Module\u003c\/strong\u003e\u003cp\u003eAssembled board with screw terminals and input header fitted.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"nznpd__block\"\u003e\u003ch3 class=\"nznpd__h\"\u003eGreat for\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__uses\"\u003e\n\u003cdiv class=\"nznpd__use\"\u003eMulti-zone garden or greenhouse watering from an Arduino Mega\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eLighting and control panels with many separate circuits\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eAdding relay outputs to home automation and PLC-style projects\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"nznpd__block\"\u003e\u003cdiv class=\"nznpd__qs\"\u003e\n\u003ch3\u003eWiring \u0026amp; getting started\u003c\/h3\u003e\n\u003col class=\"nznpd__steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003ePower the board\u003c\/strong\u003e\u003cp\u003eConnect a regulated 5V DC supply rated 2A or more to the power terminal, following the polarity printed beside it. Join its ground to your controller's ground. Do not power it from an Arduino 5V pin or a USB port.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect the inputs\u003c\/strong\u003e\u003cp\u003eRun one controller output to each IN terminal you use on the header (IN1 to IN16). In your code, write each pin HIGH before setting it as an output, so the relays stay off while the controller starts.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eTest each channel\u003c\/strong\u003e\u003cp\u003eWith nothing on the contacts, pull each input low in turn. That relay should click and its indicator light, and its COM should connect to NO. When released, COM connects to NC.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect the loads\u003c\/strong\u003e\u003cp\u003eTurn everything off. Run each load circuit through its channel's COM and NO to switch it on when triggered, or COM and NC to switch it off when triggered. Stay within the load limits on every channel.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003cp class=\"nznpd__note\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Mains voltage can kill. Only wire mains loads if you are competent to do so, fully enclose the board so no terminal or solder joint can be touched, and follow NZ electrical safety rules. Motors and lamps draw a surge at switch-on, so leave margin below the limits.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"NZN Electronics","offers":[{"title":"Default Title","offer_id":67621814763616,"sku":"REL-16CH-5V","price":40.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/16-channel-5v-relay-module-hero-v2.png?v=1791363937","url":"https:\/\/www.nznelectronics.co.nz\/products\/16-channel-5v-relay-module","provider":"NZN Electronics","version":"1.0","type":"link"}