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16-Channel 5V Relay Module with Optocoupler, Low-Level Trigger

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16-Channel 5V Relay Module with Optocoupler, Low-Level Trigger

Brand NZN Electronics CLICK IT SKU CLICK-IT-912408 Category Components

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  • Brand NZN Electronics

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Overview

A 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.

Only need a few circuits? See the 4-Channel 5V Relay Module. Using an ESP32 or Pico? The 1-Channel 3.3V Relay Module is made for 3.3V boards.

Specifications

Supply5V DC, about 1.2A with all relays on
Channels16, independently controlled
Load limit, AC10A at 250VAC, 15A at 125VAC per channel
Load limit, DC10A at 30VDC per channel
ContactsSPDT per channel: COM, NO and NC
TriggerLow level: 0-2V switches the relay on
Input currentAbout 3mA per input
IsolationOptocoupler on every input
PCB size178.9 x 90 mm

Datasheets

Full technical datasheetPDF

What’s in the box

1×
16-Channel 5V Relay Module

Assembled board with screw terminals and input header fitted.

Great for

Multi-zone garden or greenhouse watering from an Arduino Mega
Lighting and control panels with many separate circuits
Adding relay outputs to home automation and PLC-style projects

Wiring & getting started

  1. Power the board

    Connect 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.

  2. Connect the inputs

    Run 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.

  3. Test each channel

    With 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.

  4. Connect the loads

    Turn 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.

Note: 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.

Specification

Specification for 16-Channel 5V Relay Module with Optocoupler, Low-Level Trigger
CLICK IT SKU CLICK-IT-912408
Brand NZN Electronics

Features

A 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…

  • Brand NZN Electronics

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