---
product_id: 71083111
title: "16-Channel 9-36V USB Relay Module"
brand: "sainsmart"
price: "€ 83.75"
currency: EUR
in_stock: true
reviews_count: 11
category: "Sain Smart"
url: https://www.desertcart.at/products/71083111-16-channel-9-36v-usb-relay-module
store_origin: AT
region: Austria
---

# Supports 9-36V DC power supply USB interface for seamless PC integration 16 SPDT relays for versatile control 16-Channel 9-36V USB Relay Module

**Brand:** sainsmart
**Price:** € 83.75
**Availability:** ✅ In Stock

## Summary

> ⚡ Command your devices like a pro — 16 channels of power at your fingertips!

## Quick Answers

- **What is this?** 16-Channel 9-36V USB Relay Module by sainsmart
- **How much does it cost?** € 83.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/71083111-16-channel-9-36v-usb-relay-module)

## Best For

- sainsmart enthusiasts

## Why This Product

- Trusted sainsmart brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Visual Feedback:** Individual LED indicators for each relay ensure instant status monitoring
- • **Wide Voltage Range:** Operates reliably from 9V to 36V DC to fit diverse setups
- • **Power Your Automation:** Handles up to 10A/250V for robust device switching
- • **Expand Your Smart Home:** Perfect for robotics, home automation, and custom electrical control
- • **Plug & Play USB Control:** Easily integrate with PCs and Raspberry Pi for smart projects

## Overview

The SainSmart 16-Channel 9-36V USB Relay Module is a versatile, opto-isolated relay board featuring 16 SPDT relays capable of switching up to 10A at 250V. Designed for seamless USB control, it supports a wide DC voltage range (9-36V) and includes LED indicators for each relay output, making it ideal for home automation, robotics, and custom electrical projects.

## Description

SPECIFICATION Maximum load: 10A/250V Power supply: DC 9V~36V LED for each relay output Power LED USB LED WHAT'S IN THE PACKAGE 1x 16-Channel USB Relay Module

Review: Mediocre, but ok for price paid. - As another has noted, do use the external power supply port and pull the jumper. It had issues just running off the usb power. I was also able to confirm the other report that sometimes if you go too fast a relay can miss a command, but I saw that more often on usb bus power. A good power supply makes it reliable and faster to respond. In my case I have hundreds of amps available. I wrote my own linux driver that waits for the reply to echo back before considering it applied. I can run this in fast process-level parallel and the reply messages can interleave. So I have a random-delay-then-retry logic to make sure it gets a correct acknowledgement. Seems to be reliable enough when I do that. See serial on then off, then parallel (don't wait for reply) on then off. That being said the rest of the world is at 115200 baud for usb serial. Why default to 9600? The ch340 family can go that fast if they changed one line of code. I also found that it's decently reliable if I close and reopen for write after every command while not waiting for a reply (about half as fast). Even though it's not perceptably any slower (at 9600 baud). That must mean the wait time before resending is clearly almost imperceptible. This means their microcontroller code is a little broken to not be handling these requests with pointer queues to a ring buffer, but they are actually doing work while they have listening turned off. I tried adding characters to pad space in time predictably. It didn't work. It's just oddly buggy when you go fast. Other then these notes, it appears to work decently enough. I'll be rewiring my van to use this to control all my 12v appliances. The LED indicator lights work well,
Review: Works great so far. - I’ve only run some test on it because the project it goes in is still a work in progress. But it works fine. I downloaded the software and seems pretty straight forward. Looks like it’s going to be just what I needed.

## Features

- This is USB controlled relay opto-isolated board with 16 SPDT relays.
- You can use it for simple ON/OFF switching electrical devices - home lights, DC motors, solenoids and others.
- It can help you building projects like robotics and home automation.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0793MZH2B |
| Best Sellers Rank | #761,336 in Automotive ( See Top 100 in Automotive ) #280 in Automotive Replacement Relay Control Module Relays |
| Brand | SainSmart |
| Brand Name | SainSmart |
| Coil Voltage | 36 Volts |
| Connector Type | Usb |
| Contact Current Rating | 10 Amps |
| Contact Material | Silver |
| Contact Type | Normally Open |
| Current Rating | 10 Amps |
| Customer Reviews | 3.6 out of 5 stars 42 Reviews |
| Manufacturer | SainSmart |
| Maximum Switching Current | 10 Amps |
| Maximum Switching Voltage | 36 Volts |
| Minimum Switching Voltage | 9 Volts |
| Mounting Type | PCB Mount |
| Operating Time | 0.5 Seconds |
| Operation Mode | Electrical |
| Part Number | USB Relay Module |
| Wattage | 90 watts |

## Product Details

- **Connector Type:** Usb
- **Contact Material:** Silver
- **Contact Type:** Normally Open
- **Current Rating:** 10 Amps
- **Mounting Type:** PCB Mount

## Images

![16-Channel 9-36V USB Relay Module - Image 1](https://m.media-amazon.com/images/I/71wb3DN51VL.jpg)
![16-Channel 9-36V USB Relay Module - Image 2](https://m.media-amazon.com/images/I/81uNE4knpJL.jpg)
![16-Channel 9-36V USB Relay Module - Image 3](https://m.media-amazon.com/images/I/61Gnty8ZToL.jpg)
![16-Channel 9-36V USB Relay Module - Image 4](https://m.media-amazon.com/images/I/81ZnxuY7ibL.jpg)
![16-Channel 9-36V USB Relay Module - Image 5](https://m.media-amazon.com/images/I/81HbZf+GuvL.jpg)

## Questions & Answers

**Q: Where can I download the software for this board ?**
A: Hi, you can download from this link:
http://s3.amazonaws.com/s3.image.smart/download/101-70-208/101-70-208.zip

**Q: is the ground pin of each channel connected together or each channel is totally isolated?**
A: Hi, the ground of the control terminals is connected together, and each channel at the input is completely isolated.

**Q: Why do the commands not work when input into a serial terminal connected to the com port assigned? using putty 9600bps 8n1 i have added \r\n**
A: Not sure what you entered there and if you have a proper serial port through the USB interface.
Note there are many bytes to fransfer including a checksum if I remember correctly.
(Did create some Python code which uses python usb)

**Q: Is it possible to expand this module to control more than 16 channels? If no, any other alternatives plz?**
A: You can use a RPI with for example 4 modules, but It's better using 8-Channel USB because it contains serial number, so you have the possibility to identifiy witch module you use. It isn't possible with 2 module 16 channels on a RPI.

## Customer Reviews

### ⭐⭐⭐⭐ Mediocre, but ok for price paid.
*by S***Y on August 11, 2025*

As another has noted, do use the external power supply port and pull the jumper. It had issues just running off the usb power. I was also able to confirm the other report that sometimes if you go too fast a relay can miss a command, but I saw that more often on usb bus power. A good power supply makes it reliable and faster to respond. In my case I have hundreds of amps available. I wrote my own linux driver that waits for the reply to echo back before considering it applied. I can run this in fast process-level parallel and the reply messages can interleave. So I have a random-delay-then-retry logic to make sure it gets a correct acknowledgement. Seems to be reliable enough when I do that. See serial on then off, then parallel (don't wait for reply) on then off. That being said the rest of the world is at 115200 baud for usb serial. Why default to 9600? The ch340 family can go that fast if they changed one line of code. I also found that it's decently reliable if I close and reopen for write after every command while not waiting for a reply (about half as fast). Even though it's not perceptably any slower (at 9600 baud). That must mean the wait time before resending is clearly almost imperceptible. This means their microcontroller code is a little broken to not be handling these requests with pointer queues to a ring buffer, but they are actually doing work while they have listening turned off. I tried adding characters to pad space in time predictably. It didn't work. It's just oddly buggy when you go fast. Other then these notes, it appears to work decently enough. I'll be rewiring my van to use this to control all my 12v appliances. The LED indicator lights work well,

### ⭐⭐⭐⭐⭐ Works great so far.
*by J***F on July 29, 2021*

I’ve only run some test on it because the project it goes in is still a work in progress. But it works fine. I downloaded the software and seems pretty straight forward. Looks like it’s going to be just what I needed.

### ⭐⭐ Does what it is supposed to do! (For a time that is)
*by M***D on October 26, 2020*

Previously used the old board from SainSmart with a doughterboard connector for USB. Poked for a long time to get that going from the raspberry Pi using python (as I had several of these boards hooked up and couldn't use GPIO). However that didn't work and the SainSmart customer support was not able to help. This board however was a breeze to hook up and it works like a charm. The external USB cable seems a bit wobbly inside the plug - but as this is the original USB connector I suppose that it is what you can do with the hook up. Good job SainSmart! === Addendum: About 2 month after.... ==== One relay simply died. It is switching (adible) and it is showing the state by LED, however the connection is not made anymore making it useless. As I was using the board sporadically this is ... a disappointment. Needless to say that exchanging the board is far more hassle than buying a new one. I rather spend twice the price but am sure that the relays do not die like that....

## Frequently Bought Together

- SainSmart 16-Channel 9-36V USB Relay Module
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- SainSmart USB 4 Channel DC 12V Relay Module Automation for Arduino Raspberry Pi DSP AVR PIC ARM

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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-06-08*