---
product_id: 3243676
title: "USB Eight Channel Relay Board for Automation - 12 V"
brand: "sainsmart"
price: "39344CFA"
currency: XOF
in_stock: true
reviews_count: 9
category: "Sain Smart"
url: https://www.desertcart.sn/products/3243676-usb-eight-channel-relay-board-for-automation-12-v
store_origin: SN
region: Senegal
---

# Supports up to 10A switching current 8 SPDT relays for versatile control Extra PCB openings for voltage isolation USB Eight Channel Relay Board for Automation - 12 V

**Brand:** sainsmart
**Price:** 39344CFA
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your automation game with 8-channel power and precision!

## Quick Answers

- **What is this?** USB Eight Channel Relay Board for Automation - 12 V by sainsmart
- **How much does it cost?** 39344CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/3243676-usb-eight-channel-relay-board-for-automation-12-v)

## 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

- • **Power Your Automation:** 8 independent SPDT relays deliver precise multi-channel control for complex setups.
- • **Built for High Current:** Handles up to 10 Amps per channel, perfect for demanding industrial and DIY projects.
- • **Safe & Stable Operation:** Extra PCB openings enhance voltage isolation, reducing interference and boosting reliability.
- • **Plug & Play USB Interface:** Seamlessly integrates with your PC via USB, supported by dedicated Relay Manager software.
- • **Compact & Panel Mount Ready:** Sleek 4.8 x 3.7 inch design fits easily into control panels or custom enclosures.

## Overview

The SainSmart USB Eight Channel Relay Board is a robust 12V automation solution featuring 8 SPDT relays capable of switching up to 10 Amps each. Designed with extra PCB openings for enhanced voltage isolation and doubled high current tracks, it ensures reliable and safe operation. Its USB interface and dedicated software support make it ideal for industrial, scientific, and DIY automation projects requiring precise multi-channel control.

## Description

desertcart.com: SainSmart USB Eight Channel Relay Board for Automation - 12 V : Industrial & Scientific

Review: works - I purchased this to switch contacts in a data acquisition setup. It works well, all relays function correctly. The 'Relay Manager' program that you can download from the link (and their website) works perfectly. I am having only one issue. I am using LabVIEW to control the board and I cannot get the given (from the download link) library files to open the board. That is, I can run the Open file and get an OK error status in return (it will return various error statuses, depending on the result) but the board will not actually open. I can get the device description, location and handle, but no communication connection. I tried a USB sniffer to check the data going over the port but couldn't seem to find what I was looking for. I contacted the company and was given all the information that I already had. They were very prompt and courteous, but no real help. I never spoke with a programmer, only a secretary or some such. The problem may be with LabVIEW but seems to be some command that I don't know since I can send other commands correctly. I am running Windows 7 and that may be an issue since the library files were written several years ago, although they have stated that they are compatible with this version of Windows and I am not having any other problems. Anyway, my solution (until I can figure out what to do) is to open the board with the 'Relay Manager' and then send commands to the board as I like using my LabVIEW program. I only have to open the board once until I restart my computer and can close the Relay Manager (the initial handshake, whatever it is, remains) and open and close LabVIEW as often as I like with no problems. Now, I had to experiment to find the commands to turn the relays on and off because I could not get their supplied commands to work. I tried and tried and might try some more later but I found what I need through trial and error so it's not an urgent issue right now. As an example, the company said to use FF 01 01 to turn on channel 1. I couldn't get that to work and use 11 instead. So, since the problem seems to be with my programming (although the given D2XX commands don't list anything to cover how to get an initial handshake and I have installed all of the necessary .net files and various drivers) I know that the board works (since their program works well) and I have found the commands to do what I want... I will give it five stars. The board is capable of allowing interface with external switches and will be very useful once I figure out how to get full control over it. edit: For those that are interested, I found the commands for this board (chip). I got a little time and decided to make a program like the one that is provided by the company. I was (once again) trying in vain to get their commands to work and finally just decided to try everything. Well, it turns out that it's pretty simple. After various combinations I found that the on/off state of the switches (relays) are simply represented by binary code from 0 to 255. That is, 00000001 (1 decimal, 01 hex) gives relay #1 on (rest off); 11111111 (255 decimal, FF hex) gives all relays on; 00101101 (45 decimal, 2D hex) gives relays 1, 3, 4, 6 on and the rest off; etc. Also, the communication problem was likewise easily fixed with a little attention to detail. Have fun.
Review: dof for visual pinball x - set this up for dof with my virtual pinball table. works easily. if you have issues with it disconnecting check the solenoids you are working.

## Features

- 8 SPDT relays SRD-12VDC-SL-C
- Supported by our software
- Extra PCB openings for better voltage isolation
- Doubled high current tracks

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0093Y89DE |
| Best Sellers Rank | #105,491 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #38 in Solid State Relays |
| Brand | SainSmart |
| Coil Voltage | 12 Volts |
| Connector Type | Solder |
| Contact Material | Copper |
| Contact Type | Spdt |
| Current Rating | 10 Amps |
| Date First Available | August 30, 2012 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 4.2 ounces |
| Item model number | 8541582310 |
| Manufacturer | SainSmart |
| Maximum Switching Current | 10 Amps |
| Maximum Switching Voltage | 12 Volts |
| Minimum Switching Voltage | 11 Volts |
| Mounting Type | Panel Mount |
| Operation Mode | Automatic |
| Product Dimensions | 4.8 x 3.7 x 1.26 inches |
| Wattage | 120 watts |

## Product Details

- **Connector Type:** Solder
- **Contact Material:** Copper
- **Contact Type:** Spdt
- **Current Rating:** 10 Amps
- **Mounting Type:** Panel Mount

## Images

![USB Eight Channel Relay Board for Automation - 12 V - Image 1](https://m.media-amazon.com/images/I/6162rh6ZAGL.jpg)

## Questions & Answers

**Q: The unit is functioning as expected. However, after it's use more, the unit cause computer to crash, when turning the on/Off a few time, the program hang up on the write command. The computer needed to reboot to recover. Any idea about this issue ? There are posts on the web that shows the similar issues. Do you have  …**
A: i know this question is old, but other people might be having the same problem. 
I had the same problem after so much iteration of write. what i did was clear the cache. the memory can only hold so much write before it hangs. I clear the cache before every write. it worked for me

**Q: Do they provide a tool to control the board through command line?**
A: You can download a sample tool from them which controls it via gui.  I never saw a command line tool.  It wasnt hard to integrate their commands into my own platform so a basic coder could probably make you a command line tool.

**Q: Can this be used to give nc / no contacts?**
A: I'm not sure of your question. This card has eight relays. Each relay has three screw clamp terminals where one is normally open, one is normally closed and the last is the common. So you can wire your device(s) to any or all relays in either normally open or closed position as you like. I hope this clarifies things.

**Q: I want use as programmable sequential controller for  my business led street sign, this unit need computer for program only or need computer to run.**
A: You would need it connected to a computer. This unit does not have any sort of programmable timers or states. It is more or less a light switch you control via a computer button.

## Customer Reviews

### ⭐⭐⭐⭐⭐ works
*by G***S on July 26, 2013*

I purchased this to switch contacts in a data acquisition setup. It works well, all relays function correctly. The 'Relay Manager' program that you can download from the link (and their website) works perfectly. I am having only one issue. I am using LabVIEW to control the board and I cannot get the given (from the download link) library files to open the board. That is, I can run the Open file and get an OK error status in return (it will return various error statuses, depending on the result) but the board will not actually open. I can get the device description, location and handle, but no communication connection. I tried a USB sniffer to check the data going over the port but couldn't seem to find what I was looking for. I contacted the company and was given all the information that I already had. They were very prompt and courteous, but no real help. I never spoke with a programmer, only a secretary or some such. The problem may be with LabVIEW but seems to be some command that I don't know since I can send other commands correctly. I am running Windows 7 and that may be an issue since the library files were written several years ago, although they have stated that they are compatible with this version of Windows and I am not having any other problems. Anyway, my solution (until I can figure out what to do) is to open the board with the 'Relay Manager' and then send commands to the board as I like using my LabVIEW program. I only have to open the board once until I restart my computer and can close the Relay Manager (the initial handshake, whatever it is, remains) and open and close LabVIEW as often as I like with no problems. Now, I had to experiment to find the commands to turn the relays on and off because I could not get their supplied commands to work. I tried and tried and might try some more later but I found what I need through trial and error so it's not an urgent issue right now. As an example, the company said to use FF 01 01 to turn on channel 1. I couldn't get that to work and use 11 instead. So, since the problem seems to be with my programming (although the given D2XX commands don't list anything to cover how to get an initial handshake and I have installed all of the necessary .net files and various drivers) I know that the board works (since their program works well) and I have found the commands to do what I want... I will give it five stars. The board is capable of allowing interface with external switches and will be very useful once I figure out how to get full control over it. edit: For those that are interested, I found the commands for this board (chip). I got a little time and decided to make a program like the one that is provided by the company. I was (once again) trying in vain to get their commands to work and finally just decided to try everything. Well, it turns out that it's pretty simple. After various combinations I found that the on/off state of the switches (relays) are simply represented by binary code from 0 to 255. That is, 00000001 (1 decimal, 01 hex) gives relay #1 on (rest off); 11111111 (255 decimal, FF hex) gives all relays on; 00101101 (45 decimal, 2D hex) gives relays 1, 3, 4, 6 on and the rest off; etc. Also, the communication problem was likewise easily fixed with a little attention to detail. Have fun.

### ⭐⭐⭐⭐⭐ dof for visual pinball x
*by E***G on March 22, 2025*

set this up for dof with my virtual pinball table. works easily. if you have issues with it disconnecting check the solenoids you are working.

### ⭐⭐⭐ NOT opto isolated - Doesn't use serial drivers - Doesn't have transient suppression
*by J***X on January 26, 2021*

Seems to work ok, but impossible to get it working on a Mac with Catalina (and maybe Mojave), because Mac OS X doesn't let you manipulate HID devices. Works fine with the supplied Windows executable, but the "send 0xFF, channel, state" approach doesn't work. You can make it work with Linux - libusb, and so forth. A significant problem is that the relay coils are operated off the 12V source - which is sort of fine, but if you have a load that kicks out significant transients (i.e. another relay), you will fry the output side of the relay drivers or worse, your computer's USB interface. It's still recognized by the computer on the USB side, but the relays don't actuate (nor do the tally LEDs illuminate). Still seems to be an OK device, but needs some sophistication in use that's not described in any of the user docs (which are incredibly sketchy.. they don't even tell you which terminal is which on the relay).

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-01-28*