A 4-channel 12V USB relay module with low-level trigger inputs, opto-isolation, and high current relays—perfect for automation, Arduino, and PC control projects.
4-channel 12V USB relay module ideal for Arduino, Raspberry Pi, and industrial automation projects.
Features low-level trigger inputs for reliable and responsive relay control.
Includes USB interface for plug-and-play operation on Windows and Linux systems.
Each relay supports up to 10A at 250V AC or 30V DC with opto-isolated inputs for protection.
LED indicators show real-time relay status for easy debugging and monitoring.
The 4 Channel 12V USB Relay Module is an efficient and compact switching solution designed for hobbyists, engineers, and automation projects. Featuring four independent channels, this USB-controlled board enables seamless control of high voltage devices via low-level trigger signals, making it ideal for microcontroller and PC-based control systems. The 4 Channel 12V USB Relay Module supports a low level trigger relay input, enhancing compatibility with Arduino, Raspberry Pi, and other platforms.
Thanks to its onboard USB interface, no external power or complex wiring is required—simply connect it to a 12V power source and control it directly via USB. Moreover, it uses high-quality relays (SRD-12VDC-SL-C) capable of handling up to 10A at 250V AC or 30V DC, ensuring robust switching performance. This USB relay board is widely used in smart home setups, DIY electronics, and industrial control systems.
Importantly, its opto-isolated input design provides additional protection against voltage spikes, while its onboard indicators offer real-time relay status. Whether you’re working on automation, testing equipment, or IoT applications, this Arduino compatible relay delivers flexibility, reliability, and performance.
Furthermore, the board supports most major operating systems including Windows and Linux, with driver and control software readily available online. If you’re looking for a dependable, plug-and-play solution, the 4 Channel 12V USB Relay Module is an outstanding choice.
Specifications:
Relay Channels: 4
Operating Voltage: 12V DC
Trigger Type: Low level trigger
Control Interface: USB 2.0
Relay Model: SRD-12VDC-SL-C
Relay Contact Rating: 10A 250V AC / 10A 30V DC
Opto-Isolated Inputs: Yes
Board Dimensions: Approx. 75mm x 55mm
Operating System Support: Windows, Linux
Indicators: Power and relay status LEDs
Communication Type: Virtual COM port (USB to Serial)
Features:
Four-channel USB relay board with low level triggering
Compatible with Arduino, Raspberry Pi, and other microcontrollers
We ship Australia-wide to all addresses, including PO Box, Parcel Locker, etc. The following shipping options available are listed below:Â
Standard Shipping – Free (low cost / small products orders under $35 AUD) – Sent via standard Australia Post stamped mail, this shipping option has no tracking and support other than messages from Phipps Electronics to confirm the package has been dispatched to Australia Post.
Parcel Shipping (higher cost / larger products orders over $35 AUD or Postage paid at checkout) – Sent via Australia Post Parcel Service or Courier Service, this shipping option has full tracking.
Express Post – Sent via Australia Post Express Service, this shipping option has full tracking.
View the table below for shipping time estimates for Australian orders. These estimates are based on Australia Post's recent delivery performance and do not take into account any current disruptions which may affect delivery time.
State
Stamped Postage
Parcel Post
Express Post
NSW
Up to 4 business days
2 - 4 business days
1 - 2 business days
VIC
3 - 6 business days
3 - 5 business days
2 - 3 business days
QLD
3 - 6 business days
3 - 5 business days
2 - 3 business days
SA
4 - 7 business days
4 - 6 business days
2 - 3 business days
WA
6 - 12 business days
6 - 8 business days
2 - 3 business days
TAS
5 - 7 business days
5 - 6 business days
2 - 3 business days
ACT
3 - 6 business days
2 - 4 business days
1 - 2 business days
NT
7 - 12 business days
7 - 10 business days
3 - 4 business days
New Zealand Orders
We ship to New Zealand, to all addresses, including PO Boxes. Packages shipped to New Zealand are sent through Australia Post with 2 shipping options available.
Standard Parcel
Express Parcel
View the table below for shipping time estimates for orders to New Zealand. These estimates are based on Australia Post's recent delivery performance and do not take into account any current disruptions which may affect delivery time.
Country
Standard Parcel
Express Parcel
New Zealand
7 - 12 business days
5 - 8 business days
International Orders
We ship to most countries worldwide, there may be limitations on the addresses they can be delivered based on each individual country. Orders are shipped by Australia Post, in the rare circumstance that Australia Post can't deliver to the selected country we will attempt to ship with another shipping service.
View the link below for shipping time estimates. These estimates are based on Australis Post's recent delivery performance and do not take into account any current disruptions which may affect delivery time.
If you have any questions, please have a look at the customer service portal where you will find answers to many common questions, or you can reach out to us through the contact us page.
