Capable of switching up to 10 amps of current in either AC or DC, If you're looking for a convenient way to control power for a circuit or device up to a maximum of 30V, this is the Phidget you need. Solid state relays switch silently and quickly, and last much longer than mechanical relays. This Phidget is isolated from input to output, so you don't have to worry about damaging your VINT Hub or computer if you have a power surge on the load side.


This Phidget can be controlled with a VINT Hub. For more details, see the Connection & Compatibility tab.

Product Specifications

Board Properties
Controlled By Digital Output (5V)
Relay Properties
Turn-off Time Max 50 ns
Turn-on Time Max 50 ns
Electrical Properties
Current Consumption Max 20 mA
Isolation Voltage (AC) 3.8 kV AC
Load Voltage Max (AC) 30 V AC
Load Voltage Max (DC) 30 V DC
Load Current Max (AC) 10 A
Load Current Max (DC) * 10 A
* - If you need to switch a DC circuit at over 10A, take a look at the technical section of the user guide for wiring that will permit up to 20A.


Getting Started

Welcome to the REL2103 user guide! In order to get started, make sure you have the following hardware on hand:

Next, you will need to connect the pieces:

REL2103 Functional.jpeg

  1. Connect the REL2103 to the VINT Hub using the Phidget cable.
  2. Connect the VINT Hub to your computer with a USB cable.
  3. Connect the circuit to the the two outer terminals (The inner "SRC" terminals are not necessary unless you're switching more than 10A DC. See the technical section for details).

Now that you have everything together, let's start using the REL2103!

Using the REL2103

Phidget Control Panel

In order to demonstrate the functionality of the REL2103, the Phidget Control Panel running on a Windows machine will be used.

The Phidget Control Panel is available for use on both macOS and Windows machines.


To open the Phidget Control Panel on Windows, find the Ph.jpg icon in the taskbar. If it is not there, open up the start menu and search for Phidget Control Panel

Windows PhidgetTaskbar.PNG


To open the Phidget Control Panel on macOS, open Finder and navigate to the Phidget Control Panel in the Applications list. Double click on the Ph.jpg icon to bring up the Phidget Control Panel.

For more information, take a look at the getting started guide for your operating system:

Linux users can follow the getting started with Linux guide and continue reading here for more information about the REL2103.

First Look

After plugging the REL2103 into your computer and opening the Phidget Control Panel, you will see something like this:

REL2103 Panel.jpg

The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:

  • Serial number: allows you to differentiate between similar Phidgets.
  • Channel: allows you to differentiate between similar objects on a Phidget.
  • Version number: corresponds to the firmware version your Phidget is running. If your Phidget is listed in red, your firmware is out of date. Update the firmware by double-clicking the entry.

The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.

Digital Output

Double-click on a Digital Output object in order to run the example:

REL2103 DigitalOutput Example.jpg

General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:

  • Toggle the state of the digital output by pressing the button.

Technical Details


A solid state relay is an electrically-controlled switch. For more information about how SSRs work and how to use them, check the Solid State Relay Primer.

Using the SRC Terminals

The two middle pins on the REL2103, labelled "SRC" give you access to the source of the MOSFETs used to switch your circuit. The main advantage of this is that if you're switching a DC load, you can double the maximum current of this Phidget (from 10A to 20A).


The white schematic on the left shows a simplified version of the REL2103's circuitry: An optocoupler that activates two MOSFETs. The black schematic on the right shows how you would hook up a DC circuit to take advantage of the increased maximum current.

What to do Next

  • Programming Languages - Find your preferred programming language here and learn how to write your own code with Phidgets!
  • Phidget Programming Basics - Once you have set up Phidgets to work with your programming environment, we recommend you read our page on to learn the fundamentals of programming with Phidgets.

REL2103_0 - Solid State Relay Phidget

  • Brand: Phidgets
  • Product Code: 003003
  • Availability: In Stock
  • 18.75€