Products for USB Sensing and Control

Products for USB Sensing and Control


Unit 1 - 6115 4 St SE
Calgary AB  T2H 2H9
+1 403 282-7335

Dual SSR Relay Board

ID: 3053_0

Switch 2 SSRs rated for 28VAC/9amp or 40VDC/9amp using digital outputs.


Quantity Available: 1000+

Qty Price
5 $28.50
10 $27.00
25 $24.00
50 $21.00
100 $19.50

Solid State Relays, or SSRs, are devices designed to operate like standard relays but without mechanical motion.

The SSR Board is safe to use with sensitive control devices like microprocessors, and will not damage a Phidget device or your PC. Optoisolation between the control inputs and outputs of the SSR in the form of a GaAs LED paired with a set of optically-controlled MOSFETs provides protection from output to input. An on-board 47V bidirectional transorb across the relay output protects the board from static electricity and surges from inductive loads.

Product Specifications

Electrical Properties
Relay Output Type MOSFET
Isolation Method Photoelectric
Dielectric Strength 5.3 kV AC
Control Voltage Min 3 V DC
Control Voltage Max 30 V DC
Control Current 10 mA
Load Voltage Max (DC) 40 V DC
Load Voltage Max (AC) 28 V AC
Load Current Max (AC) (per channel) 9 A
Load Current Max (DC) (per channel) 9 A
Turn-on Time Max 1.9 ms
Turn-off Time Max 0.16 ms
Contact Resistance Max 50 mΩ
Switching Speed Max 300 cps
Physical Properties
Recommended Wire Size (Control) 16 - 26 AWG
Recommended Wire Size (Load) 12 - 24 AWG
Operating Temperature Min -40 °C
Operating Temperature Max 100 °C


Product History

Date Board Revision Device Version Comment
May 2010 0 N/A Product Release

Getting Started

Welcome to the 3053 user guide! In order to get started, make sure you have the following hardware on hand:

Next, you will need to connect the pieces:

3053 0 Connecting The Hardware.jpg
  1. Connect the circuit to one of the load terminals of the 3053.
  2. Attach the 3053 to your 1018 by connecting a wire from the terminal block marked with a + to a Digital Output and another wire from the terminal block marked with a - to any ground terminal on the 1018.
  3. Connect the 1018 to your computer using a USB cable.

Now that you have everything together, let's start using the 3053!

Using the 3053

Phidget Control Panel

In order to demonstrate the functionality of the 3053, we will connect it to the 1018, and then run an example using the Phidget Control Panel on a Windows machine.

The Phidget Control Panel is available for use on both macOS and Windows machines. If you would like to follow along, first 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 3053.

First Look

After plugging in the 3053 into the 1018, and the 1018 into your computer, open the Phidget Control Panel. You will see something like this:

1018 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:

1010 1018 1019DigitalOutput OnOff 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. This will change the relay state.

Technical Details


Solid State Relays, or SSRs, are devices designed to operate like standard relays but without mechanical motion. Built instead out of silicon transistors, SSRs allow currents and voltages to be switched by simple digital signals from a microprocessor or any other device that can supply the small amount of current needed to activate the SSR’s internal switching mechanism. For more information on solid state relays, refer to the SSR Primer.

Using the SSR Board

Using the SSR Relay Board in your application is typically done according to the diagram on the right, though there are other implementations for it as well. The SSR control inputs can be controlled with a wide range of voltage levels between 3 and 30V. Be sure to match the polarity of the control signal with the ± labels on the input terminal blocks. One concern with any type of relay is the turn-on and turn-off times. Since the SSR Board uses optoisolation, the turn-on delay depends on how strong the control signal is, while the turn-off delay is quite constant, and quick. The 3053 uses internal circuitry to keep the current of the control signal around 10mA, no matter how what voltage level is used. To improve the turn-on time of the SSR, a short current spike (approximately 35mA for 300μs) at turn-on is possible if your control signal can provide it. This allows the SSR to turn on quicker, reducing heating during the turn-on transition. If your control signal is not able to provide the 35mA, the SSR will turn on anyway, but will take up to 50% longer.

3053 0 Diagram.jpg

Isolation and Protection Devices

The SSR Board is safe to use with sensitive control devices like microprocessors, and will not damage a Phidget or your PC. This is achieved through the use of an optoisolation chip - creating a physical barrier between the SSR control inputs and the potentially high voltage and high current outputs. In addition to the optoisolation between the inputs and outputs, there is an on-board 47V voltage supression device across the relay output that protects the board from static electricity and surges from inductive loads. To protect the optoisolation LEDs from potential overcurrent on the inputs, a transistor-based current limiting circuit has been added. The circuit limits the constant current travelling through the LEDs to 10mA, regardless of the input voltage. The transistors dissipate what would have been extra current in the form of heat. The 3053 Dual SSR Board comprises of two channels. Both channels are electrically and physically isolated from each other, and are controlled individually.


The SSR Board is able to safely switch at a speed of 20Hz. This board is not intended as a high frequency switch due to the extreme heating that will occur. Although it is possible to switch the SSR Board at up to 300Hz, it easily produces enough heat to liquefy the solder underneath the transistors (which requires at least 240°C) at a 3A load.

What to do Next

  • Software Overview - Find your preferred programming language here to learn how to write your own code with Phidgets!
  • General Phidget Programming - Read this general guide to the various aspects of programming with Phidgets. Learn how to log data into a spreadsheet, use Phidgets over the network, and much more.
  • Phidget22 API - The API is a universal library of all functions and definitions for programming with Phidgets. Just select your language and device and it'll give you a complete list of all properties, methods, events, and enumerations that are at your disposal.


You can protect your board from dust and debris by purchasing an enclosure. An enclosure will also prevent unintentional shorts caused by objects touching the pins on the bottom of the board or any terminal screws.

Product Physical Properties
Image Part Number Price Material
3822_2 $8.00 Clear Acrylic

InterfaceKits and Hubs

This relay board is controlled by digital outputs. Just connect the '+' terminal to the digital output and the '-' terminal to the ground on your InterfaceKit or Hub using a bit of wire.

Product Digital Outputs
Image Part Number Price Number of Digital Outputs Digital Output Current Max Digital Output Voltage Max
1010_0 $80.00 8 16 mA 5 V DC
1011_0 $50.00 2 16 mA 5 V DC
1018_2 $80.00 8 16 mA 5 V DC
1019_1 $115.00 8 16 mA 5 V DC
1073_0 $140.00 8 16 mA 5 V DC
1203_2 $125.00 8 16 mA 5 V DC
HUB0000_0 $30.00 6 (Shared) 3.3 V DC
OUT1100_0 $15.00 4 16 mA 5 V DC

Have a look at our relay boards:

Product Electrical Properties
Image Part Number Price Load Current Max (AC) Load Voltage Max (AC) Load Current Max (DC) Load Voltage Max (DC)
1012_2 $100.00
1014_2 $60.00 10 A 250 V AC 5 A 100 V DC
1017_1 $90.00 2 A 250 V AC 2 A * 120 V DC
3051_1 $19.00 10 A 240 V AC 5 A 100 V DC
3052_1 $15.00 2.5 A 28 V AC 2.5 A 40 V DC
3053_0 $30.00 (per channel) 9 A 28 V AC (per channel) 9 A 40 V DC
3054_0 $10.00 500 mA 28 V AC 500 mA 40 V DC
REL1000_0 $30.00 12 A 277 V AC 5 A * 100 V DC
REL1100_0 $25.00 8 A 30 V DC
REL1101_0 $50.00 8 A 30 V DC
REL2001_0 $10.00 12 A 277 V AC 5 A * 100 V DC
REL2002_0 $12.00 2 A 240 V AC 2 A 120 V DC