Products for USB Sensing and Control
Products for USB Sensing and Control


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Power Guard Phidget

ID: SAF2000_0

Protect your power supply from surges caused by sudden braking on a motor controller with this tiny Phidget.


Quantity Available: 414

Qty Price
5 $9.50
10 $9.00
25 $8.00
50 $7.00
100 $6.50
250 $6.00
500 $5.50
1000 $5.00

The new generation of motor controllers from Phidgets Inc. are able to rapidly change motor directions, strongly brake the motor, and produce power with regenerative braking. Battery powered systems can easily absorb these surges of power - but most Power Supplies will immediately fail if a power surge is detected on the output.

The SAF2000_0 has three functions:
  • Prevent power on the output from flowing back to the input
  • Clamp the output at 37 Volts during power surges, to protect the motor controllers
  • Conveniently convert a 5.5x2.1mm Power Jack to a terminal block
We strongly recommend using this Phidget according to the table below:

Recommended Use

Controller Motor Rated Current Suggested Power Guard
STC1000 Less than 1.5A None
STC1000 1.5A to 5A SAF2000
STC1000 Greater than 5A SAF1000
DCC1000 Less than 1A None
DCC1000 1A to 5A SAF2000
DCC1000 Greater than 5A SAF1000

Power Supplies

This Phidget protects a power supply between 0 and 30V DC. Check the product page or data sheet of the device being powered to determine how much current is needed and what voltage range is permissable. Select the power supply from the list below that matches your region's wall socket type.

Product Electrical Properties Physical Properties
Image Part Number Price Power Supply Voltage Min Power Supply Voltage Max Power Supply Current Wall Plug Style
3022_0 $10.00 11.4 V DC 12.6 V DC 2 A Australian
3023_1 $10.00 11.4 V DC 12.6 V DC 2 A European
3024_1 $10.00 11.4 V DC 12.6 V DC 2 A North American
3025_0 $10.00 11.4 V DC 12.6 V DC 2 A British
3080_0 $25.00 11.4 V DC 12.6 V DC 5 A Australian
3081_0 $25.00 11.4 V DC 12.6 V DC 5 A European
3082_0 $25.00 11.4 V DC 12.6 V DC 5 A North American
3083_0 $25.00 11.4 V DC 12.6 V DC 5 A British
3084_0 $4.50 11.4 V DC 12.6 V DC 500 mA European
3085_0 $4.50 11.4 V DC 12.6 V DC 500 mA North American
3086_0 $10.00 22.8 V DC 25.2 V DC 1 A North American
PSU4015_0 $20.00 21.6 V DC 26.4 V DC 1 A
PSU4016_0 $40.00 21.6 V DC 28.8 V DC 15 A
PSU4017_0 $75.00 20 V DC 26.4 V DC 15 A

Getting Started

Welcome to the SAF2000 user guide! In order to get started, make sure you have the following hardware on hand:

Next, you will need to connect the pieces:

SAF2000 Functional.jpeg
  1. Connect the power supply to the barrel jack on the SAF2000.
  2. Connect wires from the SAF2000's ground and power terminals to the device's ground and power terminals. Ensure that you use wire of appropriate gauge for the amount of current in your system.
  3. Follow the instructions on the User Guide for the powered device you're using.

Technical Details

The SAF2000 protects both your power supply and your device from voltage spikes caused by reverse EMF generated by braking and reversing DC motors. In the event of such a surge, it prevents current from flowing back into the power supply and clamps the powered device's supply voltage to a maximum of 37V, dissipating the excess power until the surge has passed.

This device uses a diode to prevent current flowing back into the power supply, so expect a slight drop in the voltage seen by the powered device when in normal operation.

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.

Product Specifications

Electrical Properties
Trip Voltage 37 V DC
Continuous Current 5 A
Physical Properties
Operating Temperature Max 85 °C
Operating Temperature Min -40 °C
Recommended Wire Size 16 - 26 AWG
Power Jack 5.5x2.1mm, Center Positive


Product History

Date Board Revision Device Version Comment
June 20170N/AProduct Release