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⚡ Keep your data flowing, power problems gone!
The PortaPow USB Power Blocker is a precision USB-A male to female adapter that disconnects the 5V power line while preserving USB 2.0 data signals up to 480 Mbps. Ideal for preventing power backfeed in devices like Raspberry Pi and 3D printers, it offers a clean, cable-free solution to protect sensitive electronics and reduce USB power noise in professional setups.
| ASIN | B094FYL9QT |
| Best Sellers Rank | #1,290 in USB Cables |
| Brand | PortaPow |
| Color | Red |
| Compatible Devices | PC |
| Connector Type | USB Type A |
| Customer Reviews | 4.5 out of 5 stars 1,054 Reviews |
| Global Trade Identification Number | 00027829469634 |
| Item Weight | 0.02 Kilograms |
| Manufacturer | PortaPow |
| Model Number | PP_PBC1 |
| Number of Items | 1 |
| Number of Ports | 2 |
| Power Plug Type | No Plug |
| UPC | 278294696340 027829469634 |
| Unit Count | 1.0 Count |
M**M
Work Perfectly
They work as intended, I'm using one with a Raspberry Pi (running Octopi) attached to an Ender 3 v2 printer to enable controlling the printer via Wi-Fi. Apparently you can damage your Raspberry Pi if you allow the Ender 3 v2 USB port to back feed power into it. This adapter severs the power lines while still allowing the two devices to communicate properly. It's far more elegant then modifying a USB cable. Devices wouldn't communicate at first but it was a bad cable not this adapter so make sure your USB cable is good. They're great value for the money, they can also be used to help eliminate USB power noise on some digital audio interfaces like the Scarlet series for example.
L**O
Does what it says on the tin.
Does exactly what it says is does. Prevents 5v power from reaching the device. Really only needed when dealing with self-powered devices that don't implement USB properly, which either try to backpower the host, or partially start only the 5v components. In the past I'd carve up a cable, and cut the 5v line, or modify the target device itself, and this is a bit easier of a solution. Things work well at 12Mbps (USB 1 "Full" speed). I have not tested with any 2.x devices, though the traces are pretty short, I would expect no issues. (All of my easily available 2.x devices are bus-powered, and they won't work for obvious reasons).
S**E
Does what it says!
Worked as advertised to ensure only data channels could be used.
C**R
Great when a RPI is connected to a 3D printer
Bought this so my OctoPrint running on a Raspberry Pi doesn't power my 3D printer. I wanted to be able to flip the power switch and shut it down. Impossible without this blocker. Good quality and value.
T**S
Fit for purpose
Blocking power drain from Raspberry Pi to 3D Printer
S**N
Power blocker worked as expected. Priced right.
Just what I needed to prevent my device from powering a host device I needed to access. Data continued to be available from my device. Good price.
L**B
Didn't work
I bought these to use CarPlay without constantly charging my phone battery. They didn't work. My car refused to acknowledge my phone was plugged in using this adapter. Waste of money.
G**M
Works perfectly for my wireless Carplay adapter.
Works perfectly for my wireless Carplay adapter. The car supplies power to the USB/data port even if the car is off so my phone would connect/stay connected to the adapter anytime I was near it. This dongle lets the data through and I use a USB splitter to get the power from the lighter socket which is not powered when the car is off. Kind of workaround but it works.
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