PortaPow USB Power Blocker - Stops Charging, Allows Data (Single Pack)

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).

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.

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.

I recently started using the PortaPow USB Power Blocker with my micro USB cable for my 3D printer, and I have to say, it's been a game-changer! This little gadget does an excellent job of preventing my printer from pulling too much power from my sonic pad, which could potentially damage it. It stops charging while still allowing data transfer, ensuring that my devices stay safe and sound. Installation was a breeze - I simply plugged it in between my printer and the sonic pad, and it started working right away. Plus, it's super compact, so it doesn't take up much space. Overall, I'm incredibly impressed with the PortaPow USB Power Blocker. It's a simple yet effective solution that gives me peace of mind knowing that my devices are protected. Five stars from me!

This product works as intended for blocking power on the usb, but did not work with the products I had wanted to use it with. But I was impressed with the how sturdy the build quality of this is. I own a Schiit Modius and Bifrost (gen 3 usb), both devices are recognized via usb with this device, but would not output anything. Both devices had independent power of the computers usb. The problem I wanted to solve is either EMI noise or a usb ground loop from a high power gaming computer. When either dac is connected via usb, they pick up a lot of electrical noise when the computer is in high power states. The noise comes through on the Modius even if on a different input, the computer usb has to be completely disconnected (seperate usb power via wall wart and optical from the computer are crystal clear). Unfortunately, the same noise is coming through to the DACs with the power blocked via this device... So the usb is dirty on just the data pins. I have ordered a slightly more expensive usb isolator and filter to try...

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.

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.

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.

Works as advertised. Blocks the power. I use it with an Android Auto external device because the data+power USB port in my car remains active for an extended period after turning off the car. So I added a splice to draw power from another port (that is off when the car is off) and then only allow data in the primary port. Works perfectly.

Fait parti d'un petit montage dans la voiture pour alimenter le boitier Android Auto sans fil. Le boitier est bien alimenté uniquement quand le moteur tourne. (la connexion se rétablissait avec le téléphone quand je sortait pour aller dans le jardin ou que je bricolais dans le garage). Problème résolu, ça fonctionne depuis 15 jours.

Kör Octopi / Octoprint med min Raspberry Pi till min 3D printer. Denna blockerar strömöverföring via USB vilket var exakt det jag var ute efter. Produkten skulle kunna vara ännu mindre i storlek, om man får önska något.

Hace lo que promete.

They work exactly as described