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Power bank blowing fuses?

Lisa Miles
Hi all


I have a question I hope some of you might know the answer to.


We've recently moved over from a builders electricity supply to a domestic supply on our new build house in France. The electrics have all been checked out and signed off by the Consuel.


I have a two port USB powerbank manufactured by a well known battery manufacturer (?) and I was trying to charge it up while I was there using a native two pin USB charger plug. It basically fried the charger plug but didn't trip the fuse on the main board... 


I then plugged it in to a four socket extension lead (two pin plug to three pin sockets) using a three pin charger plug I have. It blew the extension lead but again didn't trip the fuse on the main board. 


At first I thought it must be a fault with the powerbank but  when I got back to the UK, I plugged it into my usual charger and it charged up as normal... ??


What do you think the problem could be? 

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  • 0
    What are the 'monitors' that went out actually monitoring ?

    5V or 230? As above to trip the 230V requires a real fault.

    Also when you say 2 pin and 3 pin, are these actually, or really double insulated ?

    ~I have seen some cheap USB charger designs where the output is not isolated from the mains earth.


    Actually I also have seen one where one side of the mains was connected to the metal shell of the USB connector, which was a bit of a shock for the chap who bought it. Still, it was a cheapy internet purchase, with no recognisable maker's name, and all the approval marks under the sun, faked, so not too surprising. (opening it revealed a capacitor dropper and a bridge rectifier, and a Zener diode, so it was like that by design, not faulty.) Caveat Emptor and all that.
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  • 0
    What are the 'monitors' that went out actually monitoring ?

    5V or 230? As above to trip the 230V requires a real fault.

    Also when you say 2 pin and 3 pin, are these actually, or really double insulated ?

    ~I have seen some cheap USB charger designs where the output is not isolated from the mains earth.


    Actually I also have seen one where one side of the mains was connected to the metal shell of the USB connector, which was a bit of a shock for the chap who bought it. Still, it was a cheapy internet purchase, with no recognisable maker's name, and all the approval marks under the sun, faked, so not too surprising. (opening it revealed a capacitor dropper and a bridge rectifier, and a Zener diode, so it was like that by design, not faulty.) Caveat Emptor and all that.
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