Resettable Fuse with Quick Trip Time

[hakeen]

Hi

I search for a resettable kind of fuse with trip time less than 0.1ms. The current he can carry should be several tens of ampers (~30A) for very short time (few hundred usec). It seems PPTCs are rather too slow for such usage. Does anybody have any better idea?

Thanks for your help in advance.

Regards

 

[erikl]

Does anybody have any better idea?

What about an electronic "fuse" - an appropriate power supply with (pulsed) current fold back? See the pictures below. Sorry this is in German language; it stems from here.

 

[FvM]

A circuit powered by the electronic fuse may require some inrush current, e.g. to charge bypass capacitors. Personally I prefer
an electronic current limiter with a low voltage drop MOSFET, that limits the output current to a save level and a timer, that performs
a shutdown, if the overcurrent lasts for longer than a few ms to protect the transistor.