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The diagram you link is ineffective - an indirect lightning strike bounces the local earth and, the whole earth system of the building follows that bounce (or surge). Usually (and provided there is on …

Not really - it all depends on the state your battery was in at the time. If the battery had been previously discharged to some degree then plugged in, it is likely that the laptop will exhibit a diff …

Try setting LTSpice as follows: - The bit that is important is setting the skipping of the initial point solution. Image from here.

It’s likely a negative temperature coefficient device used to limit inrush current into the bulk storage capacitor and prevent fuses blowing or breakers tripping. It’s quite a common thing to implemen …

This didn’t fix the issue. Is a varistor with a crack in the case a sign that it’s also toast? It's not a good sign and it may well be broken but, given that both varistors mentioned are across the …

A few pointers: - The surge generator will have a defined output resistance that is stated in the specification of the surge you are trying to meet. This output resistance may be enough to avoid addi …

The LTC4380 is a surge stopper that clamps the output voltage to a predetermined value The output voltage is not technically clamped; the output voltage is "limited" or, maintained surge-free by lin …

It's called inrush current limiting and works by allowing the capacitors to charge to close to their peak voltage value via the 10 ohm resistor. This limits inrush current when the capacitors are full …

I'm not sure you are comparing apples with apples on this. The RS485 device is undoubtedly more powerful and clamps to a lower voltage than the USB device: - SM712 clamp voltage at 5A = +20V and -10 …

How do I select the MOV for a multiple operating voltages. What actually are you trying to protect? What are you trying to protect against? I wish to prevent high voltage being applied on input sid …

What does the Impulse Sparkover at 100 V/us and 1000 V/us mean? What it tells you is that if you applied a fast rising surge changing at a rate of 100 volts per microsecond then the GDT would spa …

If I'm working on a battery powered device that has no connection to ground, is it still necessary to guard against voltage spikes? Any spike or surge does not respect a non-galvanically earthed sys …

So what am I missing? How can a transformer protect against high voltage surges from the outside? That is not how lightning generally inflicts itself on telecom cables (for instance). Typically …

Is surge protection for analogue signals different from binary signals Weidmuller refer to open and closing signalling contacts as binary signals and protecting these may indeed be very different …

Since this is indirect lightning and has a fast waveform, should the tvs diode be slightly above the Impulse Sparkover voltage? If the TVS breakdown voltage was above the GDTs impulse sparkover …