ive never ever seen one fail open ckt? I suppose if no fuse is used it will melt down eventually into an open, but youll be to busy putting out the flames to notice.
folks always use a fuse on the hot lead of any DIY mains connected gear.
It's not whether it's a requirement or not. It's about whether the diode will survive longer than the fuse.
If the DN fails to open while the Fault current is passing, then the Live Fault remains on the equipment until the fuse opens.
How will the fuse open if the route for the Fault Current has been broken?
That is until someone touches the now faulty equipment and their hand/body "earths" the live part and closes the current exit route. The fuse now blows just as your body gets flung across the room!
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