Tefal SW3703 Toaster Tripping 40A Fuse - Grounding Issue?

Hello,

I have a little problem. When the Tefal SW3703 toaster is connected to the power supply in the apartment, the main 40A automatic fuse blows.
But maybe in order:
The first time it was turned on, the toaster worked for about a few dozen seconds, then the fuse blew. After that, each plugging into the socket ended with the cork popping out. After a few tries, the toaster caught on again and was heating up. It worked until I pulled the plug out of the socket - at the time of pulling the plug out the fuse blew. I tried several outlets in the kitchen and each time had the same problem.
I got the idea that maybe something is wrong with the grounding cable in the plug of the toaster. So I found an extension cord that doesn't have grounding pins and the problem disappeared. The toaster heats up normally, the corks do not fall out, regardless of whether I insert or remove the plug from the socket.

The conclusion is that the fault is somewhere in the ground circuit (if I express myself correctly). What could be causing this?
If I am not able to fix this fault myself and I want to use the toaster by connecting it to an extension cord "without pins", what is the risk of electric shock in the event of a breakdown? The housing is rather plastic, but the heating inserts (for toast, grill) are of course metal.

I am waiting for diagnosis...

I will add that other electrical devices (electric kettle 2000W, microwave 850W) work without any problems. Sorry for the new post but I had trouble editing.

I will be grateful for any tips.

From what you've written, it sounds like your circuit breaker is tripping. This is certainly caused by the leakage of the main current into the protective conductor. If the device has a protective contact in the plug, it should not be used without a protective conductor for safety reasons!

Hello.
Spin it up. Maybe you will find the fault yourself, i.e. you probably have a short-circuit of the neutral wire to ground.
Try to attach it as you wrote to the extension cord without a pin and check with a screwdriver with a neon lamp on the housing - metal - will it light up, if not, turn the plug 180 degrees, insert it into the extension cord and check again the neon lamp will light up.
If it is not lit, there is definitely a short circuit of the neutral wire to ground, and if it is lit, you know the phase on the ground - an electric shock will definitely happen someday.

Hello,

I have a moulinex 6030 toaster, which I unscrewed and it turned out that there was a short circuit of the cables: blue and dark brown. I also noticed that the diode from this cable is milky (burnt?). Generally the toaster is dead. Anyone have an idea?