So inside the enclosure, the 24V DC power supply is powered by the 230V AC through the power entry module. And this 24V DC power supply will be used to supply/source 3A current to a 8 Ohm load which is a heater. The power entry module for the AC mains side needs fuses to be installed across both line and the neutral.
The cord on the 250v one is probably made of identical material as the 125v one. It would cost a company more money to make cables with different voltage ratings than it would be to just make all of them rated for 250v. You even see this with are normal building wire, which has a voltage rating of 600v. The 4 voltages youre most likely to see
The Square D by Schneider Electric Homeline 20 Amp Two-Pole Circuit Breaker is used for overload and short-circuit protection of your electrical system. This breaker is compatible with Homeline load centers and CSED devices. The ANSI-certified and UL-listed unit is rated for 120/240 VAC and 10,000 AIR. Homeline circuit breakers are built with

Step 2. Disconnect the old 110-volt receptacle, if there is one. Remove the outlet cover, unscrew the receptacle from the electrical box and disconnect the wires by loosening the screws with a screwdriver. If the wires are inserted into holes behind the screws, snip them with wire cutters. Strip ½-inch off the ends of the black and white wires

The voltage rating of a glass fuse is the maximum voltage that it can safely interrupt. Using a 125V fuse instead of a 250V one would increase the risk of fire or explosion. A 250V fuse is also a better choice for your home appliance. Before you replace your fuse, you should find out whether it is a 250V or 125V type.
P = V x V/R. R = V x V/P = 230V x 230V / 1800W = 29.39 ohms. P = VI. P = V x V / R = 240V x 240V / 29.39 ohms = 1960W. so an 1800W element at 230V will provide 1960W at 240V, which is so close to 2000W as to make absolutely no difference. Besides, no one has 240V at home all the time.
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can i use 250v in 230v