Portable 120V to 240V Converter; or How to Fast Charge at Your In-Law’s House | Lrd12 Overload Relay

Heater might be pulling 22 A when hot, but on power up … likely much more. Think about incandescent lightbulb or electric motor, for example.

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Over and over again, I have heard HVACR technicians and electricians quote rules of thumb regarding wiring sizing, and I have witnessed and participated in many heated debates on the topic.

If the device does not have it owns fuse/breaker and relies on the upstream one, it had better be able to handle the full rated current without catching fire.

Everything else on the datasheet are useless observations only true under test conditions. A few really awesome datasheets give junction to ambient, which is a blessing if you don’t need a heatsink.

Yes, I get that there are societal differences between Eastern ideals and Western ideals. Please understand that Americans also build cheap crap, too- but being across an ocean makes buying and selling a little different, especially with a language barrier and different societal norms. I’ve been bitten by a couple of misrepresented products before on AliExpress, (RGB mechanical switches that were actually just RGB LED’s), but that was my fault- I didn’t look very carefully, and didn’t do my due diligence.

I had three electrocutions with mains voltage in about one hour. It was a dark and stormy night, when I decided to try again building my own half-bridge SMPS which had tendency to explode whenever I plugged it in. It was made of two boards: one contained EMI filters, bridge, fuse and HV electrolytic capacitors, other had high-side controller, transistors, transformer and everything else. When another transistor decided that it would rather choose new Pope instead of working, I got a bit angry. I grabbed something to drink in kitchen, returned and grabbed the board in order to smash it against the wall. I forgot to unplug it first. Ouch. Half a hour later, it was still dark and stormy night, I attempted to fix an ATX supply. When I was grabbing something from behind of supply, I touched the board with my forearm. Supply was plugged, of course. Ouch. Half a hour later, yes, it was a dark and annoying night, I was still working on the ATX supply. I unplugged the supply and was inspecting the traces, my nose and lower lip brushed solder pads of those two big caps that were charged to ~320V. I went to bed with my face hurting…

The contacts therefore return to their normally closed position by spring power as the motor coasts to a stop.

Invensys Triconex: 冗余容错控制系统、基于三重模件冗余（TMR）结构的最现代化的容错控制器。

And in my own experience, I have seen switch mode power supplies designed for 400 volts DC (280 volt AC), taking clearance for such into consideration throughout the whole design.

If you’re buying electricty at 15 cents per kWh, then it’ll cost you .15 * 10.5 = $1.58 to fully charge the Niro’s battery, which will propel the car 26 miles, at which point the gasoline engine kicks in, which gets 46 mpg.

DC burns. It doesn’t cause a muscle lock-up like AC does. It’s more dangerous in that sense, because you don’t feel it beyond the initial shock until your flesh starts to cook from inside out.