Graphcore’s new AI chips are the best-looking server processors you’ll never see | 25 Amp Circuit Breaker

The UMC equipment included with the Model 3 LR can supply up to 32 amps. That’ll charge at a bit over 30 miles an hour.

Being small and shiny, it was an almost dead cert that a new engineer would pick it up, When tipped over, the relay would be energized by the tilt switch, the relay then switched off its own power, which resulted the contacts closing again, resulting in oscillation, and large back emf spikes which were presented across the two metal plates. As a result the person who picked up the box got a fairly significant belt, and let out some major expletives.

Five vs Ten amps is a big difference in heating in the power factor correction circuit of his power supply. If you find a data sheet for similar power supplies, they are always 1-3% more efficient on 220Vac and run cooler because of it.

I also seen a technique where a relay is placed in parallel with the zero crossing triac so the triac is only passing the load for 200ms or so while the relay switches. Since the triac is on longer than the relay, the contacts don’t arc over when switching, and the traic doesn’t pass the current all the time.

We recently had a chat among the Hackaday writers about how we could approach this subject. The easy way out is to be all Elf-and-Safety and join the radioactive anthrax crowd. But the conclusion we came to was that this site is a resource for hackers and makers. Some of you are going to lift the lid on boxes containing significant voltages no matter what, so we thought we’d help you do it safely rather than just listen for the distant screams.

Low voltage DC distribution makes sense in some cases. 12V is pretty low, though: copper losses are still high, so the amount of copper required is expensive for house-scale. 48V uses one sixteenth the amount of copper, and still is below the shock hazard limit. 48V rack systems are mature, common and are a great idea.

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.

The farther I need to travel to get to you, the more time is taken out of my day—and I’ll factor that into your bill. Finding someone closer to your neighborhood might be able to charge you less.

This Kia Niro’s cargo area, in contrast, looks very nice! Interesting. Kia’s brand equity isn’t strongly convincing as a sound long-term value-driven purchase. I haven’t driven one, but it sounds like it isn’t great to drive.

It was only after more than four years of several multiday outages every winter that attorney Rebecca Neale and her husband, Thom, had an electrician install a manual transfer switch at their Bedford, Mass., home, and ponied up for a portable generator. Now they use it to provide power to the furnace, refrigerator, sump pump and select electrical outlets. “I waited so long because I’m cheap,” Neale admits. “But, I was tired of our lives being interrupted or worrying the pipes would freeze. I kick myself for not getting one sooner.”

We were pretty close to that 40% rule when our controllers started to fail, which is probably why they only started failing after our customers had use the controllers a few times. We were pushing 22 Amps through 40 Amp rated parts. In other words, using a component at half its rating still won’t cover for substandard parts! Our solution was to find a part that was manufactured to spec and also use the component at half its rating and we’ve not had a verified SSR related failure since.

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