Electronics > Projects, Designs, and Technical Stuff
How safe is it to use a SSR to control power to a spa? Or use a relay?
DougSpindler:
--- Quote from: langwadt on July 19, 2020, 08:11:18 pm ---
--- Quote from: DougSpindler on July 19, 2020, 07:54:33 pm ---
--- Quote from: Gyro on July 19, 2020, 07:45:25 pm ---
--- Quote from: DougSpindler on July 19, 2020, 07:11:56 pm ---
--- Quote from: Gyro on July 19, 2020, 06:58:19 pm ---It tends to be easier to obtain UL approved high current mechanical relays with decent insulation and contact ratings than SSRs. You'll probably have more choice.
An SSR will have a higher thermal dissipation than a relay too.
EDIT: For something high power like a hot-tub, you're probably looking at a 'contactor' rather than a relay too.
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So just go with a contactor/relay? Looking on Amazon i'm finding 30a contactor/relay's for $10.
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Well personally I wouldn't go to Amazon for a guaranteed genuine UL approved contactor these days, I'd use an electrical / electronics distributor, but yes.
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What difference doest it make where you BUY a product? Shouldn't you really be concered about the product itself and not who sold it?
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the chances of actually getting an UL approved contactor that meets specification at electrical/electronics distributor is vastly higher
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Are you sure? Look at all of the "fake" immolation Chinese products that are out there where expert's can't even tell the difference. An electronics distributor is just going to resell what they were sent. Who knows for sure if the item meets specs or not?
Gyro:
Because they have a fully documented suppy trail from the manufacturer. Amazon is just like all the other 'international marketplaces' these days, with the same cautions.
I wouldn't expect to get a genuine semiconductor from Amazon any more than a China seller on ebay for instance. The same applies to other [Edit: much more easily faked] parts.
bdunham7:
--- Quote from: DougSpindler on July 19, 2020, 08:16:11 pm ---Are you sure? Look at all of the "fake" immolation Chinese products that are out there where expert's can't even tell the difference. An electronics distributor is just going to resell what they were sent. Who knows for sure if the item meets specs or not?
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That's not really true. Experts usually CAN tell the difference and reputable distributors use appropriate supply chain practices to avoid counterfeits. It still can happen, but getting a fake brand-name contactor from Grainger or even Home Depot is a lot less likely than getting a fake from Lonely Baby Garden Store on AliExpress. And a NOS unit in a worn box from some eBay seller is also very unlikely to be fake.
DougSpindler:
--- Quote from: Gyro on July 19, 2020, 08:20:38 pm ---Because they have a documented suppy trail from the manufacturer. Amazon is just like all the other 'international marketplaces' these days, with the same cautions.
I wouldn't expect to get a genuine semiconductor from Amazon any more than a China seller on ebay for instance. The same applies to other parts.
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Take a look at the fake Cisco products that are on the market. Or the fake chips. Not sure a suppler could even spot the difference.
Gyro:
You're in the US - Just buy it from Digikey or Mouser, it's not difficult! ::)
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