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SSR Protection

by hebign Mar 11, 2019
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That SSR might be a concern. In my custom build I discarded that exact SSR (which came with a heated bed) because of safety concerns.
There are several youtube videos that document the risk. Some of those SRR's just ignite, others have 1/2 the listed rating, and some are hot rather than grounded.

I am using instead a Sensata-Crydom CWD245 with a huge heat sink and a fan. $47 for the SRR and $15 for the heat sink is cheap insurance vs a house fire.

Also, The power supply case should be tested with an ohm meter for ground continuity and resistance


thank you for this return but this kind of ssr does not heat absolutely, so I really do not see the point of adding a sink, especially at $ 15 while on aliexpress there are much cheaper ...
Regarding the quality of the model that I present and that I use ... I never had a negative return and I know that it is very used. So, maybe you're right but a fuse and a good grounding, it should do, after I'm not a specialist in this area ...

If you are selling these units can you be sued? Do you have liability insurance? NO and NO will be the answer.

There is a reason I buy UL listed items from digikey that are sourced from American, Japanese, or European companies. SAFETY. Beyond safety if its not UL listed (and many Chinese products have fake stamps) you might not get paid from your insurance company when/if it burns down).

I am not your parent. If you want to play Russian roulette with your life go ahead.

$67 might be a quarter the cost of a Chinese printer. Anets and Tevo's have fire issues as well. A good power supply might cost another $60 (which mine does) because its grounded. The whole printer frame has been tested to ground. The connectors I use are UL rated and have spec sheets to voltage and amperage.

Fotek SSR dangers

Spectacular SSR Failure (Fire)

Big Clive Tear Down (unit not rated to amperage)

Load always on during failure (when wired to wrong polarity)

Hard Short to Ground (very dangerous)