ECN Forum Forums Thread Like Summary - Semiconductors as contactors

I have loved to use these during the last 25-30 years, and always owersized the ampacity, so did I here to. It was labeled 25A and the max load on the circuit was 9 amp. for several hours.
Nothing else than this and 2 cm of the cables was ruined, but now I will use a contactor (rated 25A) 🙂 More noice more power to energize and hopefully more safe. 🙂

Maybe not only for non US Electrical systems, but this is in Norway at 230V 50Hz

Attached Images

We have had SSRs for at least 40 years but I am not sure how many were making their way into general industrial use. The good ones came from ISO22 or Crydom. They usually died a quiet death, just not passing current. These white Asian SSRs seem to fail more catastrophically. I have had several blow up. I am not sure whether the SSR blew the motor cap or it was the other way but the SSRs have failed in a similar manner in other applications including resistance heaters.



These things do not qualify as a "disconnect". They are just used for circuit control.