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.

[Linked Image from gfretwell.com]

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

Greg Fretwell