Fotek SSR-40DD Teardown

I tear apart the SSR producing 4V voltage drop. Removed most of the rubber and plastic crap inside.
Here is the result:

 

The key components:

• Motorola H11D1 optocoupler
• NEC 2SA1009 BJT (This is mostly an assumption, because it only have a A1009 sign on it)
• ST BUF420A BJT

A silent note: using a 30A BJT in a 40A rated equipment maybe not a good idea.