From: tnp@invalid.invalid   
      
   On 26/08/2025 10:54, Jeff Jonas wrote:   
   >> The relays are switching DC at 12V, but the polarity is determined   
   >> before the on/off relay. Most SS relays I've seen are triac-based for AC   
   >> only; one type would do DC, but not with the polarity changing (and at   
   >> 10x the cost anyway!).   
   >   
   > MOSFET based solid state relays   
   > handle DC or AC and shut off immediately   
   Can do. Most MOSFETS are unipolar   
      
   > whereas SCR or TRIAC turn off AC only at the zero crossing.   
   >   
   Look up GTO thyristors   
      
   > see:   
   > https://www.ti.com/document-viewer/lit/html/SSZTB27   
   >   
      
   --   
   You can get much farther with a kind word and a gun than you can with a   
   kind word alone.   
      
   Al Capone   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)