Any type B RCD will use electronics to condition, amplify and threshold the signal from the Hall sensor or Flux gate. They may or may not also use software, I suspect flux gate designs are more likely to be software based given they also have to generate excitation for the sensor. Safety-critical electronics and software is entirely possible, it's just expensive due to the level of verification and test needed, especially software where the number of possible states is vast.
Many "ordinary" RCDs and RCBOs (AC/A) also contain at least some electronics, because it's cheaper to add some gain to drive a big, crude tripping mechanism than it is to manufacture a sensitive, finely-balanced mechanism as needed for an all-electromagnetic design. This is quite possibly a more reliable approach as well, as the whole mechanism can be more robust and less affected by minor corrosion, etc.
Any type B RCD will use electronics to condition, amplify and threshold the signal from the Hall sensor or Flux gate. They may or may not also use software, I suspect flux gate designs are more likely to be software based given they also have to generate excitation for the sensor. Safety-critical electronics and software is entirely possible, it's just expensive due to the level of verification and test needed, especially software where the number of possible states is vast.
Many "ordinary" RCDs and RCBOs (AC/A) also contain at least some electronics, because it's cheaper to add some gain to drive a big, crude tripping mechanism than it is to manufacture a sensitive, finely-balanced mechanism as needed for an all-electromagnetic design. This is quite possibly a more reliable approach as well, as the whole mechanism can be more robust and less affected by minor corrosion, etc.
