Power Electronics
SCR will be turned off when anode current is

 < latching current but greater than holding current and gate signal is present.
 less than holding current.
  < latching current but greater than holding current and gate signal is 0.
  both (A) and (B).

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Power Electronics
In forward blocking mode of a thyristor

  junction J2 is in reverse bias and J1, J3 is in forward bias.
  Junction J1, J3 is in reverse bias and J2 is in forward bias.
  junction J3 is in forward bias and J1, J2 is in reverse bias.
  Junction J1 and J2 is in forward bias and J3 is in reverse bias.

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