Power Electronics
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then

 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
 Vc1 > Vc2 > Vc3 when Ig1= Ig2
 Vc1 = Vc2 = Vc3 any value of Ig.
  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.

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Power Electronics
In reverse 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 J1 and J2 is in forward bias and J3 is in reverse bias.
 junction J3 is in forward bias and J1, J2 in reverse bias.

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