Thyristor is a semi controlled rectifier because when ever a positive voltage is applied at anode and negative voltage is applied at cathode,the thyristor goes in to forward blocking mode at this mode we can control the thyristor by using gate.
All power transistors and GTO are fully controlled rectifiers. but in the next case when ever a positive voltage is applied at cathode and negative voltage is applied at anode the thyristor goes in to reverse blocking mode,in this mode we can not apply the gate,otherwise the gate is applied the thyristor comes into thermal runaway,after some time the thyristor burned.Due to this thyristor is controlled only in one mode by using gate,according to this type of operation thyristor is called semi controlled rectifier.
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