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It is a silicon-controlled rectifier, converting AC to DC for use in drawworks, mud pumps, etc.:silicon-controlled-rectifier
Because it is controlled by the gate current
silicon controlled rectifier is a 3 terminal 4 layer device which has 2 consecutive P N junctions here the three terminals called anode, cathode and gate gate controls the conduction of the scr but diode just conducts in forward bias and blocks in reverse bias
A silicon controlled rectifier falls into this category.
For the same reason that its used in transistors and resistors...Its a semiconductor.