1411. In the illustrated solid-state «soft» starter for a three phase induction motor as shown in figure «A», what is the name of the devices that are controlled by the gate control circuits

Thyristors are controlled by gate circuits in a solid-state soft starter to regulate motor voltage by adjusting the firing angle. These devices handle high-power AC line currents and feature gate terminals for control, unlike diodes, Zener diodes, or varactors which lack this functionality and are unsuitable for this application.