having auxiliary control electrode to which blocking control voltages or currents are applied in case of emergency

Full Title

Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions > for converters; for rectifiers > for static converters or rectifiers > for rectifiers > having auxiliary control electrode to which blocking control voltages or currents are applied in case of emergency