323 / | HD | ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS |
|
318 | DF | EXTERNAL OR OPERATOR CONTROLLED {5} |
320 | | .~ Phase controlled switching using electronic tube or a three or more terminal semiconductive device {6} |
321 | DF | .~.~> With soft start |
322 | DF | .~.~> With digital control |
323 | DF | .~.~> With interval timer |
324 | DF | .~.~> Using single unidirectional element with bidirectional pass |
325 | DF | .~.~> With a three or more terminal semiconductive device in trigger circuit {1} |
327 | DF | .~.~> With passive element only in trigger circuit |