337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
14 | DF | ELECTROTHERMALLY ACTUATED SWITCHES {9} |
142 | DF | .~ Fusible element actuated {15} |
283 | .~.~ Plural independent fuses {1} | |
284 | DF | .~.~.~> Selectively or sequentially inserted in same protected circuit {2} |