| 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} |