| 337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
| 14 | DF | ELECTROTHERMALLY ACTUATED SWITCHES {9} |
| 142 | DF | .~ Fusible element actuated {15} |
| 283 | DF | .~.~ Plural independent fuses {1} |
| 284 | DF | .~.~.~ Selectively or sequentially inserted in same protected circuit {2} |
| 285 | DF | .~.~.~.~ Automatic selective means (e.g., repeater type) {2} |
| 286 | DF | .~.~.~.~.~ With delayed action selective means {1} |
| 287 | | .~.~.~.~.~.~ Hydraulic or pneumatic |