| 337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
| 14 | DF | ELECTROTHERMALLY ACTUATED SWITCHES {9} |
| 142 | DF | .~ Fusible element actuated {15} |
| 222 | ![]() | .~.~ With switch protective means (for fuse structure) {2} |
| 223 | DF | .~.~.~> Against shock or recoil |
| 224 | DF | .~.~.~> Against corona (e.g., shield) |