| 337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
| 298 | DF | THERMALLY ACTUATED SWITCHES {7} |
| 401 | DF | .~ With fusible, combustible or explosive material {5} |
| 402 | ![]() | .~.~ With manual, gravity-actuated or other mechanical contact control means {4} |
| 403 | DF | .~.~.~> Automatic cutout or disconnect type {2} |
| 406 | DF | .~.~.~> Multiple contacts or plural circuit control means |
| 407 | DF | .~.~.~> Utilizing spring or other energy {2} |
| 411 | DF | .~.~.~> Latch, trip or holding means |