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) |