337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
298 | DF | THERMALLY ACTUATED SWITCHES {7} |
401 | DF | .~ With fusible, combustible or explosive material {5} |
402 | DF | .~.~ With manual, gravity-actuated or other mechanical contact control means {4} |
406 | .~.~.~ Multiple contacts or plural circuit control means |