218 / | HD | HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES |
1 | DF | ARC PREVENTING OR EXTINGUISHING DEVICES {14} |
43 | DF | .~ Air-current blowout {18} |
68 | DF | .~.~ Sealed chamber {10} |
69 | DF | .~.~.~ Plural switch connected in series {1} |
70 | .~.~.~.~ Hybrid-type |