US PATENT SUBCLASS 218 / 87
.~.~ Magnetic synchronous contacts

Current as of: June, 1999
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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}
87.~.~ Magnetic synchronous contacts

DEFINITION

Classification: 218/87

Magnetic synchronous contacts:

(under subclass 43) Subject matter including secondary contacts which operate by electrodynamic drive means controlled by a zero-current after the opening of the main contacts.