(under subclass 6) Subject matter wherein the interrupting device structure includes auxiliary contacts or other significant means whereby an electrical shunt circuit is established to bypass either the main circuit contacts or the operating coil of the device, prior to the opening or closing of the main contacts, thereby preventing arcing and damage to either the main contacts or the operating coil.
SEE OR SEARCH THIS CLASS, SUBCLASS:
156, for electromagnetically actuated switches combined with protective means.
201, for magnetic switches with arc prevention means.
236+, for electromagnetic relays with a shunt path for the magnetic flux.
SEE OR SEARCH CLASS 218, High-Voltage Switches With Arc Preventing and Extinguishing Devices,
1+, for nonmagnetically controlled switches with arc prevention means.
307, Electrical Transmission or Interconnection Systems,
134+, for switching systems with arc prevention or other switch contact operation facilitating means.
337, Electricity: Electrothermally or Thermally Actuated Switches,
15+, for electrothermally actuated shunt circuit completion devices.
361, Electricity: Electrical Systems and Devices,
1+, for protective devices with arc prevention, subclasses 54+ and 58 for electromagnetic device protection circuits with shunting or impedance insertion means.
