# US 4,392,035 A · Vacuum interrupter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,392,035 A - Document ID: US4392035A - Status: Granted - Kind: A - Application number: 06/270,056 - Filed: 1981-06-03 - Granted: 1983-07-05 - Earliest claimed: 1981-06-03 - Assignees: General Electric Company - Inventors: Gerhard Frind; James J. Carroll; John H. Van Noy - Web page: https://patentgrep.com/patent/US4392035A ## CPC - H01H 33/6641: {making use of a separate coil} - H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00) ## Abstract Improvement of the peak current interruption performance of a vacuum interrupter is obtained by configuring the conductive leads to the vacuum interrupter in a manner whereby the magnetic field generated by current in the conductive leads and impinging upon the space between a pair of contacts of the vacuum interrupter is minimized, thereby resulting in better performance of the vacuum interrupter. ## Claims ### Claim 1 An improved vacuum interrupter, comprising: (a) an evacuated vessel having a generally cylindrical conductive sidewall; (b) first and second generally disc-shaped contacts disposed within said conductive vessel, and spaced inwardly from said conductive sidewall by at least a first predetermined distance, said contacts being substantially aligned with each other along a contact axis, and defining a mating interface when abutting each other; (c) first conductor means projecting externally of said vessel and being connected to said first contact; (d) second conductor means projecting externally of said vessel and being connected to said second contact; (e) third conductor means connected to said first conductor means at a second predetermined distance from said mating interface on a first side of said mating interface, said distance being measured in a direction parallel to said contact axis; and (f) fourth conductor means connected to said third conductor means, said fourth conductor means being disposed substantially concentrically and symmetrically about said contact axis, said fourth conductor means running from a third predetermined distance from said mating interface on said first side thereof to a fourth predetermined distance from said mating interface on a second side of said mating interface, and spaced between fifth and sixth predetermined distances from said contact axis said third and fourth distances being measured in a direction parallel to said contact axis and said fifth and sixth dimensions being measured in a direction perpendicular to said contact axis, said second and fourth conductor means being parallel to each other for a finite extent and said fourth conductor means being oriented so as to carry current in a direction substantially parallel to said contact axis. ### Claim 2 (depends on 1) The invention of claim 1 wherein said second conductor means comprises a generally linear and rod-like conductor and extends a seventh predetermined distance from said mating interface on said second side thereof said seventh predetermined distance being measured in a direction parallel to said contact axis. ### Claim 3 (depends on 1) The invention of claim 1 wherein said first and second contacts each comprises a plurality of finger portions spiralling from a lesser radius of said respective contact to a greater radius of said respective contact, said respective finger portions spiralling in opposite rotational directions as viewed from said mating interface. ### Claim 4 (depends on 3) The invention of claim 3 wherein said respective pluralities of finger portions of said first and second contacts each comprises four finger portions, each of said four finger portions having a generally linear portion disposed at the peripheral edge of said respective contact, each being oriented substantially tangentially to said respective contact, and each having a length of approximately one-half the diameter of said respective contact. ### Claim 5 (depends on 1, 3) The invention of claim 1 or 3 wherein said first predetermined distance is between about 0.5 and 1.5 inches. ### Claim 6 (depends on 5) The invention of claim 5 wherein said first predetermined distance is about 1.5 inches. ### Claim 7 (depends on 3) The invention of claim 3 wherein said third predetermined distance is between approximately 2 and 6 times the diameter of said first contact. ### Claim 8 (depends on 7) The invention of claim 7 wherein said fourth predetermined distance is between approximately 2 and 6 times the diameter of said first contact. ### Claim 9 (depends on 8) The invention of claim 8 wherein said second predetermined distance is between approximately 2 and 6 times the diameter of said first contact. ### Claim 10 (depends on 8) The invention of claim 8 wherein said fifth and sixth predetermined distances, respectively, are approximately 2 and 6 times the diameter of said first contact. ### Claim 11 (depends on 2) The invention of claim 2 wherein said seventh predetermined distance is between approximately 2 and 6 times the diameter of said first contact. ### Claim 12 (depends on 1) The invention of claim 1 wherein said third conductor means is disposed substantially concentrically and symmetrically about said contact axis. ### Claim 13 (depends on 1) The invention of claim 1 wherein said fourth conductor means comprises a plurality of conductors spaced substantially symmetrically about said contact axis. ### Claim 14 (depends on 13) The invention of claim 13 wherein said third conductor means comprises a plurality of conductors equal in number to said plurality of conductors of said fourth conductor means and which are respectively connected to said conductors of said fourth conductor means. ### Claim 15 (depends on 14) The invention of claim 14 wherein said plurality of conductors of said fourth conductor means comprises four conductors. ### Claim 16 (depends on 1) The invention of claim 1 wherein said fourth conductor means comprises a solitary conductor whereby it continuously circumscribes said contact axis. ### Claim 17 (depends on 16) The invention of claim 16 wherein said fourth conductor means is generally cylindrical in shape. ### Claim 18 (depends on 16) The invention of claim 16 wherein said fourth conductor means is substantially cylindrical in shape. ### Claim 19 (depends on 16) The invention of claim 16 wherein said third conductor means comprises a substantially flat, substantially circular plate connected to said first conductor means at approximately the center of said plate and connected to said fourth conductor means at the perimeter of said plate. ### Claim 20 (depends on 1) The invention of claim 1 wherein all portions of said fourth conductor means are spaced from said contact axis by a substantially uniform radial distance. ### Claim 21 (depends on 2) The invention of claim 2 further comprising a fifth conductor means, said fifth conductor means being connected to said second conductor means at said seventh predetermined distance from said mating interface on said second side thereof, being disposed substantially concentrically and symmetrically about said contct axis, and having a portion disposed in proximity to said fourth conductor means. ### Claim 22 (depends on 21) The invention of claim 21 wherein said fifth conductor means comprises a plurality of conductors.