# US 8,785,797 B2 · Medium voltage circuit breaker > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,797 B2 - Document ID: US8785797B2 - Status: Granted - Kind: B2 - Application number: 12/973,383 - Filed: 2010-12-20 - Published: 2011-06-30 - Granted: 2014-07-22 - Earliest claimed: 2009-12-29 - Assignees: ABB Technology AG - Applicants: Gianluca Cortinovis; Giorgio Moriconi - Inventors: Gianluca Cortinovis; Giorgio Moriconi - Web page: https://patentgrep.com/patent/US8785797B2 ## CPC - H01H 33/666: Operating arrangements - H01H 33/42: Driving mechanisms - H01H 33/904: {characterised by the transmission between operating mechanism and piston or movable contact} - H01H 71/04: Means for indicating condition of the switching device {(by means of an auxiliary contact H01H71/46)} - H01H 2033/6667: {Details concerning lever type driving rod arrangements} - H01H 2071/046: {exclusively by position of operating part, e.g. with additional labels or marks but no other movable indicators} - 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 A Medium Voltage circuit breaker which comprises a pole assembly having, for each phase, a first fixed contact and a second movable contact reciprocally couplable/uncouplable between an open and close position. The circuit breaker further comprises an actuator to actuate the opening and closing operation of said circuit breaker, and a kinematic chain operatively connecting said actuator to said movable contact. The kinematic chain comprises a sliding element operatively connected to said actuator, said sliding element having a first sliding surface operatively coupled to said movable contact and being movable between a first, open, position and a second, closed, position. ## Claims ### Claim 1 A medium voltage circuit breaker comprising a pole assembly having, for each phase, a first fixed contact and a second movable contact reciprocally couplable/uncouplable between an open and close position, an actuator to actuate an opening and closing operation of said circuit breaker, and a kinematic chain operatively connecting said actuator to said movable contact, said kinematic chain comprising a sliding element operatively connected to said actuator and which is linearly movable by said actuator, said sliding element having a first sliding surface operatively coupled to said movable contact and a second sliding surface, which is opposite to said first sliding surface; wherein said sliding element moves without rotating around the connection point with said actuator; wherein said first sliding surface is coupled to a second roller that is connected to said movable contact and said second sliding surface is operatively coupled to a first roller that is mounted on a fixed part of the circuit breaker; wherein said first sliding element is movable between an open position and closed position; wherein a profile of said first sliding surface is not flat and is shaped so that the profile of said first sliding surface has at least a first and a second segment having different slopes; wherein the profile of said second sliding surface is flat and straight for the entire length of said second sliding surface; wherein said second roller and said movable contact are linearly movable along a same second direction of movement that is perpendicular to the first direction of movement of said sliding element; wherein said first roller is in a fixed position with respect to said sliding element to support said sliding element. ### Claim 2 (depends on 1) The medium voltage circuit breaker according to claim 1, wherein said sliding element is movable in a first direction and said second movable contact is movable in a second direction transverse to said first direction. ### Claim 3 (depends on 1) The medium voltage circuit breaker according to claim 1, wherein that said sliding element is hinged on a first lever operatively connected to said actuator. ### Claim 4 (depends on 1) The medium voltage circuit breaker according claim 1, wherein said sliding element comprises the second sliding surface operatively coupled to the first roller. ### Claim 5 (depends on 1) The medium voltage circuit breaker according to claim 1, wherein said first sliding surface is operatively coupled to the second roller connected to said movable contact. ### Claim 6 (depends on 1) The medium voltage circuit breaker according to claim 1, wherein the profile of said first sliding surface is shaped so as to provide a variable speed of said movable contact during said opening and closing operation of said circuit breaker. ### Claim 7 (depends on 1) The medium voltage circuit breaker according to claim 1, wherein said sliding element is made of insulating material. ### Claim 8 (depends on 1) The medium voltage circuit breaker according to claim 1, further comprising a control device that checks the position of the contacts and drives a corresponding interlock device, said control device being operatively positioned on said sliding element. ### Claim 9 (depends on 2) The medium voltage circuit breaker according to claim 2, wherein that said sliding element is hinged on a first lever operatively connected to said actuator. ### Claim 10 (depends on 2) The medium voltage circuit breaker according to claim 2, wherein said sliding element comprises a second sliding surface operatively coupled to the first roller. ### Claim 11 (depends on 3) The medium voltage circuit breaker according to claim 3, wherein said sliding element comprises the second sliding surface operatively coupled to the first roller. ### Claim 12 (depends on 2) The medium voltage circuit breaker according to claim 2, wherein said first sliding surface is operatively coupled to the second roller connected to said movable contact. ### Claim 13 (depends on 3) The medium voltage circuit breaker according to claim 3, wherein said first sliding surface is operatively coupled to the second roller connected to said movable contact.