# US 10,770,248 B2 · Molded case circuit breaker > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,248 B2 - Document ID: US10770248B2 - Status: Granted - Kind: B2 - Application number: 16/286,925 - Filed: 2019-02-27 - Published: 2019-11-14 - Granted: 2020-09-08 - Earliest claimed: 2018-05-11 - Assignees: Lsis Co., Ltd. - Applicants: Lsis Co., Ltd. - Inventors: Kihwan Oh; Kyunghwan Oh - Web page: https://patentgrep.com/patent/US10770248B2 ## CPC - H01H 9/32: Insulating body insertable between contacts - H01H 33/06: Insulating body insertable between contacts - H01H 1/2058: {Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker} - H01H 33/53: Cases (for switchgear H02B1/26); Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices - H01H 73/045: {Bridging contacts} - H01H 73/18: Means for extinguishing or suppressing arc {(magnet coil acting as blow-out device H01H71/38)} - 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 The present disclosure relates to a molded case circuit breaker, and more particularly, to a contact unit of a molded case circuit breaker. A molded case circuit breaker according to an embodiment of the present disclosure may include a fixed contact; a movable contact rotatably provided on a shaft body to be brought into contact with or separated from the fixed contact; and an insulating barrier that enters between the fixed contact and the movable contact during interruption, wherein the insulating barrier is coupled to the movable contact to rotate along a circumferential surface of a shaft body. ## Claims ### Claim 1 A molded case circuit breaker, comprising: a fixed contact; a movable contact configured to be brought into contact with or separated from the fixed contact; an insulating barrier configured to enter between the fixed contact and the movable contact during interruption, wherein the insulating barrier comprises a free end portion and is formed of a flexible material, and a guide portion protruded on part of a base mold and configured to guide the free end portion of the insulating barrier, wherein the insulating barrier is coupled to the movable contact to rotate along a circumferential surface of a shaft body, wherein the guide portion comprises a pair of protrusion portions spaced apart from each other, wherein when an external force does not act on the insulating barrier, the insulating barrier is configured to maintain a shape of surrounding the circumferential surface of the shaft body, and be bent by being brought into contact with the guide portion, and wherein when the movable contact is connected to the fixed contact, the free end portion of the insulating barrier is configured to be lifted up from the shaft body by the guide portion. ### Claim 2 (depends on 1) The molded case circuit breaker of claim 1, wherein a fitting groove is formed on a rear surface of the movable contact, and one end portion of the insulating barrier is fitted and coupled to the fitting groove by a fixing pin. ### Claim 3 (depends on 1) The molded case circuit breaker of claim 1, wherein a circumferential groove-shaped plate groove is formed on the shaft body, and a contact plate sliding along the plate groove is provided in the plate groove. ### Claim 4 (depends on 3) The molded case circuit breaker of claim 3, wherein the plate groove is formed smaller than a radius of the circumferential surface of the shaft body. ### Claim 5 (depends on 3) The molded case circuit breaker of claim 3, wherein an elastic member providing an elastic force in a direction in which the contact plate is brought into contact with the movable contact is provided in a pin insertion groove of the shaft body. ### Claim 6 (depends on 1) The molded case circuit breaker of claim 1, wherein the insulating barrier comprises a cover portion covering an opening portion of the shaft body and an arc interrupting portion extended to one end of the cover portion. ### Claim 7 (depends on 6) The molded case circuit breaker of claim 6, wherein a mover insertion hole into which the movable contact is configured to be inserted is formed on the cover portion. ### Claim 8 A molded case circuit breaker, comprising: a fixed contact; a movable contact configured to be brought into contact with or separated from the fixed contact; and an insulating barrier configured to enter between the fixed contact and the movable contact during interruption, wherein the insulating barrier is coupled to the movable contact to rotate along a circumferential surface of a shaft body, wherein a circumferential groove-shaped plate groove is formed on the shaft body, and a contact plate sliding along the plate groove is provided in the plate groove. ### Claim 9 (depends on 8) The molded case circuit breaker of claim 8, wherein the plate groove is formed smaller than a radius of the circumferential surface of the shaft body. ### Claim 10 (depends on 8) The molded case circuit breaker of claim 8, wherein an elastic member providing an elastic force in a direction in which the contact plate is brought into contact with the movable contact is provided in a pin insertion groove of the shaft body. ### Claim 11 A molded case circuit breaker, comprising: a fixed contact; a movable contact configured to be brought into contact with or separated from the fixed contact; and an insulating barrier configured to enter between the fixed contact and the movable contact during interruption, wherein the insulating barrier is coupled to the movable contact to rotate along a circumferential surface of a shaft body, wherein the insulating barrier comprises a cover portion covering an opening portion of the shaft body and an arc interrupting portion extended to one end of the cover portion, wherein a mover insertion hole into which the movable contact is configured to be inserted is formed on the cover portion.