# US 2014/0152418 A1 · Fuse with carbon fiber fusible element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152418 A1 - Document ID: US20140152418A1 - Status: Published application - Kind: A1 - Application number: 13/705,321 - Filed: 2012-12-05 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Eaton Corporation - Applicants: Eaton Corporation - Inventors: James Jeffrey Benke; Robert Neville Parry; Nicholas Paul Brusky - Web page: https://patentgrep.com/patent/US20140152418A1 ## CPC - H01H 85/06: characterised by the fusible material (H01H85/11 takes precedence) - H01H 85/30: Means for indicating condition of fuse structurally associated with the fuse - H01H 85/303: {Movable indicating elements} - H01H 85/38: Means for extinguishing or suppressing arc (by powder filling H01H85/18; by mechanical tension applied to fusible member H01H85/36) - H01H 85/40: using an arc-extinguishing liquid (characterised by the composition of the liquid H01H33/22) - H01H 85/42: using an arc-extinguishing gas (characterised by the composition of the gas H01H33/22) - H01H 85/43: Means for exhausting or absorbing gases liberated by fusing arc, or for ventilating excess pressure generated by heating - H01H 2235/01: Spiral spring - 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 fuse includes a body, a first conductive terminal coupled with a first end of the body, and a second conductive terminal coupled with a second end of the body. The body, the first conductive terminal, and the second conductive terminal define an exterior of the fuse. The fuse also includes an interruption assembly including a fusible element. The fusible element includes carbon fiber, is disposed on a conductive path between the first conductive terminal and the second conductive terminal, and is configured to break when a current through the fusible element exceeds a predetermined current. ## Claims ### Claim 1 A fuse comprising: a body; a first conductive terminal coupled with a first end of the body; a second conductive terminal coupled with a second end of the body, wherein the body, the first conductive terminal, and the second conductive terminal define an exterior of the fuse; and an interruption assembly including a fusible element, the fusible element including carbon fiber, being disposed on a conductive path between the first conductive terminal and the second conductive terminal, and being configured to break when a current through the fusible element exceeds a predetermined current. ### Claim 2 (depends on 1) The fuse of claim 1, wherein the interruption assembly further includes an indicator assembly including an indicator member structured to provide a visible indication when the fusible element breaks. ### Claim 3 (depends on 2) The fuse of claim 2, wherein the indicator assembly includes a spring configured to apply a bias to the indicator member; and wherein the fusible element is configured to maintain the spring in a non-relaxed state when the current through the fusible element is less than the predetermined current, and to break and release the spring when said current exceeds said predetermined current. ### Claim 4 (depends on 3) The fuse of claim 3, wherein when the fusible element breaks and releases the spring, a portion of the indicator member moves through the second conductive terminal to the exterior of the fuse. ### Claim 5 (depends on 3) The fuse of claim 3, wherein when the fusible element breaks, the fusible element breaks into a first portion and a second portion; and wherein an expansion of the spring pulls the first portion of the fusible element away from the second portion of the fusible element. ### Claim 6 (depends on 1) The fuse of claim 1, wherein the fuse includes a chamber having an arc-extinguishing material therein; and wherein the fusible element breaking causes the arc-extinguishing material to emit an arc-extinguishing gas. ### Claim 7 (depends on 6) The fuse of claim 6, wherein the arc-extinguishing material includes boric acid. ### Claim 8 (depends on 1) The fuse of claim 1, wherein the fuse is an expulsion type fuse. ### Claim 9 (depends on 2) The fuse of claim 2, wherein the indicator assembly includes an indicator member and an explosive which, when triggered, forces a portion of the indicator member to move through the first conductive terminal to the exterior of the fuse; and wherein when the fusible element breaks, the explosive is triggered. ### Claim 10 (depends on 1) The fuse of claim 1, wherein the fusible element is a first fusible element; and wherein the fuse includes a number of second fusible elements disposed on other conductive paths between the first conductive terminal and the second conductive terminal. ### Claim 11 (depends on 10) The fuse of claim 10, wherein the at least one of the number of second fusible elements includes carbon fiber. ### Claim 12 (depends on 10) The fuse of claim 10, wherein a resistance of each of the number of second fusible elements is less than a resistance of the first fusible element. ### Claim 13 (depends on 1) The fuse of claim 1, wherein the fuse includes a chamber having sand therein. ### Claim 14 (depends on 1) The fuse of claim 1, wherein the fuse is a current limiting type fuse. ### Claim 15 (depends on 1) The fuse of claim 1, wherein a first portion of the fusible element has a smaller cross-section than a second portion of the fusible element. ### Claim 16 (depends on 1) The fuse of claim 1, wherein the carbon fiber included in the fusible element is a plurality of carbon fiber strands. ### Claim 17 (depends on 16) The fuse of claim 16, wherein a first portion of the fusible element includes fewer of the carbon fiber strands than a second portion of the fusible element. ### Claim 18 (depends on 1) The fuse of claim 1, wherein the fuse is a medium voltage fuse. ### Claim 19 An expulsion type fuse comprising: a body; a first conductive terminal coupled with a first end of the body; a second conductive terminal coupled with a second end of the body, wherein the body, the first conductive terminal, and the second conductive terminal define an exterior of the fuse; a fusible element including carbon fiber, the fusible element being disposed on a conductive path between the first conductive terminal and the second conductive terminal, and being configured to break when a current through the fusible element exceeds a predetermined current; and a spring structured to apply tension to the fusible element such that a first portion of the fusible element moves away from a second portion of the fusible element when the fusible element breaks. ### Claim 20 (depends on 19) The expulsion type fuse of claim 19, wherein the expulsion type fuse includes a chamber having an arc-extinguishing material therein; and wherein the fusible element breaking causes the arc-extinguishing material to emit an arc-extinguishing gas. ### Claim 21 (depends on 19) The expulsion type fuse of claim 19, wherein the arc-extinguishing material includes boric acid.