# US 2025/0157774 A1 · Chip fuse with floating leads > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0157774 A1 - Document ID: US20250157774A1 - Status: Published application - Kind: A1 - Application number: 18/930,138 - Filed: 2024-10-29 - Published: 2025-05-15 - Earliest claimed: 2023-11-13 - Assignees: Littelfuse, Inc. - Applicants: Littelfuse, Inc. - Inventors: Maria Lily Espenilla Rosios; Caryl Nicole Aleta - Web page: https://patentgrep.com/patent/US20250157774A1 ## CPC - H01H 85/055: Fusible members - H01H 85/0241: {Structural association of a fuse and another component or apparatus (switches with built-in fuses H01H9/10, spark-gap arresters H01H85/44, transformers and inductances H01F27/402, capacitors H01G2/14, lamps H01K1/66, semiconductors H10W20/493 or H10W42/80)} - H01H 85/143: Electrical contacts; Fastening fusible members to such contacts - 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 chip fuse including a fuse body with an electrically insulating floating lead support layer, a metallic first floating lead and a metallic second floating lead disposed on the floating lead support layer and spaced apart to define a gap therebetween, an electrically insulating fuse support layer disposed adjacent, and parallel to, the floating lead support layer, and an electrically conductive fuse layer disposed on the fuse support layer, the fuse layer including a first terminal portion and a second terminal portion connected by a fusible portion. The chip fuse further includes an electrically conductive first end termination and an electrically conductive second end termination disposed on opposing ends of the fuse body, wherein the first end termination is electrically connected to the first terminal portion and the first floating lead and wherein the second end termination is electrically connected to the second terminal portion and the second floating lead. ## Claims ### Claim 1 A chip fuse comprising: a fuse body comprising: an electrically insulating floating lead support layer; a metallic first floating lead and a metallic second floating lead disposed on the floating lead support layer in a spaced apart arrangement to define a gap between the first floating lead and the second floating lead; an electrically insulating fuse support layer disposed adjacent, and parallel to, the floating lead support layer; and an electrically conductive fuse layer disposed on the fuse support layer, the fuse layer comprising a first terminal portion and a second terminal portion connected by a fusible portion; and an electrically conductive first end termination and an electrically conductive second end termination disposed on opposing ends of the fuse body, wherein the first end termination is electrically connected to the first terminal portion and the first floating lead and wherein the second end termination is electrically connected to the second terminal portion and the second floating lead. ### Claim 2 (depends on 1) The chip fuse of claim 1, further comprising at least one electrically insulating barrier layer disposed atop the first floating lead and the second floating lead in a parallel relationship with the floating lead support layer. ### Claim 3 (depends on 1) The chip fuse of claim 1, wherein the floating lead support layer and the fuse support layer are formed of ceramic tape. ### Claim 4 (depends on 1) The chip fuse of claim 1, wherein the floating lead support layer is a first floating lead support layer and wherein the fuse body further comprises a second floating lead support layer disposed adjacent, and parallel to, the first floating lead support layer and having a third floating lead and a fourth floating lead disposed thereon in a spaced apart relationship to define a gap between the third floating lead and the fourth floating lead. ### Claim 5 (depends on 4) The chip fuse of claim 4, wherein the first floating lead and the second floating lead are asymmetrical, and wherein the third floating lead and the fourth floating are a mirror image of the first floating lead and the second floating lead. ### Claim 6 (depends on 1) The chip fuse of claim 1, wherein the fuse support layer is a first fuse support layer and the fuse layer is a first fuse layer, and wherein the fuse body further comprises a second fuse support layer disposed adjacent, and parallel to, the first fuse support layer and having a second fuse layer disposed thereon. ### Claim 7 (depends on 1) The chip fuse of claim 1, further comprising a protective layer disposed on the fuse layer. ### Claim 8 (depends on 7) The chip fuse of claim 7, wherein the protective layer is formed of one of FR-4 and ceramic. ### Claim 9 (depends on 7) The chip fuse of claim 7, wherein the protective layer is formed of glass. ### Claim 10 (depends on 1) The chip fuse of claim 1, wherein the first end termination and the second end termination are each formed of a plurality of layers of electrically conductive material. ### Claim 11 A chip fuse comprising: a fuse body comprising: an electrically insulating first floating lead support layer; a metallic first floating lead and a metallic second floating lead disposed on the floating lead support layer in a spaced apart arrangement to define a gap between the first floating lead and the second floating lead; an electrically insulating second floating lead support layer disposed on the first floating lead and the second floating lead; a metallic third floating lead and a metallic fourth floating lead disposed on the second floating lead support layer in a spaced apart arrangement to define a gap between the third floating lead and the fourth floating lead; at least one electrically insulating barrier layer disposed on the third floating lead and the fourth floating lead; an electrically insulating fuse support layer disposed on the at least one barrier layer; an electrically conductive fuse layer disposed on the fuse support layer, the fuse layer comprising a first terminal portion and a second terminal portion connected by a fusible portion; and an electrically insulating protective layer disposed on the fuse layer; and an electrically conductive first end termination and an electrically conductive second end termination disposed on opposing ends of the fuse body, wherein the first end termination is electrically connected to the first terminal portion, the first floating lead, and the third floating lead, and wherein the second end termination is electrically connected to the second terminal portion, the second floating lead, and the fourth floating lead. ### Claim 12 (depends on 11) The chip fuse of claim 11, wherein the first floating lead support layer, the second floating lead support layer, the barrier layer, and the fuse support layer are formed of ceramic tape. ### Claim 13 (depends on 11) The chip fuse of claim 11, wherein the first floating lead and the second floating lead are asymmetrical, and wherein the third floating lead and the fourth floating are a mirror image of the first floating lead and the second floating lead. ### Claim 14 (depends on 11) The chip fuse of claim 11, wherein the fuse support layer is a first fuse support layer and the fuse layer is a first fuse layer, and wherein the fuse body further comprises a second fuse support layer disposed adjacent, and parallel to, the first fuse support layer and having a second fuse layer disposed thereon. ### Claim 15 (depends on 11) The chip fuse of claim 11, wherein the protective layer is formed of one of FR-4 and ceramic. ### Claim 16 (depends on 11) The chip fuse of claim 11, wherein the protective layer is formed of glass. ### Claim 17 (depends on 11) The chip fuse of claim 11, wherein the first end termination and the second end termination are each formed of a plurality of layers of electrically conductive material.