A thermal cutoff having elongated shape with a vertical configuration, comprising a first fusible element, a second fusible element, and a closed cavity bounded by a housing (101, 201, 301) with an open end, a cover plate (102, 202, 302), and a sealant (103, 203, 303), wherein a direction extending from a closed end of the housing to the open end of the housing is defined as the vertical direction; the first fusible element and the second fusible element are provided in the closed cavity and arranged relatively to each other in the vertical direction; two ends of the first fusible element and two ends of the second fusible element are connected in parallel to a first electrode plate (108, 208, 308) and a second electrode plate (109, 209, 309), respectively; the first fusible element is a current-carrying fusible element, and the second fusible element is a high-voltage fusible element; the current-carrying fusible element comprises a current carrier (104, 204, 304), and the high-voltage fusible element comprises a U-shaped fuse link (106, 206, 306) with parallel segments at two ends; wherein a melting point of the current carrier is lower than a melting point of the fuse link, and an internal resistance value of the current carrier is lower than an internal resistance value of the fuse link; wherein the cover plate (102, 202, 302) is inserted and fitted in the closed cavity to divide the closed cavity into a first cavity (101a, 201a, 301a) and a second cavity (101b, 201b, 301b), wherein the first cavity (101a, 201a, 301a) and the second cavity (101b, 201b, 301b) are arranged relatively to each other in the vertical direction; and the first fusible element and second fusible element are arranged in the first cavity (101a, 201a, 301a) and the second cavity (101b, 201b, 301b), respectively; the cover plate (102, 202, 302) comprises a bottom plate, a first partition plate, a second partition plate, and a third partition plate; wherein the bottom plate is located at a lower end of the cover plate (102, 202, 302); the first partition plate, the second partition plate, and the third partition plate are perpendicular to the bottom plate; the first partition plate and the second partition plate are arranged in parallel at intervals; the third partition plate is perpendicular to both the first partition plate and the second partition plate; the third partition plate separates parallel segments of the fuse link (106, 206, 306) from each other; and the first partition plate and the second partition plate are configured for separating two outer sides of the fuse link (106, 206, 306), respectively. a first fusible element, a second fusible element, and a closed cavity bounded by a housing (101, 201, 301) with an open end, a cover plate (102, 202, 302), and a sealant (103, 203, 303), wherein a direction extending from a closed end of the housing to the open end of the housing is defined as the vertical direction; the first fusible element and the second fusible element are provided in the closed cavity and arranged relatively to each other in the vertical direction; two ends of the first fusible element and two ends of the second fusible element are connected in parallel to a first electrode plate (108, 208, 308) and a second electrode plate (109, 209, 309), respectively; the first fusible element is a current-carrying fusible element, and the second fusible element is a high-voltage fusible element; the current-carrying fusible element comprises a current carrier (104, 204, 304), and the high-voltage fusible element comprises a U-shaped fuse link (106, 206, 306) with parallel segments at two ends; wherein a melting point of the current carrier is lower than a melting point of the fuse link, and an internal resistance value of the current carrier is lower than an internal resistance value of the fuse link; wherein the cover plate (102, 202, 302) is inserted and fitted in the closed cavity to divide the closed cavity into a first cavity (101a, 201a, 301a) and a second cavity (101b, 201b, 301b), wherein the first cavity (101a, 201a, 301a) and the second cavity (101b, 201b, 301b) are arranged relatively to each other in the vertical direction; and the first fusible element and second fusible element are arranged in the first cavity (101a, 201a, 301a) and the second cavity (101b, 201b, 301b), respectively; the cover plate (102, 202, 302) comprises a bottom plate, a first partition plate, a second partition plate, and a third partition plate; wherein the bottom plate is located at a lower end of the cover plate (102, 202, 302); the first partition plate, the second partition plate, and the third partition plate are perpendicular to the bottom plate; the first partition plate and the second partition plate are arranged in parallel at intervals; the third partition plate is perpendicular to both the first partition plate and the second partition plate; the third partition plate separates parallel segments of the fuse link (106, 206, 306) from each other; and the first partition plate and the second partition plate are configured for separating two outer sides of the fuse link (106, 206, 306), respectively.