A fuse, characterized in that it comprises: first and second conductors (2a, 2b) each disposed between upper and lower shells (1, 5), first ends of the first and second conductors (2a, 2b) being disposed in acavity respectively and opposite to each other to define a gap therebetween, and second ends of the first and second conductors (2a, 2b) being extended out from the cavity along a transversal direction respectively; a conductive bar disposed in the gap along a longitudinal direction and welded to the first ends of the first and second conductors (2a, 2b) to form first and second welding seams (6a, 6b) at two sides of the conductive bar in the transversal direction respectively, each of the first and second welding seams (6a, 6b) having a resistivity greater than that of each of the conductive bar and the first and second conductors (2a, 2b); characterized by the upper and lower shells (1, 5) coupled to each other to define the cavity; first and second pushing units (4a, 4b) each mounted onto either of the upper and lower shells (1, 5), the first and second pushing units (4a, 4b) being spaced apart from each other in the longitudinal direction and connected with the first and second ends of the conductive bar respectively to normally push the conductive bar in a direction away from the gap, wherein each of the first and second pushing units (4a, 4b) comprises: a fixed barrel mounted onto one of the upper shell and the lower shell; a moveable rod having an inner end movably fitted within the fixed barrel and an outer end extending out from the fixed barrel to connect with the conductive bar; and an elastic element disposed in the fixed barrel and located between the inner end of the moveable rod and the bottom of the fixed barrel. first and second conductors (2a, 2b) each disposed between upper and lower shells (1, 5), first ends of the first and second conductors (2a, 2b) being disposed in acavity respectively and opposite to each other to define a gap therebetween, and second ends of the first and second conductors (2a, 2b) being extended out from the cavity along a transversal direction respectively; a conductive bar disposed in the gap along a longitudinal direction and welded to the first ends of the first and second conductors (2a, 2b) to form first and second welding seams (6a, 6b) at two sides of the conductive bar in the transversal direction respectively, each of the first and second welding seams (6a, 6b) having a resistivity greater than that of each of the conductive bar and the first and second conductors (2a, 2b); characterized by the upper and lower shells (1, 5) coupled to each other to define the cavity; first and second pushing units (4a, 4b) each mounted onto either of the upper and lower shells (1, 5), the first and second pushing units (4a, 4b) being spaced apart from each other in the longitudinal direction and connected with the first and second ends of the conductive bar respectively to normally push the conductive bar in a direction away from the gap, wherein each of the first and second pushing units (4a, 4b) comprises: a fixed barrel mounted onto one of the upper shell and the lower shell; a moveable rod having an inner end movably fitted within the fixed barrel and an outer end extending out from the fixed barrel to connect with the conductive bar; and an elastic element disposed in the fixed barrel and located between the inner end of the moveable rod and the bottom of the fixed barrel. a fixed barrel mounted onto one of the upper shell and the lower shell; a moveable rod having an inner end movably fitted within the fixed barrel and an outer end extending out from the fixed barrel to connect with the conductive bar; and an elastic element disposed in the fixed barrel and located between the inner end of the moveable rod and the bottom of the fixed barrel.