Examining the Causes of Circuit Failures from the Blown Fuse

fish001

Examining the Causes of Circuit Failures from the Blown Fuse [Copy link]

The blown fuse is one of the common faults in the circuit. If it is not handled properly, it will cause new faults. Therefore, we should learn to judge the cause of the circuit fault from the condition of the fuse blowing. 1. The fuse blows quickly, often with a "pop" sound. Most of the fuses turn into small round beads. The gap where the fuse is disconnected is large. Sometimes the entire fuse is almost completely melted. This situation shows that the fuse blows due to a short circuit. Therefore, only by finding the short-circuit grounding point, eliminating the short-circuit fault, and then connecting the fuse can the circuit work normally. 2. The fuse is disconnected from the middle, the gap is small, and there are very thin residual parts at both ends. This is because the fuse is too thin or the current passing through the line is too large. Therefore, a slightly thicker fuse should be selected for installation. 3. The fuse is blown at the joint with the screw, and the disconnection gap is small. This is because the fastening screws that fix the fuse are not tightened, the fuse and the screw are not in good contact, the resistance is too large when the current passes through, the heat generated is also increased, the speed at which the heat is dissipated cannot keep up with the heat generated, and the fuse is blown. In this case, you can directly connect the fuse and tighten the fastening screws. 4. The fuse is blown at an uncertain position and the disconnection gap is small. This situation is generally caused by the fuse being stretched longitudinally or there being a notch in the radial position, causing the local diameter of the fuse to become thinner. Just replace it with a new fuse.