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Fuse Overcurrent Protection
- Oct 10, 2017 -

Self-complex fuse is a new type of polymer positive temperature coefficient over-current protection components, circuit can be short-circuit and overload protection, unlike the traditional fuse is, Fuse since the complex fuse in the fault removal and power cut, can be automatically restored, no need to replace.

Formerly electronic equipment, instrumentation using traditional fuses for overcurrent protection, but only can be protected once, burn off must be replaced, but also will appear fuse abnormal burn conditions, such as start-up moments, unplug devices, bad contact, the use of fuse time too long, will lead to fuse burning. Fuse should be replaced in accordance with the provisions of the same specifications, but in the industrial scene often have what fuse on the case of what fuse, and caused by the wrong replacement, Fuse sometimes because the fuse specification is too large, the fault caused by the current of the electronic equipment to burn the components, causing failure to expand the accident occurred.

Self-complex fuses are mainly composed of specially treated polymeric resins (polymer) and conductors, in the normal state, the polymer tightly binds the conductor to the crystalline structure, forming a low impedance chain lock, because the impedance is only dozens of ohms, although the current passes through the self complex fuse, Fuse but the heat produced is very small, Without changing the crystalline structure of the polymer, when the abnormal current occurs, the heat produced on the conductor will turn the polymer grains from crystallization to colloidal form, at this time, the conductor bound in the polymer will be separated, causing the resistance to rise rapidly, limiting the abnormal current flow through the self-recovery fuse. When the abnormal current is eliminated, the conductor chain key is again established to restore the low resistance. Its protective action is essentially a process of energy balance, when the current flows through the self complex fuse, due to the $literal relationship will generate heat, when the current or ambient temperature rise in the self-complex fuse resistance will also rise, Fuse but because the current or the temperature rise is not significant, the resulting heat can be emitted into the environment, and to achieve balance If the current or ambient temperature continues to rise to generate heat at a time difficult to send out, resulting in a rapid increase in the temperature of the fuse, at this point, very small temperature changes will cause a large increase in resistance, the increase in resistance will limit the current, thus protecting the use of electrical equipment. Fuse In the protection of the self-complex fuse, as long as the application of voltage, the energy generated enough to replenish the loss of heat, will always be in an action state, when the applied voltage decreases or disappears, it can be automatically restored.