Usage:Resettable Breaking Capacity:High Safety Standards:SAE Amps:5-30Amp
Self-recovery fuse is a kind of over-current electronic protection element. It is made of high molecular weight organic polymer under high pressure, high temperature, and vulcanization reaction conditions. Traditional fuse overcurrent protection can only be protected once and needs to be replaced if it blows out, while the self-recovery fuse has the dual functions of overcurrent and overheat protection and automatic recovery.
Miniaturized single pole press-to-reset thermal circuit breaker designed. For automotive fuse block installation. Extends the benefits of circuit breaker performance and Convenience to the application which are most critical. Manual release option.
The resettable fuse is composed of a specially treated polymer resin (Polymer) and conductive particles (Carbon Black) in it. Under normal operation, the polymer resin tightly binds the conductive particles outside the crystalline structure to form a chain-shaped conductive electrical path. At this time, the resettable fuse is in a low-resistance state. The thermal energy is small and will not change the crystal structure. When the circuit is short-circuited or overloaded, the large current flowing through the resettable fuse, the heat generated will melt the polymer resin, the volume will increase rapidly, a high-resistance state will be formed, and the working current will decrease rapidly, thereby limiting and protecting the circuit. After the fault is removed, the self-recovery fuse re-cools and crystallizes, the volume shrinks, and the conductive particles form a conductive path again. The self-recovery fuse returns to the low-resistance state, thereby completing the protection of the circuit without manual replacement.
Self-recovery fuses can be divided into 2 types according to materials: 1. Polymeric polymer PPTC; 2. Ceramic CPTC two self-recovery fuses.
According to the package form, it can be divided into 2 types: 1. Lead plug-in; 2. SMD patch.
It can also be divided into 600V, 250V, 130V, 120V, 72V, 60V, 30V, 24V, 16V, 6V, etc. according to the voltage.
The main advantages of polymer PPTC are: the zero-temperature resistance at room temperature can be made very small, high-current products have only a few milliohms, the power consumption on the road is small, can be ignored, and the volume is relatively small.
It can be connected in series in the vulnerable circuit for overcurrent protection and temperature fuse. The resistance value changes quickly. In the order of several ms, the heat capacity is small, the recovery time is short, the impact resistance, and the cycle protection can be up to 8000 times.
PTC can be used as a thermal fuse, so the performance of the thermal fuse and the role of the thermal fuse are reflected in the circuit to a certain extent.
To achieve the dual protection of over-current protection and over-temperature protection in the circuit.
The main advantages of ceramic CPTC are that it is easy to manufacture and relatively cheap, but it has large resistance, large volume, and large road loss. It has a range of tens to thousands of Ω. It is suitable for small current overcurrent protection. (Resistance value becomes smaller), the protection speed is slow, in the order of hundreds of ms, the heat capacity is large, and the recovery time is long.
The application range is relatively narrow. For example, it cannot be applied to fast-protected circuits, automotive wiring harness protection, PCB trace protection, etc. It is mostly used for heating devices, and can be used in some small signal circuits where loss is not considered.