An overview of the resettable fuse PPTC in the overcurrent protection device is as follows:
PPTC fuse is an overcurrent protection device with self-recovery characteristics. PPTC fuses are usually composed of conductive polymer materials, and when the current is excessive, its resistance increases rapidly, restricting the flow of current, thus protecting the circuit from damage. Unlike traditional fuses, PPTC fuses will automatically recover under overload conditions, which is suitable for occasions with multiple overload protection.
How PPTC fuses work:
1. For example, in its normal working state: under normal current conditions, the polymer conductor inside the PPTC fuse has a low resistance, and the current can pass through smoothly. However, in the overload state, when the current exceeds the safe value, the temperature of the polymer material rises, resulting in a rapid increase in its resistance. As the resistance increases, the flow of current is restricted, and the protection circuit is not damaged.
2. In the recovery state stage: Once the overload condition is lifted, the PPTC material is cooled, the resistance returns to normal value, the current can resume normal flow, and the equipment starts working again.
About the features of PPTC:
1) Self-recovery: The biggest feature of PPTC fuse is self-recovery. Unlike conventional fuses, they do not need to be replaced due to overcurrent damage, and the fuse automatically recovers as soon as the fault condition is eliminated.
2) No open circuit and no residual damage: PPTC fuses will not disconnect the circuit like traditional fuses, so there will be no secondary damage to electrical equipment.
3) Fast response: PPTC material can quickly heat up under overload current, increase resistance extremely quickly, and provide effective overload protection.
4) Long life:** Due to its self-healing characteristics, PPTC fuses have a much longer life than traditional fuses and are suitable for equipment that requires frequent protection and restarts.
Description of the application of PPTC:
1. Battery protection: PPTC fuses are widely used in lithium batteries and battery packs to prevent thermal runaway or fire caused by overcurrent.
1. Battery protection: PPTC fuses are widely used in lithium batteries and battery packs to prevent thermal runaway or fire caused by overcurrent.
2. Communication equipment: In communication systems, PPTC fuses can protect circuits from short circuits or overloads, reducing the risk of equipment damage.
3. Consumer electronics: In consumer electronics such as mobile phones, laptops, and game consoles, PPTC fuses are often used to protect internal circuits.
4. Automotive electronics: In the automotive electrical system, PPTC fuses can prevent electrical equipment from being damaged due to short circuit or overload.
5. Home appliances: PPTC fuses can be used in refrigerators, air conditioners, washing machines and other home appliances to ensure the safety of the circuit.
