PTC (Positive Temperature Coefficient, positive temperature coefficient) resettable fuse is a special protection device, mainly used for circuit protection to prevent overcurrent and overload conditions. It has self-restoring properties when working, so it is also called a self-restoring fuse.

 Working principle

The working principle of PTC resettable fuse is based on the positive temperature coefficient characteristics of its material. When current passes through a PTC device, if the current exceeds its rating, the temperature of the PTC will increase, causing its resistance to increase dramatically, thereby limiting the flow of current. This high-resistance state effectively protects downstream circuitry from overcurrent damage. Once the overload condition is relieved, the temperature of the PTC decreases, its resistance returns to a low value, and current can then pass normally, restoring circuit functionality.

 Features and Benefits

1. Self-recovery function: Unlike traditional fuses, PTC does not need to be replaced after a fault; once the overload condition is over, PTC will automatically return to normal working status.

2. Miniaturized design: PTC equipment is usually small and easy to integrate into electronic equipment.

3. High sensitivity: able to quickly respond to over-current and short-circuit conditions and provide effective protection.

4. No mechanical parts: There are no mechanical moving parts inside the PTC, making it highly reliable.

 Application areas

- Electronic equipment: widely used in consumer electronics such as computers, mobile phones, and televisions for power management and signal protection.

- Automotive electronics: used for protection in automobile circuits, such as battery protection, lighting systems, etc.

- Industrial equipment: used for overcurrent protection of motors, transformers and other industrial equipment.

- Home Appliances: Used to protect power lines in home appliances such as refrigerators, washing machines, and air conditioners.

 in conclusion

PTC resettable fuse is an efficient and safe circuit protection solution. With its superior performance and self-restoration characteristics, it has become an indispensable protection component in modern electronic equipment.