What is the difference between resettable fuses and traditional fuses?

　　PPTC and fuses both do the same job: protecting electronic circuits from overcurrent related issues. The difference is that the fuse must be replaced after tripping, while PPTC can reset itself. PPTC can handle sudden overcurrent events without the need for replacement.

　　PPTC and fuses both react to excessive current by generating heat, but they react in different ways. The fuse melts and breaks, completely interrupting the current, while PPTC limits the current by changing from a low resistance state to a high resistance state as the temperature increases. In short, if it is necessary to stop the current to fully protect the equipment, fuses are preferred. On the other hand, PPTC is typically used to anticipate situations where overcurrent events frequently occur, and it is crucial to maintain a constant system uptime at a lower service cost. They are also useful in remote or hard to reach places where replacing fuses is challenging.

　　Both circuit breakers and resettable fuses can ensure circuit safety. A circuit breaker is an electromechanical device designed to "trip" or disconnect contacts when the current exceeds the rated value, stopping the current and preventing damage to electrical equipment or wiring. After the circuit breaker trips, it can be reset through the switch. Circuit breakers are an important component of any power distribution system. The resettable fuse (PPTC) performs a similar function, tripping if the current exceeds the rated value. The difference is that when there is no longer an overcurrent situation, the resettable fuse will automatically reset. When the circuit breaker trips, the current is completely cut off, while the resettable fuse may still allow small currents to pass through.

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