Additional Information

PTC resettable fuse is an electronic protection device based on the positive temperature coefficient (PTC) effect. It utilizes the material's positive temperature coefficient characteristic, where the resistance value significantly increases as the temperature rises, to achieve circuit protection. Under normal circuit operation, the PTC fuse remains in a low-resistance state, allowing current to pass through smoothly. In the event of an overcurrent condition, the PTC element rapidly heats up due to the heat generated by the current, causing its resistance to increase sharply by several orders of magnitude and enter a high-resistance state. This effectively creates an "open circuit," thereby limiting the current and protecting other sensitive components in the circuit from overcurrent damage. Once the fault is cleared and the current returns to normal levels, the PTC fuse gradually dissipates heat, its resistance decreases, and it returns to the low-resistance state, restoring circuit conduction. This enables self-recovery without the need for manual replacement.