Under normal operation, the polymer resin tightly binds conductive particles to the crystalline structure, forming a chain like conductive electrical pathway. At this time, the self recovery fuse is in a low resistance state (a), and the heat generated by the current flowing through the self recovery fuse on the circuit is small and does not alter the crystal structure

When a circuit experiences a short circuit or overload, the large current flowing through the self recovery fuse causes the heat generated to melt the polymer resin, rapidly increase its volume, and form a high resistance state (b). The working current rapidly decreases, thereby limiting and protecting the circuit

After troubleshooting, the self recovery fuse cools and crystallizes again, shrinks in volume, and conductive particles form a conductive path again. The self recovery fuse returns to a low resistance state, thus completing the protection of the circuit without the need for manual replacement