Traditional fuses can only protect against overcurrent once, after which they must be replaced. The PTC resettable fuse is a new type of overcurrent protection element that has two functions: providing overcurrent protection and automatic reset.

Technicians connect the overcurrent protection PTC element serially to the circuit; under normal circumstances, it provides a low resistance state, ensuring the circuit functions normally. If a short circuit or unusually high current occurs, the PTC fuses cut in to reduce the voltage down to a trickle, thus preventing damage and protecting the equipment.

The overcurrent fault’s removal will automatically reset the PTC fuse. The PTC elements will automatically return to its low resistance state, which not only avoids maintenance or replacement but also avoids a continuously circulating switching state, which can cause circuit damage.

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