a) The most obvious difference between polymer PTC resettable fuses and ordinary fuses is their resettable characteristics. Although both can provide overcurrent protection, polymer PTC resettable fuses can provide many overcurrent protections, while ordinary fuses Once blown, it must be replaced to make the circuit work properly.
b) The difference between polymer PTC resettable fuse and bimetal is not that it can be resettable. Bimetal can reset itself when the fault still exists. When it is operating, a large voltage is generated and faults that may damage the equipment are turned on again. The polymer PTC resettable fuse will remain in a high resistance state until the fault is eliminated.
c) The difference between polymer PTC resettable fuses and ceramic resettable fuses lies in their initial resistance, reaction time to failure and size. Both are self-resetting, but they are the same as ceramic resettable fuses with the same holding current In contrast, polymer resettable fuses operate faster due to their smaller size.