A PPTC resettable fuse harmoniously integrates advanced polymer material technologies, conductive material science, novel processing engineering, fundamental electronic and electrical theory. The electrical resistance of these materials and devices increases with temperature rises, while the resistance decreases with temperature drops. PPTC resettable fuse manufacturers have successfully integrated these elements and developed a diverse range of PPTC devices specifically designed to safeguard circuits from overcurrent.

PPTC resettable fuses are meticulously designed and fabricated from patented novel PPTC material in a thin chip form. This material consists of conductive particles dispersed within a polymer matrix that possesses a crystalline structure. Under normal operating conditions, numerous chains form conductive pathways throughout the PPTC material. However, in the event of a fault (tripped state), excessive current flows through the device, causing the PPTC material to heat up. This transformation from a crystalline to an amorphous polymer matrix disrupts the conductive particle alignment, resulting in a significant increase in the device’s resistance. Upon removal of the fault current, the resettable fuse is restored to its original state, enabling the current to flow through the circuit once again.