FUZETEC
- Home
- Products
- Semiconductor Division
- FUZETEC
Semiconductor Division
Fuzetec Technology Co., Ltd. (FUZETEC TM ) was founded in 1999 as the world's leading equipment manufacturer and designer, committed to providing continuous circuit protection solutions for the electronic and electrical industries of today and tomorrow. With state-of-the-art Positive Temperature Coefficient (PTC) conductive polymer technology, FUZETEC TM offers a wide range of polymer PTC resettable fuses to meet the needs of modern demanding high-tech applications. They include but are not limited to: telecommunications, networking, smartphones, tablets, laptops, computers
FUZETEC
PPTC device and resettable fuse (PTC thermistor, PTC variable resistor, variable resistance PTC thermistor, variable resistor, current limiter) technology synergistically integrates advanced polymer material technology, conductive material science, and novel Process engineering and basic electrical and electronic theory. The resistance of such materials and devices increases with temperature and vice versa. Fuzetec has successfully integrated all of this and developed a variety of PPTC devices specifically designed to protect circuits from overcurrent.
How PPTC resettable fuse works
FUZETEC™ Resettable fuses are designed and manufactured using a patented new PPTC material in the form of sheets in which conductive particles are dispersed in a polymer with a crystalline structure. Under normal operating conditions, there are many chains forming conductive paths throughout the PPTC material. During a fault condition (trip condition), excessive current flows through the PPTC device and the PPTC material heats up. This changes the morphology of the polymer matrix from crystalline to amorphous. Under these conditions, the conductive particles separate from each other, most of them no longer conduct current, and the resistance of the device increases dramatically. When the fault current is removed, the resettable fuse is reset and allows current to flow through the circuit again.
PPTC hold/trip current and thermal derating curves
IH (I Hold) is defined as the maximum current that the device can maintain without tripping at rated temperature (23°C). The likelihood of PPTC tripping increases as the current approaches IT (I Trip), which is defined as the minimum current required to cause the PPTC device to trip at rated temperature.
The range of current values between IH and IT represents an area where device tripping performance cannot be accurately predicted (Figure 2, area C). Depending on the initial resistance of the PPTC device, ambient temperature, and mounting conditions, the device can maintain a low-resistance state and hold that current, or it can draw enough current to switch the device to a high-resistance state.