How to see the performance parameters of PTC heater fuse

Performance and parameters of PTC electric heater fuse Rated voltage Rated voltage refers to the maximum voltage that the fuse can withstand after it is disconnected. The voltage on both ends of the fuse is far less than its rated voltage. There are many types of fuses. The commonly used fuses for high-temperature fans can be divided into glass tube fuses (low resolution), ceramic tube fuses (high resolution) and high There are three types of molecular resettable fuses (made of PPTC plastic polymer). Generally, when selecting fuses, the rated voltage is required to be greater than the effective circuit voltage. Rated current The rated current is the maximum current that the fuse can work for a long time. It does not require special temperature controllers and temperature sensors such as thermal resistance thermocouples to perform temperature feedback to control the heating of the heater. Its temperature adjustment is based on its own material characteristics, so that the product has a service life that is much longer than other heaters . PTC heater saves cost and has a long life. Assuming that the protection current is Ir and the rated current of the fuse should be In, the two should meet the following conditions: In=Ir/(fo*f1), fo is the reduction rate for fuse of different specifications, and it is not necessary for the fuse of ICE specification Plus reduction rate, that is, fo=1, for UL-standard fuses, the reduction rate fo=0.75. f1 is the reduction rate after considering the temperature. The higher the ambient temperature, the hotter the fuse will work and the shorter the life span. What I want to emphasize here is the temperature of the air surrounding the fuse and should not be confused with room temperature.