company news about Ampere second characteristic of fuse

        Ampere second characteristic, also known as protection characteristic, is mainly used to characterize the relationship between the current flowing through the overload protection device and the action time of the protection device. It is one of the main indicators to measure the performance of overload protection devices. Because the overload protection device is based on the heating phenomenon during overload. According to Joule's law, the heat required by the overload protection device in the process of action is certain. Therefore, the action time of overload protection devices should be inversely proportional to the square of current. The greater the current, the shorter the action time.

        The ampere second characteristics of the fuse are mainly determined by the fuse, the force of the external spring and the overall installation position. The fuse is the key component to determine the fuse characteristics.The fuse is actually a thermal sensitive element artificially set in the circuit, which is fused by the fault current passing through it. The requirement for fuse is to quickly, accurately and timely remove the fault capacitor from the system to avoid the expansion of the accident. This undoubtedly requires the fuse to have reliable ampere second characteristics. The ampere second characteristic of the fuse mainly depends on the electrical properties of the melt material. The national standard GB151665-1994 clearly stipulates its technical standard.

        On the premise of meeting the ampere second characteristics, the fuse should also have electrical properties such as anti inrush current, low temperature rise, low power consumption and non reignition. From the mechanical properties of the melt, it should have certain tensile strength, small thermal creep, high temperature sensitivity and other characteristics. After the fuse meets the electrical and mechanical technical indicators, the actual operation and installation also greatly affect the ampere second characteristics of the fuse.