As a component that permanently disconnects the circuit under abnormal conditions (overload current passes), the fuse plays a vital role in the safety of the vehicle body, so the blown time index of the fuse is one of the items that must be tested. In the ISO8820-5_2015 and ISO8820-1_2014 road vehicle fuse national standards, the parameter definitions and test indicators of the fuse are described in detail.
Due to the large rated current of automotive fuses, the fusing time test mainly faces the following challenges:
1) For the instantaneous fusing current test up to thousands of amperes, the test equipment must rise to the specified current within us, otherwise the fuse will be disconnected and the current has not reached the specified value, and the purpose of the experiment cannot be achieved;
2) The instantaneous fusing time is generally at the us level, how to accurately measure the time at the us level requires extremely high sampling rate of the test equipment;
3) How to realize automated testing, including fuse durability testing, current cycle testing, etc.

ITECH has been deeply involved in high-current automotive fuse test solutions for several years, providing fully automated test solutions for world-renowned fuse manufacturers. The system is matched with IT8900A series high-speed electronic load, which can realize high-current fusing test above 3000A.

Not only that, the IT8900A series electronic loads have a built-in time measurement function, which does not require an oscilloscope, with a sampling rate up to 50KHz, the data of the fusing current can be accurately obtained, and the fusing time can be automatically measured. The fully automated PC software can output reports after the test, effectively improving the test efficiency.