The large current generator is essential equipment in the power and electrical industry for debugging in places requiring large currents. This device features easy maintenance, superior performance, safe and reliable use, attractive appearance, sturdy durability, and convenient mobility. It can output large currents for extended periods or continuously output maximum current for short durations. It is used for testing thermal relays, switches, transformers, AC contactors, protection circuits, etc.; directly measuring the transformation ratio and polarity of CTs; and switch action time; for defective test objects, it is a destructive test. It is necessary equipment for power supply enterprises, large factories, metallurgy, power plants, railways, and other departments requiring power maintenance. It needs to have high-power output power supply to meet test requirements, and also be convenient for test personnel to use and carry. During the testing process, frequent transportation and movement (causing vibration) must not compromise the accuracy and reliability of the test. After power failure, there is no need to re-zero and adjust before continuing the test. It adopts advanced microelectronic processing technology, and the entire process can be set in advance, with a full Chinese interface and simple operation. After all test items are set, the test is automatically performed without manual intervention. It can be used in harsh environments such as high temperature, high humidity, at sea, extreme cold, and high altitude.