The three-phase relay protection tester can test traditional relays and protection devices, as well as modern microcomputer protection, especially for transformer differential protection and automatic switching devices, making the test more convenient. 

The instrument uses a stainless steel panel, an membrane keyboard, and a touch mouse, which overcomes the shortcomings of inflexible operation and easy damage to the trackball mouse. The 8.4-inch TFT true color display with a resolution of 800×600 is used, making it stand-alone The overall operation is convenient and free, and durable.