Cost-effective protection relay test set, standard 4-phase voltage 3-phase current output, large-screen LCD, complete interface, integrated single-chassis structure, rich contacts, input contact bit empty contact and 0~250V potential contact compatible, intelligent. Cost-effective protection relay test set, standard 4-phase voltage 3-phase current output, large-screen LCD, complete interface, integrated single-chassis structure, rich contacts, input contact bit empty contact and 0~250V potential contact compatible, intelligent. 1. Meet all test requirements on site. The instrument has standard four phase voltage and three-phase current output. It can test not only various traditional relays and protection devices, but also various modern microcomputer protections, especially for transformer differential protection and. Test-330 three phase microcomputer protection relay test system is the highly efficient relay test equipment of GFUVE company. A Microcomputer Protection Relay. Low price 3 phase relay tester kit for sale, microcomputer control, with big LCD display, high-resolution, high degree of automation, real-time storage of test data, reliable and comprehensive protection measures, powerful software. It delivers flexible voltage and current outputs with excellent accuracy and stability, supporting a wide range of test scenarios including overcurrent.