▶ 8 & 16 circuit arithmetic type ground Relays ▶ Do setting and that measure of LCD Display (4 X 20 LCD) ▶ Save fault event (Trip circuit, trip current, date and time) at accident occurrence. ▶ According to Circuit, can do free setting of rate frequency. (60/50Hz) ▶ Believability elevation through various self-diagnosis and ordinary times watch function embodiment. (Cpu Watch-Dog timer, Memory, Setting value Monitering) ▶ Self-test through passivity trip command. ▶ Convenient RS-485 communication. ▶ ZCT conduction test is number of percent. ▶ Can do setting by each circuit. (operation current, operation time) ▶ Can establish by Auto(Automatic) / Manual(Continuance) of Trip signal. ▶ Solidified EMC/EMI Performance ▶ Date and Time display.