Hitachi's AKN/AKS/AKH series Air Circuit Breakers provide a compact, full line-up solution up to 6300A with breaking capacities up to 150kA at 500VAC. They feature advanced trip relays (N, A, P, S types) offering comprehensive protection (e.g., overcurrent, short-circuit, ground fault, voltage/frequency unbalance) and advanced monitoring/communication (Modbus/RS-485/Profibus-DP, Zone Selective Interlocking (ZSI)). Technical specifications include 1000V rated insulation, 690V operating voltage, and 100% N-phase current capacity. With diverse connection methods and extensive accessories, these breakers ensure user-friendly operation and seamless integration into power monitoring systems.