Mitsubishi HK-KT63WB 4-Pole Circuit Breaker 63-125A

The Mitsubishi HK-KT63WB is a 4-pole molded-case circuit breaker designed for power distribution and branch circuit protection in industrial electrical installations. It features an adjustable rated current range from 63 to 125 amperes, making it suitable for a variety of load configurations. The ultimate and service short-circuit breaking capacities are both rated at 36 kA at 440 VAC, ensuring reliable fault current interruption under demanding conditions. The four-pole configuration provides simultaneous switching and protection of all phase conductors and the neutral line, which is essential in three-phase power systems requiring full isolation. The HK-KT63WB is typically used inside motor control centers, switchboards, and panel boards to safeguard downstream equipment such as motors, drives, transformers, and feeders. Its compact molded-case design allows straightforward DIN-rail or panel mounting and simplifies wiring during installation and maintenance. This circuit breaker is a genuine Mitsubishi Electric component intended as a direct replacement in systems that specify the HK-KT series breakers.