Mitsubishi HK-KT634WJWS 4-Pole 125A Molded Case Circuit Breaker WS-V NF-H Series

The Mitsubishi HK-KT634WJWS is a molded case circuit breaker (MCCB) belonging to the WS-V series, NF-H high-performance class. It features a 4-pole (4P) configuration with a rated current of 125 amperes and a short-circuit breaking capacity (Icu) of 50 kA at 400 V AC, tested in accordance with IEC 60947. The breaker is equipped with a fixed thermal-magnetic trip unit that provides dependable overcurrent and short-circuit protection without the need for external adjustments. Electrical connections are made through solderless box terminals, which simplify wiring and reduce installation time while ensuring secure, vibration-resistant contact. The NF-H class designation indicates enhanced interruption performance compared to standard-class models in the Mitsubishi MCCB lineup, making this breaker well suited for power distribution panels, motor control centers, and other demanding industrial and commercial electrical systems. Its four-pole design allows simultaneous switching and protection of three phase conductors plus a neutral, supporting applications that require complete isolation of all current-carrying paths. The HK-KT634WJWS is a reliable component for main and branch circuit protection in facilities that demand high breaking capacity and consistent performance.