Mitsubishi HK-KT7M3G1-1-12 4-Pole Circuit Breaker 125-250A

The Mitsubishi HK-KT7M3G1-1-12 is a 4-pole circuit breaker designed for overcurrent and short-circuit protection in industrial electrical distribution systems. It features an adjustable rated current (Ir) range of 125 to 250 amperes, allowing flexible configuration to suit different load requirements. The unit provides a rated ultimate and service short-circuit breaking capacity (Icu = Ics) of 36 kA at 440 V AC, which means it maintains full serviceability even after clearing a fault at its maximum rated breaking capacity. The 4-pole design enables simultaneous switching and protection of three-phase circuits along with a neutral conductor, making this breaker well suited for use in power distribution panels, motor control centers, and switchgear assemblies. Typical applications include factory automation infrastructure, building electrical systems, and any installation where dependable protection against overcurrent and short-circuit events is essential. The equal Icu and Ics values reflect a high level of reliability, confirming that the breaker can continue normal operation without replacement or maintenance after interrupting a fault at its rated capacity.