Mitsubishi HK-KT63WK 3-Pole Circuit Breaker 70-100A 36kA at 440VAC

The Mitsubishi HK-KT63WK is a 3-pole molded case circuit breaker designed for power distribution and equipment protection in industrial and commercial electrical systems. It features an adjustable rated current (Ir) range of 70 to 100 amperes, allowing flexible configuration to match the load requirements of the protected circuit. The unit offers a rated ultimate short-circuit breaking capacity (Icu) equal to its rated service short-circuit breaking capacity (Ics) of 36 kA at 440 VAC, ensuring full performance under fault conditions without degradation. This circuit breaker provides reliable overcurrent and short-circuit protection for feeders, motor branch circuits, and distribution panels. Its 3-pole configuration makes it suitable for three-phase AC power systems commonly found in factory automation, HVAC installations, and general-purpose switchgear. The equal Icu and Ics rating indicates a high-performance design that maintains full breaking capability even after clearing a fault at rated capacity. The HK-KT63WK is a direct replacement part for Mitsubishi switchgear assemblies and distribution boards that specify this model.