Mitsubishi HK-KT43G1-1-12 Regenerative Resistor Unit for MELSERVO J4 Series

The Mitsubishi HK-KT43G1-1-12 is a regenerative resistor converter unit designed for use with the MELSERVO J4 series servo amplifiers. It serves as a functional equivalent to the Mitsubishi MRRB32 regenerative braking resistor. During deceleration or load-overhauling conditions, servo drives generate excess kinetic energy that must be safely dissipated. The HK-KT43G1-1-12 absorbs this regenerative energy and converts it into heat, protecting the servo amplifier's internal bus circuit from overvoltage faults and ensuring reliable, uninterrupted machine operation. This unit is intended for installations where the built-in regenerative capacity of the MR-J4 series drive is insufficient for the application's duty cycle or inertia ratio. Typical applications include machine tools, material-handling equipment, packaging lines, and any motion system that demands frequent or high-energy braking. The unit is a direct replacement in systems originally specified with the MRRB32 resistor module, simplifying maintenance and reducing downtime.