Mitsubishi HK-KT43G7-1-21 Regenerative Resistor Unit for MELSERVO J4 Series

The Mitsubishi HK-KT43G7-1-21 is a regenerative resistor converter unit designed for use with the MELSERVO J4 series servo drive systems. It provides controlled dissipation of regenerative energy produced during motor braking and deceleration, protecting the drive from overvoltage conditions and ensuring stable system operation. The unit has a rated output of 500 W (0.5 kW) and a resistance value of 9 Ohm. It is compatible with AC supply voltages of 100 V or 200 V, making it suitable for a range of single-phase and three-phase installations commonly found in MELSERVO J4 configurations. The HK-KT43G7-1-21 is functionally equivalent to the Mitsubishi MRRB5N regenerative brake resistor, allowing it to serve as a direct replacement in existing systems. Typical applications include CNC machine tools, automated assembly lines, packaging equipment, and other motion control setups that rely on MELSERVO J4 servo amplifiers for precise motor control.