Mitsubishi HK-KT43BG7-1-5 Regenerative Converter Unit for MELSERVO J4 Series

The Mitsubishi HK-KT43BG7-1-5 (HK-KT43BG7-1-5) is a regenerative converter unit designed for use with the Mitsubishi MELSERVO J4 series of servo drives. It provides controlled regenerative braking by dissipating excess energy returned from the motor during deceleration or vertical-axis lowering, helping to protect the servo amplifier from overvoltage faults. This unit has a rated output of 300 W (0.3 kW) and features a built-in 40 Ohm regenerative resistance. It is compatible with both 100 V and 200 V AC supply voltage classes, making it suitable for a range of MELSERVO J4 system configurations. The HK-KT43BG7-1-5 is functionally equivalent to the Mitsubishi MRRB32 regenerative converter, offering a direct replacement option in existing installations. Typical applications include CNC machine tools, packaging machinery, material handling equipment, and other automated systems where servo-driven axes require reliable regenerative energy management.