Mitsubishi HK-KT43BG1-1-20 Regenerative Resistor Unit for MELSERVO J4 Series

The Mitsubishi HK-KT43BG1-1-20 is a regenerative resistor converter unit designed for use with the Mitsubishi Electric MELSERVO J4 servo drive series. This unit provides effective regenerative energy dissipation, absorbing excess energy generated during deceleration or braking of servo motors and converting it into heat through its built-in resistor element. It features a rated output of 1,300 watts (1.3 kW), a resistance of 4 Ohm, and operates on a 400-volt AC supply voltage. The HK-KT43BG1-1-20 is functionally equivalent to the Mitsubishi MRRB1374, making it a suitable replacement in systems that originally specify that part number. This regenerative resistor unit is essential in servo-driven applications where frequent acceleration and deceleration cycles occur, helping to protect the servo amplifier from overvoltage conditions caused by regenerative energy. It is typically used in automated manufacturing equipment, CNC machinery, and other motion control systems that employ MELSERVO J4 series servo drives operating on 400 VAC power supplies.