Mitsubishi FR-BR-H55K Braking Resistor Unit for FREQROL Inverters

The Mitsubishi FR-BR-H55K (FR-BR-H55K) is a high-capacity braking resistor unit designed for use with Mitsubishi Electric FREQROL FR series variable frequency drives and industrial inverter installations. In automation drive setups, the resistor unit connects within dynamic braking and regenerative discharge circuits to safely absorb and dissipate excess electrical energy produced when motors decelerate, stop rapidly, or encounter overhauling loads. By converting regenerative energy into thermal energy, the unit prevents DC bus overvoltage faults on connected FREQROL drives, ensuring smooth deceleration control and protecting sensitive power electronics. Built for demanding industrial environments, the FR-BR-H55K supports reliable thermal management and continuous operational readiness in automated facilities. It is typically deployed alongside compatible FREQROL inverter units and external brake units in applications such as overhead cranes, hoists, material handling conveyors, machine tools, centrifuges, and automated production lines requiring frequent start-stop cycles or rapid braking. The unit integrates into industrial control cabinets and drive panels, contributing to stable drive performance and extended equipment life.