Mitsubishi FR-BU2-H220K Braking Unit for FREQROL Inverters

The Mitsubishi FR-BU2-H220K is an external braking unit designed for integration with Mitsubishi FREQROL series variable frequency drives. Engineered for heavy-duty industrial drive systems, this 400V class unit manages regenerative energy generated during rapid motor deceleration, high-inertia stops, or continuous regenerative cycles. It operates across the inverter DC bus, routing surplus energy away from internal drive circuitry and into compatible external discharge resistors to prevent overvoltage tripping. Rated for drive capacities up to 220 kW, the FR-BU2-H220K provides dependable dynamic braking performance in demanding motion applications. It is commonly implemented across high-inertia automated machinery, overhead cranes, hoists, centrifuges, unwinders, and continuous material processing lines. Built into a robust chassis weighing approximately 10 kg, it ensures stable thermal dissipation and straightforward wiring into industrial control enclosures. The unit safeguards power semiconductors and drive electronics while optimizing deceleration control in critical industrial environments.