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The Fuji BU55-4E Dynamic Braking Unit Kit is an essential accessory for Fuji 400V Variable Frequency Drives (VFDs). This kit is designed to efficiently dissipate the regenerative energy created when an AC motor is rapidly decelerating, ensuring quick and safe stopping of high-inertia loads without triggering VFD overvoltage faults.
The single BU55-4E unit covers two motor ratings (45kW and 55kW), but requires a specific, correctly-sized Braking Resistor (DB) to be selected below for optimal performance.
Key Features
Broad Compatibility: Works seamlessly with Fuji FRENIC-MEGA, FRENIC-ACE, and other 400V VFD series.
Safety and Compliance: Ensures controlled motor stops, protecting your VFD and machinery from damage.
Simple Installation: Designed for easy integration into control panels.
Technical Specifications & Component Pairing
The core BU55-4E unit is the same for both applications, but the resistance value changes to handle the different regenerative energy profiles of the 45kW and 55kW motors.
Option Selection (Kit)
BU Unit Model
Required Resistor Model
Resistance Value (?)
45kW
BU55-4E
DB45-4C
10
55kW
BU55-4E
DB55-4C
7.5
Outline Dimensions (BU Unit and Resistors)
Verify clearances for your control panel using the dimensions below (all measurements in millimeters).
