Essential Motor Braking Solution

The Fuji BU37-4E 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 BU37-4E unit covers two motor ratings (30kW and 37kW), 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 BU37-4E unit is the same for both applications, but the resistance value changes to handle the different regenerative energy profiles of the 30kW and 37kW motors.

Option Selection (Kit)	BU Unit Model	Required Resistor Model	Resistance Value (?)
30kW	BU37-4E	DB30-4C	15
37kW	BU37-4E	DB37-4C	12

Outline Dimensions (BU Unit and Resistors)

Verify clearances for your control panel using the dimensions below (all measurements in millimeters).

Component	Width (mm)	Height (mm)	Depth (mm)	Weight (kg)
Braking Unit (BU37-4E)	150	280	160	4
Resistor (DB30-4C)	100	570	145	11
Resistor (DB37-4C)	100	700	145	14

Downloads

Engineering Tools

Access our range of industry-specific calculators.

Fuji BU37-4E Dynamic Braking Unit Kit (30kW to 37kW, 400V Class)

Have a question?