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Breaking Unit
The function of the braking unit is to divert into a braking resistor the regenerative energy produced in the process of decelerating the motor, converting that energy into heat. Regenerative energy flows from the motor into the inverter DC Bus, manifested as increased bus voltage. The advantage gained using the braking unit is improved braking performance and shorter deceleration time of the load.
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The braking unit in the DBU series is applied to consume in the braking resistor the regenerative energy produced in the deceleration process of the motor in the form of heat energy .In this way ,the braking performance of the frequency inverter is improved and the braking time of the frequency inverter  is reduced .

1. Safety: The tripping function of the equipment against IGBT short circuit and breakdown can effectively avoid the hidden danger of fire caused by the breakdown of IGBT and the overload operation of the resistor in a long time.
2. Wide Compatibility :The special design of this braking unit allows for the usage of common resistance rather than the non-inductive resistance .It can be adjusted to adapt to 600V-760V DC chopper wave voltage . Further more, this device is used in various type of medium and low voltage frequency inverter (Specially designed product reaches up to 1200V)
3. Economy: This facility is characterized by high performance cost ratio . With relatively economical price .its quality is same as that of similar imported products. It is therefore considered as the most economical and practical component product for the braking unit of the inverter .
4. A book-type design is employed in this braking unit which can be installed in a parallel connection with zero clearance .It is recommended that it can be connected in parallel  with 3 units at most ..

Outline& Mounting Dimension(Unit:mm)


Mounting Hole Size (mm)

Terminal Screw Size

Wire Size (mm2)









Technical Specifications
Model AC200V-AC300V AC380V~AC460V
2015 2022 2030 4030 4045 4220 4300
Peak current (A) 50 75 90 50 75 300 400
Rated Current(A) 15 25 30 15 25 85 120
Breaking initial voltage 380±5V 630/660/690/730/760V±10V
Maximum Hysteresis
About 8V About 16V
Multiple units Maximum: breaking unit are  parallel connected
Power DC Bus Voltage Range DC 243~400V DC460~800V
Power ON The red "power" LED will be on when the inverter DC Bus voltage is above ~35VDC
Braking ON The green "braking" LED will be on during braking unit  work

Temperature -10C~+40C   ( -10C~+50C for store)
Humidity 90% RH (no dew)
Vibration 1G(10~20HZ), 0.2G ( 20~50HZ)
Protection IP20
Structure Wall mounted
wiring diagram for inverter system
recommended brake assembly matching specification
Inverter Braking Unit Braking resistor
Voltage(V) Motor(KW) Model Quantity(PCS) Recommed resistor value Resisitor specification Quantity(PCS)
220V 0.75KW Built-in 80W200Ω 80W200Ω 1
1.5KW Built-in 200W100Ω 200W100Ω 1
2.2KW Built-in 300W70Ω 300W70Ω 1
3.7KW Built-in 400W40Ω 400W40Ω 1
380V 0.75KW Built-in 80W750Ω 80W750Ω 1
1.5KW Built-in 200W400Ω 200W400Ω 1
2.2KW Built-in 300W250Ω 300W250Ω 1
3.7KW Built-in 400W150Ω 400W150Ω 1
5.5KW Built-in 600W100Ω 600W100Ω 1
7.5KW Built-in 800W75Ω 800W75Ω 1
11KW Built-in 1000W50Ω 1000W50Ω 1
15KW Built-in 1500W40Ω 1500W40Ω 1
18.5KW 4030 1 2500W35Ω 2500W35Ω 1
22KW 4030 1 3000W27.2Ω 3000W27.2Ω 1
30KW 4030 1 5000W19.2Ω 2500W38.4Ω 2
37KW 4045 1 6000W16Ω 2000W48Ω 3
45KW 4045 2 9600W13.6Ω 2500W54.4Ω 4
55KW 4030 2 12000W10Ω 2000W60Ω 6
75KW 4045 2 19200W6.8Ω 2500W54.4Ω 8
Braking Resistor Box Quantity(PCS)
90KW 4030 3 9600W20Ω 3
100KW 4220 1 9600W20Ω 3
132-160KW 4220 1 40KW3.4Ω 1
185-220KW 4220 1 60KW3.2Ω 1
250-315KW 4220 2 40KW4.5Ω 2
315-600KW 4220 3 60KW3Ω 3