Product Overview
The Yaskawa CDBR-4030B is a previous-generation dynamic braking transistor unit for 380 to 460 VAC-class industrial drive systems. It is rated for 15 A discharge current with a maximum peak discharge current of 40 A.
The module operates with an external braking resistor to dissipate regenerated DC bus energy during deceleration. It is not a resistor unit and should not be ordered without confirming the existing resistor and thermal-protection arrangement.
Main Features
- Previous-generation CDBR-B braking transistor unit.
- Designed for 380 to 460 VAC-class industrial drives.
- DC bus operating range from 460 to 800 VDC peak.
- Rated discharge current of 15 A.
- Maximum discharge current of 40 A peak.
- Selectable braking-start voltage for different supply conditions.
- Charge lamp and braking-operation indication.
- Heatsink overtemperature protection and master or slave selection.
Technical Specifications
| Manufacturer | Yaskawa Electric |
| Series | CDBR-B |
| Model | CDBR-4030B |
| Product Type | Dynamic Braking Transistor Unit |
| Product Generation | Previous Generation |
| AC Drive Voltage Range | 380 to 460 VAC |
| DC Bus Range | 460 to 800 VDC Peak |
| Rated Discharge Current | 15 A |
| Maximum Discharge Current | 40 A Peak |
| Duty Reference | Below 10 Percent ED; Maximum 10 Seconds |
| Braking Start Settings | 630 / 660 / 690 / 730 / 760 VDC |
| Reference Motor Output | 40 HP / 30 kW with One Unit in Legacy Selection Table |
| Heat Loss | 54 W |
| Protective Configuration | Wall-Mounted Enclosed Type |
| Approximate Dimensions | 150 x 140 x 138.5 mm |
| Current Upgrade Candidate | CDBR-40300D |
Compatible System and Applications
The CDBR-4030B was designed for compatible previous-generation Yaskawa industrial drives. Confirm the full drive model and wiring diagram because products with the same 400 V voltage class do not automatically use the same braking module.
Typical applications include machine tools, packaging equipment, conveyors, winders, hoists, centrifuges and other machinery requiring shorter stopping times or control of regenerated energy.
Maintenance and Replacement Notes
Before replacing the unit, check the voltage-selection connector, master or slave setting, DC bus terminals, control terminals, resistor value, resistor thermal contact and enclosure ventilation.
The legacy application table associates one CDBR-4030B with a 40 HP or 30 kW drive under specified braking conditions. Higher-capacity arrangements used multiple units, but the quantity must be determined from the approved selection table.
CDBR-40300D is the corresponding current 15 Arms D-series upgrade candidate. It should not be installed as a direct physical replacement until the mounting dimensions, terminal arrangement, control wiring and resistor compatibility have been reviewed.
Related Models
Related models include CDBR-4045B, CDBR-4090B, CDBR-4220B and the newer CDBR-40300D or CDBR-4030D.
Inquiry and Supply Notes
Please provide clear photographs of the nameplate and terminals, the complete inverter model, braking resistor information and the required braking cycle. Availability and product condition must be confirmed for each quotation because CDBR-4030B is a previous-generation model.
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Yaskawa CDBR-4030B 480V 15A Legacy Dynamic Braking Unit for AC Drives Images
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