Yaskawa CDBR-40450D CDBR-4045D 480V 18A Dynamic Braking Unit for AC Drives
Product Overview
The Yaskawa CDBR-40450D is a 480 VAC-class dynamic braking transistor module for industrial variable-frequency drive systems. It is also commonly searched as CDBR-4045D, but CDBR-40450D is the complete current model designation.
During motor deceleration or operation with an overhauling load, regenerated energy can increase the DC bus voltage of the drive. The CDBR-40450D switches this energy into a correctly selected external braking resistor to improve stopping performance and reduce DC bus overvoltage trips.
This product is a braking transistor module rather than a braking resistor. The required resistor, thermal protection and associated wiring must be selected separately for the installed drive and braking cycle.
Main Features
- 480 VAC-class dynamic braking module.
- Operating DC bus range from 460 to 800 VDC peak.
- Rated discharge current of 18 Arms.
- Peak discharge current of 60 A based on 10 percent duty and a maximum 10-second operating period.
- Minimum connectable resistance of 13.4 ohm.
- Compact IP20 enclosure for control-panel installation.
- External braking resistor connection for controlled regenerative-energy dissipation.
- Useful for rapid deceleration and overhauling-load applications.
Technical Specifications
| Manufacturer | Yaskawa Electric |
| Series | CDBR-D |
| Complete Model | CDBR-40450D |
| Common Short Model | CDBR-4045D |
| Product Type | Dynamic Braking Transistor Module |
| Voltage Rating | 480 VAC Class |
| DC Bus Range | 460 to 800 VDC Peak |
| Rated Current | 18 Arms |
| Peak Current | 60 A |
| Duty Reference | 10 Percent Duty; Maximum 10 Seconds |
| Minimum Connectable Resistance | 13.4 Ohm |
| Heat Loss | 36 W |
| Enclosure Rating | IP20 |
| Dimensions | 150 x 120 x 157 mm |
| Approximate Net Weight | 2.0 kg |
| External Braking Resistor | Required and Sold Separately Unless Specified |
Compatible System and Applications
The CDBR-40450D is intended for compatible industrial AC drives with an external dynamic-braking-module connection. Compatibility cannot be determined only by the drive voltage or motor kilowatt rating. The complete drive model, DC bus arrangement, required stopping time, load inertia and braking frequency must be checked.
Typical applications include cranes, hoists, conveyors, centrifuges, winders, unwinders, machine tools, test stands, material-handling equipment and machines requiring controlled rapid deceleration.
Maintenance and Replacement Notes
Confirm the complete model CDBR-40450D, even when the existing documentation or market listing uses CDBR-4045D. Verify the DC bus voltage, drive terminals, resistor resistance, resistor power rating, duty cycle, thermal protection and enclosure ventilation before installation.
The minimum connectable resistance must not be treated as the automatically recommended resistor value. The final resistance and wattage must be calculated for the drive capacity and mechanical braking cycle.
CDBR-4045B is the corresponding previous-generation 18 A unit. CDBR-40450D may be considered during an upgrade, but it should not be treated as a plug-and-play replacement without checking mounting dimensions, terminals, control wiring and resistor configuration.
Related Models
Related models include CDBR-40300D for 15 Arms, CDBR-40900D for 30 Arms, CDBR-42200D for 80 Arms and the previous-generation CDBR-4045B.
Inquiry and Supply Notes
Please provide the complete drive model, CDBR nameplate, braking resistor model, resistance and wattage, DC bus connection diagram and required deceleration cycle. Confirm whether the quotation must include only the braking module or a complete braking module and resistor package.
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