Catalogue reference. Availability, exact specification and OEM or aftermarket supply are confirmed in your quotation.
CDBR-4045B — The Yaskawa CDBR-4045B is a dynamic braking transistor unit designed for 400V class variable frequency drives to manage regenerative energy during motor deceleration. When a…
Sensors & automationPart number: CDBR-4045B
The Yaskawa CDBR-4045B is a 400 V-class dynamic braking transistor unit for AC drive systems. It works with an external braking resistor to dissipate regenerative energy during motor deceleration. Its rated discharge current is 18 A, with a 60 A peak rating subject to the specified duty limit. Confirm drive, resistor and application details before ordering.
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Technical specifications
| Manufacturer | Yaskawa |
|---|---|
| Part number | CDBR-4045B |
| Category | Sensors & automation |
| Item Type Name | Dynamic braking unit |
| Product Family / Series | CDBR-B series |
| voltage_class | 400 V class; 380–460 V AC drive system |
| motor_capacity | 45 kW (60 hp), reference application with one unit under defined braking conditions |
| input_voltage_range | 510-660 V DC |
| max_discharge_current_peak | 60 A peak; below 10% ED, maximum 10 seconds |
| rated_discharge_current | 18 A |
| power_supply_voltage_options | 380V, 400V, 415V, 440V, 460V AC |
| enclosure_rating | IP20 |
| mounting_holes | 4 x M4 |
| Weight | 2.19 kg (4.82 lbs) |
| Dimensions | 140 x 150 x 138.5 mm (W x H x D) |
| Reference status | Published part reference; specification and fitment require confirmation |
| Availability | On request |
| Heat loss | 59 W |
| Braking start voltage settings | 630, 660, 690, 730 or 760 V DC |
Catalogue information may contain errors or be out of date. Full specifications and verified details are available on request. Confirm the part number and equipment fitment with us before ordering.
Product questions
What does the Yaskawa CDBR-4045B braking unit do, and does it need a resistor?
The CDBR-4045B is a dynamic braking transistor unit. It works with an external braking resistor to dissipate regenerative energy during motor deceleration. A correctly selected resistor and thermal protection are needed; the unit is not itself a braking resistor.
What are the CDBR-4045B discharge current and duty ratings?
The unit is rated at 18 A discharge current and 60 A peak discharge current. The stated duty basis is below 10% ED, with a maximum of 10 seconds; the peak rating is not a continuous-current rating.
Will the CDBR-4045B work with my drive and motor?
The unit is intended for 400 V-class drive systems. A legacy selection table associates one unit with a 45 kW (60 hp) motor under defined braking conditions, not every application of that size. Provide the complete drive model and serial number, existing brake unit nameplate, resistor details and braking duty to verify suitability.
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Research information may be outdated. Confirm fitment and specifications with our team before ordering.