Product Overview

The Yaskawa CDBR-40300D is a 480 VAC-class dynamic braking transistor module rated at 15 Arms. It is frequently identified in drawings and market listings as CDBR-4030D, while CDBR-40300D is the complete current model number.

The module controls the connection of an external braking resistor to the DC bus when regenerated energy raises the bus voltage during motor deceleration. This helps improve stopping performance and reduce overvoltage faults in suitable variable-frequency drive applications.

Main Features

• 480 VAC-class dynamic braking transistor module.
• Operating DC bus range from 460 to 800 VDC peak.
• Rated current of 15 Arms and peak current of 40 A.
• Current rating based on 10 percent duty and maximum 10-second operation.
• Minimum connectable resistance of 20 ohm.
• Compact IP20 panel-mount enclosure.
• Low specified heat loss of 24 W.
• External resistor design allows system-specific braking selection.

Technical Specifications

Compatible System and Applications

The CDBR-40300D is used with compatible 480 VAC-class industrial drives that provide the required DC bus and braking-module connections. Selection must consider the complete drive model, motor capacity, load inertia, stopping time, starts per hour and external-resistor thermal rating.

Typical applications include packaging machinery, conveyors, machine tools, material-handling systems, winders, test equipment and production machinery requiring controlled deceleration.

Maintenance and Replacement Notes

Confirm both CDBR-40300D and the commonly used CDBR-4030D designation when checking documentation. Verify that the connected braking resistance is not below 20 ohm and that the resistor wattage is sufficient for the real braking duty.

The previous-generation CDBR-4030B has the same nominal 15 A rated and 40 A peak current class. However, the current D model has different physical dimensions and may require changes to mounting, terminals and wiring.

Do not assume that an external resistor is included with the module. Confirm the quotation scope before ordering.

Related Models

Related models include CDBR-40450D, CDBR-40900D, CDBR-42200D and the previous-generation CDBR-4030B.

Inquiry and Supply Notes

Please provide the complete drive model, motor capacity, braking cycle, existing resistor resistance and wattage, and photographs of the installed wiring. These details are necessary to verify the module and resistor combination.