Dynamic Brake Modules

Enicstra stocks dynamic brake modules and brake resistors used to dissipate regenerative energy from VFD and servo drives during deceleration of inertial loads. When a motor decelerates faster than its natural coast, kinetic energy returns through the drive as bus voltage rise; the dynamic brake module switches a resistor across the DC bus to dissipate that energy as heat, preventing drive over-voltage faults and maintaining controlled deceleration.

Brands carried include Allen-Bradley 1336 and PowerFlex brake modules and DBR resistors, Yaskawa CDBR brake transistor modules and resistor banks, Mitsubishi FR-BU2 brake units, ABB NBRA and SACE brake choppers, Siemens 6SE7090 brake choppers and 6SL3000 resistor units, Lenze EVD brake units, and Bosch Rexroth HMV brake choppers. Obsolete dynamic brake modules — discontinued 1336 codes, retired CDBR early generations, end-of-life FR-BU first variants — are sourced through our supplier network. Each unit is bench-tested for chopper switching and ships with a 12-month functional warranty.

For an obsolete dynamic brake module or resistor, send the OEM part number for a quote within 1–2 business days.

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Dynamic Brake Modules

Yaskawa CDBR-4030B Dynamic Braking Unit and Transistor Module

MFR #: CDBR-4030B

$726.63/ea ✓ Available

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Yaskawa CDBR-4030D Dynamic Braking Unit and Transistor Module

MFR #: CDBR-4030D

$726.63/ea ✓ Available

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Yaskawa CDBR-4045B Dynamic Braking Unit and Transistor Module

MFR #: CDBR-4045B

$2,337.00/ea ✓ Available

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Yaskawa CDBR-4045D Dynamic Braking Unit and Transistor Module

MFR #: CDBR-4045D

$806.55/ea ✓ Available

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Yaskawa CDBR-4220D Dynamic Braking Unit and Transistor Module

MFR #: CDBR-4220D

$2,694.20/ea ✓ Available

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Buying guide

Choosing Dynamic Brake Modules components

Dynamic brake selection is more about sizing than choosing — the brake unit and resistor must handle the application's regenerative energy and duty cycle without overheating, and the resistance value must match what the drive's chopper expects. Undersized brakes overheat and fault; oversized brakes are unnecessary cost.

Specs to confirm before ordering:

Brake module catalog number matched to the drive frame and voltage class
Resistor resistance value in ohms — this is a drive-specified value, not a free choice
Resistor power rating in watts and the duty-cycle assumption it is rated for (e.g., 10% duty cycle continuous regen vs. 100% peak for short bursts)
Brake transistor / chopper voltage rating — must match the DC bus voltage of the drive (typically 750 V for 480 V drives, 375 V for 240 V drives)
Continuous and peak current rating of the chopper
External vs. internal mounting — small drives have internal brake transistors that need only an external resistor; larger drives need separate brake modules
Resistor element: wire-wound (typical for service), aluminum-housed (compact), grid resistor (large industrial)
Thermal-overload sensing — bimetal switch or PT100 in the resistor for over-temperature feedback to the drive
Mounting: panel-mount, free-air mount (with clearances), or NEMA-rated enclosure

Common gotchas: the resistance value is set by the drive's internal chopper design — using the wrong ohms either trips the drive over-current (resistance too low) or fails to absorb energy fast enough (resistance too high). Brake resistors get hot during operation — even at rated duty cycle, surface temperatures can exceed 200 °C, and they must be mounted with the OEM-specified clearances away from cabling and combustible materials. The "duty cycle" rating is application-dependent; an application that regens 20% of cycle time needs a brake rated for at least that duty cycle, not just peak watts. Without thermal overload sensing wired to the drive, an overheating resistor is not detected and can damage adjacent equipment.

Typical applications: hoist and crane decel control on high-inertia drum loads, centrifuge spin-down, large fan or pump decel, decel of long horizontal conveyors with significant inertia, and servo motion in pick-and-place where rapid stop is required.

For obsolete dynamic brake modules and resistors, send the OEM part number for a sourcing quote.

Related categories Frequently asked questions

Do you stock obsolete brake modules and resistors?

Yes. Discontinued Allen-Bradley 1336 brake codes, retired Yaskawa CDBR early generations, end-of-life Mitsubishi FR-BU, and earlier ABB NBRA are sourced through our supplier network.

Can I undersize the brake resistor and "see what happens"?

No. Under-rated resistors overheat and fail, sometimes catastrophically. The wattage and duty cycle must match the actual regenerative load. Size from the application's regen-energy calculation, not by guessing.

How do I calculate regen power?

Roughly: peak regen power = (motor power) × (decel ratio relative to motor base torque) × (efficiency). For a 10 kW motor decelerating at 2× rated torque for 5 seconds out of every 60-second cycle, peak power ~20 kW for 5 seconds, duty cycle ~8%. Use the OEM regen-sizing tool for precise sizing.

Do small drives need an external brake module?

Small frame drives (typically below 30 kW) have built-in brake transistors and need only an external resistor. Larger frames need a separate brake module plus a resistor. The drive datasheet specifies which.

Why does my resistor get so hot?

Brake resistors dissipate energy as heat — by design. Surface temperatures of 200+ °C at rated duty are normal. Provide the OEM-specified clearance from cables and combustibles, mount on non-combustible surfaces, and use the over-temperature feedback to alarm the drive.

What is the warranty?

12-month functional warranty. Damage from undersizing (resistor over-temperature failure), miswiring, or installation without the OEM-specified clearances is not covered.