ABB NBRA Series Brake Chopper Units NBRA-659

Name: ABB NBRA Series Brake Chopper Units NBRA-659
Brand: ABB

Model: NBRA-659

Brand ABB

Series NBRA-659

Model NBRA-659

RFQ-ready model route Obsolete and surplus sourcing Export follow-up by model list

Product Overview

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Commercial Path

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Technical Dossier

Product Details And Specifications

ABB NBRA Series Technical Notes

The Evolution of NBRA Series Architecture

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

The NBRA-659 represents the mature generation of this series, rated for higher continuous braking current and compatible with both ACS800 and ACS880 drive families when paired with appropriate braking resistors. Units in this series are now in the mature-to-end-of-life phase of their product lifecycle. ABB has transitioned newer installations toward integrated brake chopper options embedded within the ACS880 drive cabinet, reducing the need for external NBRA units in greenfield projects. However, the installed base of NBRA-equipped drives in brownfield facilities remains substantial, and replacement demand for maintenance and emergency repair continues at high volume. Compatibility between NBRA generations is not guaranteed; bus connector pinouts and control signal interfaces differ between NBRA-655/656 and NBRA-658/659 variants.

NBRA Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented NBRA series product range. Units are classified by function and power rating. All models interface with the drive DC bus and require an external braking resistor sized to the application.

Brake Chopper Units — Standard Air-Cooled:

NBRA-655: Brake chopper, 400 V class, low current rating, ACS600 compatible
NBRA-656: Brake chopper, 400 V class, mid current rating, ACS600/ACS800 compatible
NBRA-657: Brake chopper, 400 V class, increased duty cycle rating, ACS800 series
NBRA-658: Brake chopper, 400 V class, high continuous braking current, ACS800
NBRA-659: Brake chopper, 400 V class, highest air-cooled current rating in series, ACS800/ACS880
NBRA-662: Brake chopper, 690 V class, low current rating, ACS800 high-voltage variant
NBRA-663: Brake chopper, 690 V class, mid current rating, ACS800/ACS880 HV
NBRA-664: Brake chopper, 690 V class, high current rating, ACS880 HV compatible
NBRA-665: Brake chopper, 690 V class, extended duty cycle, industrial crane/hoist applications

Liquid-Cooled Brake Chopper Units:

NBRA-671: Liquid-cooled brake chopper, 400 V class, compact cabinet integration
NBRA-672: Liquid-cooled brake chopper, 400 V class, high power density, marine/offshore
NBRA-673: Liquid-cooled brake chopper, 690 V class, high-voltage marine drives

Accessory and Interface Modules:

NBRA-01: Parallel connection kit for NBRA units, enables multi-unit braking capacity expansion
NBRA-02: Termination and bus bar connection kit for NBRA-658/659 cabinet mounting
NBRA-03: Status and fault signal interface board for NBRA series remote monitoring integration
NBRA-04: Braking resistor thermal protection relay interface module

Sourcing Hard-to-Find & Obsolete NBRA Series Parts

Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.

Quality Control for the NBRA Series Range

NBRA series units present specific test challenges due to their high-voltage DC bus interface and IGBT-based chopper topology. DriveKNMS applies the following test protocol to all NBRA units processed through its facility:

DC bus insulation resistance test at 1000 VDC (Megger test) across all power terminals to chassis ground, minimum acceptance threshold 100 MΩ
IGBT chopper transistor static characterization: gate threshold voltage, on-state collector-emitter voltage, and leakage current measurement
Gate driver circuit functional test: verification of gate pulse timing, dead-time insertion, and fault latch behavior under simulated overcurrent condition
Chopper threshold voltage calibration verification: confirmation that the unit activates at the correct DC bus overvoltage setpoint (typically 780 VDC for 400 V class units)
Thermal imaging under load: unit operated at 50% rated braking current for 10 minutes; infrared scan performed to identify hot spots on IGBT modules, bus bars, and gate driver PCBs
Control signal interface test: fault output relay continuity and signal level verification for integration with drive control board
Final functional test: unit connected to a calibrated DC bus simulator and braking resistor load bank; full braking cycle executed at rated current

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