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ABB NBRA-663 – External Braking Chopper for Industrial Drives
Product Overview
The NBRA-663 is an external braking chopper designed by ABB for high-power industrial drive systems. It works with ACS 600/800 series inverters to handle excess energy generated during motor deceleration or braking. By converting kinetic energy into heat via external resistors, the NBRA-663 prevents DC bus overvoltage trips, ensuring stable operation in cranes, conveyors, and high-inertia applications.
Technical Specifications — NBRA-663
| Parameter | Value |
|---|---|
| Product Model | NBRA-663 |
| Manufacturer | ABB |
| Product Type | External Braking Chopper |
| Power Rating | 14.4 kW (peak), 2 kW (continuous) |
| Voltage | 690 V AC |
| Current | 30 A |
| Resistance | 22 Ohm (min.) |
| Operating Temperature | -10°C to +50°C |
| Mounting | Panel/Enclosure Mount |
| Dimensions (HxWxD) | 250 × 150 × 80 mm |
| Weight | 2.9 kg |
| Interfaces | DC+/DC- Terminals, Enable Input |
| Compliance | CE, UL, RoHS |
ABB NBRA-663
Key Features and Benefits — NBRA-663
- High Power Handling: Supports up to 690 V AC and 30 A, ideal for heavy-duty drives in mining, metals, and material handling.
- Overvoltage Protection: Eliminates inverter trips caused by regenerative energy, improving system reliability during frequent stops.
- Flexible Compatibility: Works with ABB ACS series and third-party inverters with accessible DC bus terminals.
- Compact & Lightweight: Saves cabinet space and simplifies installation in new or retrofitted systems.
- Robust Construction: Built for industrial environments with high vibration and temperature fluctuations.
- Easy Setup: Requires minimal configuration; connects directly to DC bus and external resistors.
Related Models
NBRA-653: 415 V AC braking chopper for low-to-medium power ACS 600 drives.
NBRA-663C: IP54-rated universal chopper for 230–500 V AC, suitable for dusty sites.
NBRA-658: Compact 20 A model for smaller inverters and limited-space installations.
NBRA-669: High-current 40 A version for 690 V AC heavy-duty braking applications.
Installation and Maintenance — NBRA-663
Mount vertically in a well-ventilated cabinet to avoid overheating. Connect DC+/DC- terminals to the inverter’s DC bus and install external resistors with ≥22 Ohm resistance. Use shielded cables and ensure proper grounding to reduce EMI.
Maintenance is minimal. Inspect terminals annually for tightness and check resistors for wear. No routine calibration is needed. The NBRA-663’s durable design ensures long service life with low operational costs.
