ABB SAFUR90F575 68759226 brake resistor

1. Product Overview

Model: SAFUR 90F575
Part Number: 68759226
Product Type: Braking resistor / braking unit
Manufacturer: ABB

The ABB SAFUR 90F575 is an industrial-grade braking resistor designed to safely absorb regenerative energy generated during the deceleration or braking phase of motor drives. By dissipating this excess energy as heat, it prevents DC bus overvoltage and ensures reliable braking performance in variable frequency drive (VFD) systems.

This model is commonly paired with ABB brake choppers or braking units in medium to high-power drive systems.

2. Technical Specifications

3. Key Features and Advantages

1. High Power Dissipation Capacity
   Capable of handling substantial regenerative energy during rapid motor deceleration or stop cycles.

2. Robust Industrial Design
   Designed for continuous-duty operation in demanding environments with high durability and reliability.

3. Full Compatibility with ABB Drive Systems
   Optimized for use with ABB inverters and braking choppers, ensuring seamless system integration.

4. Efficient Heat Management
   Large surface area and thermal mass ensure stable operation during repetitive braking cycles.

5. High Safety and Reliability
   Designed with solid insulation and protection against overheating, ensuring long-term operational stability.

6. Suitable for Medium and High Power Applications
   The 90 kW power class enables use in large industrial machines and heavy-duty motor control systems.

4. Typical Applications

• Variable frequency drive (VFD) motor systems requiring fast braking

• Cranes, hoists, elevators, and conveyor systems

• Large fans, pumps, and winders with frequent start/stop cycles

• Energy recovery and braking systems in automation equipment

• ABB drive systems with braking choppers for DC bus voltage control

• Any industrial setup requiring safe dissipation of regenerative energy

5. Installation and Safety Guidelines

1. Parameter Verification

   • Always confirm the resistor value (Ω), rated power, and voltage rating with ABB documentation before installation.

   • Ensure electrical and thermal compatibility with the drive and braking chopper.

2. Cooling and Ventilation

   • The resistor generates significant heat during braking; provide adequate airflow or forced ventilation.

   • Maintain clear space around the unit for effective heat dissipation and prevent overheating.

3. Wiring and Connections

   • Use properly rated cables and secure terminals for high current flow.

   • Keep wiring as short as possible to reduce voltage drops and EMI.

   • Ensure proper grounding and shielding to minimize electrical noise.

4. Protection and Monitoring

   • Incorporate temperature monitoring or thermal switches to prevent overheating.

   • Include overcurrent or surge protection where applicable.

5. Insulation and Safety Clearance

   • Maintain sufficient creepage and clearance distances in high-voltage environments.

   • Protect the resistor surface from accidental contact — install safety covers if necessary.

6. Mounting and Vibration Resistance

   • Secure the resistor on a rigid frame capable of supporting its weight (approx. 17 kg).

   • Regularly check for loose bolts or vibration-induced wear.

7. Operational Life and Maintenance

   • Avoid continuous operation near the rated power limit to extend service life.

   • Periodically inspect the resistance value, temperature rise, and insulation condition.

8. Spare Parts and Redundancy

   • As a critical braking component, consider stocking spare resistor units to minimize downtime.

   • Ensure replacements match the original ABB specifications for safety and performance.

The structure and details of the product：

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