Product Description

Overview

The ABB CBI20 (3BDH000730R1) is a high-performance miniature circuit breaker engineered for demanding industrial and railway power systems. It provides reliable protection against short circuits and overloads. Its compact, modular design is DIN-rail mountable and supports single-pole to four-pole configurations. The breaker combines high interrupting capacity with precise selective tripping to ensure system safety and continuous operation.

Key Performance Features

High Interrupting Capacity

• Handles fault currents up to 20kA (depending on voltage and configuration)

• Protects downstream equipment during severe short circuits

Selective Tripping

• Ensures excellent circuit selectivity

• Only the breaker closest to the fault trips, avoiding full system shutdown

Trip Curve Options

• B / C Curves: General lighting and power loads

• D / K Curves: High inrush currents for motors and transformers

• Z Curve: Sensitive electronic equipment protection

Environmental Resilience

• Operating Temperature: -25°C to +60°C

• Shock & Vibration Resistance: Compliant with EN 61373 (railway standard)

• Suitable for moving machinery and vibration-prone environments

Technical Specifications

Applications

• Power generation plants and distribution systems

• Industrial automation production lines

• Railway vehicles and traction power systems

• High-reliability control panels and power distribution units

FAQ

Q: Can this breaker handle motor startup inrush currents?
A: Yes, D or K curve versions are suitable for high inrush currents.

Q: Is it suitable for railway vibration environments?
A: Yes, it meets EN 61373 vibration resistance standards.

Q: Can it be used in DC systems?
A: Yes, it supports high-voltage DC systems; selection should match voltage and configuration.