Description

The S203-C20 miniature circuit breaker from ABB’s System pro M compact S200 series delivers reliable three-phase circuit protection for both commercial and industrial environments. It combines a delayed thermal tripping mechanism for overload protection with an electromechanical tripping mechanism for short-circuit faults, ensuring complete circuit safety. With a Type C tripping curve, the S203-C20 is ideal for circuits with moderate inrush currents, such as HVAC systems, lighting, and motor-driven applications. Its compact three-pole modular design enables full phase isolation and efficient DIN-rail installation, while optional bottom-fitting auxiliary contacts can save up to 50% panel space. For professional-grade system integration, it can be used within our industrial panel fabrication solutions.

Key Specifications – Miniature Circuit Breaker S203-C20

• Model: S203-C20

• Rated Current: 20 A

• Tripping Characteristic: Type C

• Rated Voltage: 230/400 V AC

• Breaking Capacity: 6 kA

• Poles: 3P (Three-Pole)

• Tripping Mechanisms:

  • Thermal: Overload protection

  • Electromechanical: Short-circuit protection

• Standards Compliance: IEC/EN 60898-1, IEC/EN 60947-2, UL1077

• Mounting: DIN-rail modular system

• Configurations: 1P, 1P+N, 2P, 3P, 3P+N, 4P

• Operating Temperature: -25°C to +55°C

Highlights

• Dual tripping mechanism ensures fast and precise fault protection

• Type C curve suitable for moderate inrush current applications

• Compact modular design with current-limiting performance

• Three-pole configuration provides complete phase isolation

• Compatible with auxiliary and signaling contact accessories

Typical Uses

• Three-phase electrical systems in industrial facilities

• Lighting, HVAC, and power distribution networks

• Machinery, control, and automation panels

• Residential and commercial sub-distribution boards

Installation & Support

The S203-C20 supports fast, tool-free DIN-rail mounting for easy installation.

• Supports auxiliary and signaling modules

• Supplied with detailed wiring and installation documentation

• Supported by ABB’s technical service and global spare parts availability