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
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Model: S203-C20 
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Rated Current: 20 A 
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Tripping Characteristic: Type C 
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Rated Voltage: 230/400 V AC 
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Breaking Capacity: 6 kA 
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Poles: 3P (Three-Pole) 
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Tripping Mechanisms: - 
Thermal: Overload protection 
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Electromechanical: Short-circuit protection 
 
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Standards Compliance: IEC/EN 60898-1, IEC/EN 60947-2, UL1077 
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Mounting: DIN-rail modular system 
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Configurations: 1P, 1P+N, 2P, 3P, 3P+N, 4P 
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Operating Temperature: -25°C to +55°C 
Highlights
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Dual tripping mechanism ensures fast and precise fault protection 
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Type C curve suitable for moderate inrush current applications 
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Compact modular design with current-limiting performance 
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Three-pole configuration provides complete phase isolation 
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Compatible with auxiliary and signaling contact accessories 
Typical Uses
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Three-phase electrical systems in industrial facilities 
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Lighting, HVAC, and power distribution networks 
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Machinery, control, and automation panels 
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Residential and commercial sub-distribution boards 
Installation & Support
The S203-C20 supports fast, tool-free DIN-rail mounting for easy installation.
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Supports auxiliary and signaling modules 
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Supplied with detailed wiring and installation documentation 
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Supported by ABB’s technical service and global spare parts availability 
 
					 
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