Description
The S203-C50 miniature circuit breaker from ABB’s System pro M compact S200 series delivers reliable three-phase circuit protection across residential, commercial, and industrial applications. Featuring a delayed thermal tripping mechanism for overload protection and an electromechanical trip for short-circuit events, it ensures quick and dependable fault isolation. The Type C tripping curve makes it ideal for circuits with moderate inrush currents such as motors, HVAC, and lighting systems. Its compact 3-pole design allows full phase isolation and easy DIN-rail installation, while optional bottom-fitting auxiliary contacts can reduce panel space usage by up to 50%. For seamless integration, the S203-C50 can be implemented within our industrial panel fabrication solutions to enhance system performance and protection.
Key Specifications – Miniature Circuit Breaker S203-C50
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Model: S203-C50 
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Rated Current: 50 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 precise and fast protection 
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Type C curve suitable for moderate inrush current circuits 
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3-pole configuration provides complete phase isolation 
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Compact modular design with current-limiting capability 
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Compatible with auxiliary and signaling contact modules 
Typical Uses
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Three-phase distribution panels and sub-systems 
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Industrial machinery, HVAC, and lighting circuits 
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Commercial and residential electrical protection 
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Control systems and automation applications 
Installation & Support
The S203-C50 supports quick DIN-rail installation for efficient panel setup.
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Compatible with ABB auxiliary and signaling accessories 
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Supplied with detailed wiring and installation documentation 
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Supported by ABB’s technical service and spare parts network 
 
					 
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