ABB S203-C16 miniature circuit breaker

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1. Product Overview

The ABB S203-C16 is a three-pole miniature circuit breaker (MCB) designed to provide reliable protection against overload and short-circuit conditions in electrical circuits. It belongs to ABB’s System pro M compact series, known for its high performance, modular design, and compliance with international safety standards.
This breaker is typically used in industrial automation systems, control cabinets, and general power distribution applications.

2. Technical Specifications

3. Product Features and Advantages

• C-curve tripping characteristic — suitable for protecting circuits with moderate inrush currents such as motors, lighting, and inductive loads.

• High breaking capacity — capable of safely interrupting short-circuit currents up to 6 kA.

• Compact modular design — saves space and allows easy installation on standard DIN rails.

• High endurance — long mechanical and electrical lifespan ensures low maintenance.

• Consistent performance — stable operation even in demanding industrial environments.

• Flexible wiring options — compatible with both busbar and cable connections.

• International compliance — meets IEC and UL standards for global applications.

4. Typical Applications

The ABB S203-C16 is widely used in both industrial and commercial systems, including:

• Industrial control panels and distribution boards

• Building and infrastructure power systems

• Machine tools, automation, and production equipment

• Lighting circuits and HVAC systems

• PLC and DCS control systems

• General-purpose electrical distribution for machinery and workshops

5. Installation and Safety Precautions

1. Rated Current Selection
   Ensure the MCB’s rated current (16 A) is appropriate for the circuit load and not exceeded under normal operation.

2. Circuit Characteristics
   Type C MCBs are suitable for general circuits with moderate inrush current; for higher inrush loads, consider a Type D curve.

3. Breaking Capacity
   Verify that the circuit’s prospective short-circuit current does not exceed the 6 kA breaking capacity.

4. Proper Mounting
   Install vertically on a DIN rail with adequate spacing for cooling and easy access.

5. Wiring and Connection
   Use conductors of proper cross-section and ensure terminals are firmly tightened to prevent overheating.

6. Environmental Conditions
   Avoid excessive moisture, dust, vibration, or corrosive atmospheres to maintain reliable operation.

7. Regular Maintenance
   Periodically inspect the MCB for signs of wear, discoloration, or loose terminals; replace if mechanical damage is observed.

8. Compatibility
   When replacing existing breakers, confirm mechanical fit and electrical ratings are identical or approved equivalents.

The structure and details of the product：

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