ABB S203-C32 miniature circuit breaker

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1. Product Overview

The ABB S203-C32 is a three-pole miniature circuit breaker (MCB) designed for efficient protection of electrical circuits against overloads and short circuits. It belongs to ABB’s System pro M compact series and is widely used in industrial control panels, distribution boards, and building automation systems.

2. Technical Specifications

3. Product Features and Advantages

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

• High breaking capacity — ensures safe disconnection under fault conditions.

• Compact modular design — suitable for DIN-rail mounting in control panels and switchboards.

• Wide compliance — meets international standards, compatible with global industrial and building systems.

• Stable and reliable performance — low internal power loss and consistent operation over long periods.

• Ease of installation and maintenance — simple wiring and modular replacement design.

4. Typical Applications

• Industrial control cabinets and distribution panels

• Machine tools and automation equipment

• Motor control circuits and branch protection

• Commercial and residential power distribution systems

• PLC and process control system protection

5. Notes and Precautions

1. Current rating selection
   Choose an MCB with a rated current equal to or slightly higher than the maximum load current, with proper safety margin.

2. Tripping curve
   Type C curve is suitable for circuits with moderate inrush current; for heavy starting loads, Type D may be more appropriate.

3. Breaking capacity
   Ensure the MCB’s short-circuit breaking capacity is greater than the maximum possible fault current of the circuit.

4. Installation and spacing
   Provide adequate spacing for heat dissipation; avoid installation in high-temperature environments.

5. Wiring requirements
   Use appropriately sized conductors and ensure terminal screws are properly tightened to prevent overheating.

6. Environmental conditions
   Avoid excessive humidity, dust, or vibration that may affect performance and service life.

7. Regular inspection
   Periodically check for signs of wear, loose terminals, or insulation degradation.

8. Replacement compatibility
   When replacing an old model, verify that the new MCB matches the system’s electrical and mechanical specifications.

The structure and details of the product：

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