ABB S203-B63 Miniature Circuit Breaker

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• 1. Product Overview

  The ABB S203-B63 is a three-pole miniature circuit breaker (MCB) designed for overload and short-circuit protection in low-voltage distribution systems. Its B-type tripping characteristic is suitable for general industrial, commercial, and residential circuits, protecting wiring and equipment from overloads and short circuits. The S203 series offers high reliability, compact design, and easy installation, ideal for distribution boards and control panels.

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  2. Technical Specifications

  Parameter	Description
  Model	S203-B63
  Type	Miniature Circuit Breaker (MCB)
  Poles	3P (Three-pole)
  Rated Current	63 A
  Tripping Characteristic	B Type (standard protection for general circuits)
  Rated Voltage	230/400 V AC
  Rated Frequency	50/60 Hz
  Breaking Capacity	10 kA (short-circuit)
  Mounting	35 mm DIN rail
  Housing Material	Flame-retardant plastic
  Protection	IP20
  Standards	IEC/EN 60898-1
  Features	Overload and short-circuit protection, stable and reliable, easy installation

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  3. Key Advantages & Features

  1. Reliable Protection

     • Provides stable overload and short-circuit protection for wiring and devices.

  2. Compact Design

     • Saves space in distribution boards and allows multiple breakers to be installed side-by-side.

  3. Standard B-Type Tripping

     • Suitable for most industrial, commercial, and residential applications.

  4. Easy Installation and Maintenance

     • Modular design with DIN rail mounting for quick installation and easy maintenance.

  5. International Standard Compliance

     • IEC/EN 60898-1 certified for global usage.

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  4. Typical Applications

  • Industrial distribution and control panel protection

  • Commercial low-voltage distribution systems

  • Residential electrical circuit protection

  • Motor and small equipment protection

  • Lighting circuits and general loads

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  5. Usage Precautions

  • Rated Current Selection: Choose the correct current rating according to load to avoid nuisance tripping or insufficient protection.

  • Installation: Ensure DIN rail or distribution board mounting complies with IEC/EN standards.

  • Environmental Conditions: Avoid high temperature, humidity, dust, and corrosive environments.

  • Maintenance: Regularly inspect the breaker and terminals to ensure proper operation.

  • Usage Limitations: Only for AC low-voltage systems; not suitable for DC or extremely high short-circuit currents.

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The structure and details of the product：

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