ABB S203M-K63UC Miniature Circuit Breaker

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• 1. Product Overview

  The ABB S203M‑K63UC Miniature Circuit Breaker (MCB) belongs to the ABB System Pro M Compact S200 range. It features thermal-magnetic trip mechanisms to protect electrical circuits from overload and short-circuit. This C‑curve, 63 A 3‑pole breaker is suitable for moderate inrush current loads such as small motors, lighting, and socket circuits. Compact and easy to install, it is ideal for residential, commercial, and light industrial distribution systems.

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  2. Technical Specifications

  • Model: S203M‑K63UC

  • ABB Part Number: 2CDS253001R0630

  • Product Type: Miniature Circuit Breaker (MCB)

  • Poles: 3P (Three Poles)

  • Rated Current (In): 63 A

  • Tripping Characteristic: C Curve

  • Rated Operational Voltage (Ue): 230/400 V AC

  • Rated Insulation Voltage (Ui): approx. 500 V AC

  • Breaking Capacity: 10 kA (IEC/EN 60898‑1)

  • Mounting: DIN Rail

  • Operating Temperature: ‑25 °C to +55 °C

  • Protection Degree: IP20

  • Standards: IEC/EN 60898‑1, IEC/EN 60947‑2

  • Dimensions: approx. 54 mm × 88 mm × 70 mm

  • Weight: approx. 0.35 kg

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  3. Key Advantages and Features

  • Dual Protection: Thermal trip for overload, magnetic trip for short-circuit

  • C‑Curve Characteristic: Suitable for moderate inrush current loads

  • Compact 3-Pole Design: Saves space in distribution panels

  • High Breaking Capacity: 10 kA for safe operation

  • Easy Installation: Standard DIN rail mounting for quick installation and maintenance

  • Clear Status Indication: Toggle handle shows ON/OFF position

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  4. Typical Applications

  • Residential, office, and commercial distribution systems

  • Industrial and light industrial distribution panels

  • Lighting, socket circuits, and small motor protection

  • Automation control panels and equipment protection

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  5. Installation and Usage Notes

  • Verify breaker rating matches the circuit load

  • Ensure power is off before installation or wiring

  • Do not exceed rated breaking capacity to ensure proper short-circuit protection

  • Install in dry, ventilated environments free of dust and moisture

  • Regularly inspect terminals and breaker contacts for long-term reliable operation

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The structure and details of the product：

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