The ABB S203 series are compact, modular miniature circuit breakers (MCBs) designed for residential, commercial, and industrial applications, offering rated currents up to 63A and breaking capacities up to 6 kA.

Overview

The S203 series is part of ABB's S200 product range, designed to protect electrical circuits from overload and short-circuit conditions. These devices are suitable for residential, commercial, and industrial installations and comply with international standards including IEC/EN 60898-1, IEC/EN 60947-2, and UL1077 .

Key Features

• Rated Currents: Up to 63A depending on the model .
• Breaking Capacity: Up to 6 kA at 230/400 V AC .
• Pole Configurations: Available in 1P, 1P+N, 2P, 3P, 3P+N, and 4P .
• Tripping Mechanisms:
  • Thermal delayed tripping for overload protection
  • Electromechanical tripping for short-circuit protection
• Characteristics: B, C, D, K, Z curves for different load types .
• Connection Terminals: Patented pressure plate design for safe and easy wiring; supports conductor cross-sections up to 35 mm² .
• Auxiliary Contacts: Bottom-fitting auxiliary contacts can be mounted to save space .
• Compliance: Meets DIN VDE 0100-430, DIN VDE 0100-530, and other international standards .

Model Variants

• S203-B63: B-curve, rated up to 63A, suitable for general-purpose protection .
• S203-D2: D-curve, 2A, designed for circuits with high inrush currents; datasheet available for detailed electrical and mechanical specifications .
• S203-C8: C-curve, 8A, 3-pole, ideal for moderate inductive loads .
• S203-C100: C-curve, 100A, 3-pole, for higher current applications .

Applications

The S203 series is widely used in:

• Residential buildings for lighting and socket circuits
• Commercial installations for small equipment and machinery
• Industrial setups for motor protection and distribution panels

Accessories and Installation

• Compatible with System pro M compact accessories for enhanced functionality
• Can be integrated into modular distribution boards
• Each device undergoes three intensive quality and performance tests before delivery The ABB S203 series provides a reliable, space-saving, and versatile solution for circuit protection, with multiple models and configurations to suit a wide range of electrical installations.