ABB S503-C63 Miniature Circuit Breaker

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1. Product Overview

The ABB S503-C63 Miniature Circuit Breaker is a high-performance protective device for residential, commercial, and light industrial distribution systems. It quickly disconnects the circuit in the event of overload or short circuit, protecting wiring and equipment.

The S503 series features precise overload and short-circuit protection, easy operation, high reliability, and complies with IEC 60898-1 standards. Type C characteristic is suitable for circuits with inductive loads, such as motors and transformers.

2. Technical Specifications

3. Key Features & Advantages

• Fast protection: Quickly responds to overloads and short circuits, protecting circuits and equipment

• Type C trip: Suitable for motors and inductive loads

• Easy operation: Manual switching with clear on/off indication

• High reliability: Mechanical life ≥ 10,000 operations, long electrical life

• Flexible installation: DIN rail mounting, space-saving

• Standard compliant: IEC 60898-1 ensures safety and reliability

4. Typical Applications

• Residential and commercial building distribution systems

• Motor, pump, and fan load protection

• Lighting circuits and socket branch protection

• Small industrial automation equipment

• Main and branch circuit protection in distribution panels and boards

5. Installation & Safety Notes

1. Ensure the rated current matches the circuit load to prevent nuisance trips or damage.

2. Confirm the breaking capacity meets the short-circuit current of the system.

3. Maintain a dry and ventilated environment; avoid dust, moisture, and corrosive conditions.

4. Ensure main and load wiring is properly tightened to prevent poor contact.

5. Regularly inspect breaker condition and appearance for long-term reliability.

6. Type C breakers are suitable for inductive loads such as motors and transformers.

The structure and details of the product：

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