ABB S503-X Miniature Circuit Breaker

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1. Product Overview

The ABB S503-X miniature circuit breaker is a 3-pole protective device belonging to the System pro M family. It is designed for overload and short-circuit protection in low-voltage distribution systems. With its compact structure, high breaking capacity, and reliable performance, it is suitable for industrial, commercial, and residential power protection applications.

2. Main Technical Specifications

• Model: S503-X

• Number of Poles: 3P

• Rated Current (In): 1 A – 63 A (depending on configuration)

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

• Rated Insulation Voltage (Ui): 500 V

• Rated Impulse Withstand Voltage (Uimp): 4 kV

• Breaking Capacity (Icu): 6 kA / 10 kA

• Trip Curve: B, C, or D curve

• Frequency: 50/60 Hz

• Mechanical Life: ≥ 20,000 operations

• Electrical Life: ≥ 10,000 operations

• Mounting: 35 mm DIN rail

• Wiring Capacity: 1–25 mm² Cu wire

• Protection Class: IP20 (terminal protection)

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

• Compatible Accessories: Auxiliary contacts, alarm contacts, shunt trip, undervoltage release, etc.

3. Advantages and Features

1. High Breaking Capacity

• Suitable for a wide range of short-circuit levels, providing reliable system protection.

2. Accurate and Reliable Tripping

• B/C/D trip curves cover lighting loads, resistive loads, and motor loads.

• High tripping precision ensures dependable protection.

3. Easy Installation and Maintenance

• Standard DIN-rail mounting allows fast replacement and expansion.

• Large terminals ensure secure and convenient wiring.

4. High Safety Level

• IP20 terminal protection prevents accidental contact.

• Clear status indication simplifies inspection.

5. Strong Modularity

• Supports multiple accessories for advanced control requirements.

4. Application Areas

The ABB S503-X is widely used in:

• Low-voltage distribution protection

• Industrial control panels and PLC systems

• Commercial and residential buildings

• Lighting circuit protection

• Machinery and motor branch protection

• Data centers and server rooms

• HVAC systems, pumps, fans, compressors

5. Precautions

1. Choose the correct trip curve (B/C/D) according to the load type.

2. Ensure terminals are properly tightened to prevent overheating.

3. Apply derating for high-temperature environments.

4. Do not exceed rated current or breaking capacity.

5. Follow correct wiring direction to ensure proper protection.

6. Inspect periodically and replace if abnormal tripping occurs.

7. Not suitable for DC applications unless using DC-specific models.