ABB S1N125 molded case circuit breaker

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ABB S1N125 Molded Case Circuit Breaker Technical Documentation

Product Description

The ABB S1N125 is a molded case circuit breaker (MCCB) designed for industrial and commercial electrical protection. It belongs to ABB’s Isomax S series, featuring thermal-magnetic trip protection for overload and short-circuit conditions. With a 125A frame current and multiple pole configurations (3P/4P), it is widely used in motor control, power distribution, and circuit protection applications.

Key Features:

• Compact & robust design – Plastic-insulated housing (IP20) for electrical isolation and durability .

• High breaking capacity – Up to 40kA (230V AC) and 25kA (380/415V AC) for reliable fault interruption .

• Versatile mounting – Supports front/rear wiring and DIN rail/fixed installation .

• Multiple trip units – Configurable with thermal-magnetic (TMD), electronic (PR211/PR212), or residual current (RC221-223) trip units .

Technical Specifications

Applications

1. Motor Protection – Safeguards motors from overload and short circuits in industrial automation .

2. Power Distribution – Used in MCCs (Motor Control Centers) and low-voltage switchgear .

3. Building Electrical Systems – Ensures safety in HVAC, lighting, and emergency power circuits .

4. Renewable Energy – Protects solar/wind power inverters and battery storage systems .

Installation & Safety Notes

1. Wiring Guidelines

   • Use shielded cables for noise immunity; maintain ≥50 cm separation from high-voltage lines .

2. Environmental Conditions

   • Avoid conductive dust and humidity >95%; max ambient temp: +70°C.

3. Maintenance

   • Inspect terminals annually for corrosion; test trip functionality every 6 months .

4. Compliance Standards

   • Meets IEC 60947-2, GB 14048.2 for circuit protection .

The structure and details of the product：

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