ABB SU202M Miniature Circuit Breaker

• 1. Product Overview

  ABB SU202M Miniature Circuit Breaker is a protective device for low-voltage distribution systems, providing overload, short-circuit protection, and circuit isolation.

  It uses thermal-magnetic trip technology to quickly disconnect power in overload or short-circuit conditions, ensuring electrical safety and system stability. The compact design and easy installation make it suitable for residential, commercial, and light industrial low-voltage distribution systems.

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  2. Main Technical Data

  General

  • Product type:
    Miniature Circuit Breaker (MCB)

  • Poles:
    2

  • Rated current In:
    2 A

  • Rated operational voltage:
    230/400 V AC

  • Frequency:
    50/60 Hz

  • Trip characteristic:
    Type B (for general lighting and household circuits)

  Protection Features

  • Overload protection:
    Thermal trip for sustained overload

  • Short-circuit protection:
    Magnetic trip for fast response to short circuits

  • Breaking capacity:
    6 kA (compliant with LV distribution standards)

  Mechanical and Installation

  • Operation:
    Manual ON/OFF

  • Mounting:
    35 mm DIN rail

  • Housing material:
    Flame-retardant high-strength plastic

  • Protection rating:
    IP20 (for panel installation)

  Standards and Certification

  • Standards:
    IEC/EN 60898-1 / GB 10963.1

  • Operating environment:
    Residential, commercial, and light industrial environments

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  3. Key Advantages and Features

  1. Reliable overload and short-circuit protection
     Ensures safe operation of electrical systems and devices.

  2. Compact size and easy installation
     DIN rail mounting saves distribution panel space.

  3. High breaking capacity
     Safely interrupts short-circuit currents, protecting circuits and equipment.

  4. Thermal-magnetic trip design
     Fast response to short-circuits, delayed response to overload, prolonging equipment life.

  5. Flame-retardant industrial housing
     High temperature and mechanical impact resistant, safe and reliable.

  6. International standard compliance
     IEC/EN/GB certified for global applications.

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  4. Typical Applications

  • Residential and apartment low-voltage distribution

  • Commercial building lighting and power systems

  • Light industrial load distribution and control

  • Data centers and office building LV distribution

  • Small equipment and automation control panel protection

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  5. Installation and Application Notes

  1. Verify rated current
     Select MCB current rating according to circuit load.

  2. Correct wiring
     Connect live and neutral wires properly; tighten terminals securely.

  3. Avoid overload operation
     Long-term exceeding rated current may reduce breaker lifespan.

  4. Installation environment
     Avoid moisture, high temperature, and corrosive gases.

  5. Periodic inspection
     Check MCB status and operational reliability regularly.

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The structure and details of the product：

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