ABB ST202M-C4 Miniature Circuit Breaker

1. Product Overview

The ABB ST202M-C4 is a miniature circuit breaker (MCB) from the ABB ST series, designed to protect low-voltage distribution systems and equipment from overloads and short circuits. It features a C-type trip characteristic, suitable for protecting general loads and small inductive loads such as motors and lighting. The ST202M series offers compact design, easy installation, and high reliability, widely used in industrial, commercial, and residential distribution systems.

2. Technical Specifications

• Model: ST202M-C4

• Series: ST Miniature Circuit Breaker

• Poles: 2-pole

• Trip Characteristic: C-type (suitable for small motors and general loads)

• Rated Current: 4 A

• Rated Voltage: AC 230/400 V

• Breaking Capacity: 6 kA (IEC/EN 60898)

• Pole Coupling: Linked operation

• Mounting: 35 mm DIN rail

• Frequency: 50/60 Hz

• Mechanical Life: > 10,000 operations

• Electrical Life: > 4,000 operations

• Protection Rating: IP20

• Standards: IEC/EN 60898, CE

3. Key Advantages & Features

1. Reliable Protection – Protects circuits and equipment from overloads and short circuits.

2. Quick Response – C-type trip suitable for small motors and general load short-circuit protection.

3. Compact Design – Space-saving for distribution panels, supports modular installation.

4. Easy Operation – Simple switch operation, easy installation and maintenance.

5. High Safety – Linked pole operation prevents single-pole misoperation.

6. Global Standards Compliance – IEC/EN certified for worldwide use.

4. Typical Applications

• Industrial low-voltage distribution systems

• Commercial and office building circuits

• Residential distribution panels

• Small motor and lighting circuit protection

• Automation equipment and control panels

5. Installation & Usage Notes

1. Rated Current Matching – Ensure the MCB rating matches the load to prevent nuisance tripping or under-protection.

2. Installation Environment – Avoid high humidity, dust, or corrosive environments.

3. Operation & Maintenance – Inspect MCB status periodically to ensure proper operation.

4. Secure Wiring – Tighten all terminal screws to ensure reliable contact.

The structure and details of the product： ​

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