ABB SZ201-B20 Miniature Circuit Breaker 1P B 20A 6kA

The ABB SZ201-B20 is a high-quality 1-pole miniature circuit breaker engineered to provide dependable protection for electrical circuits in various environments. This device is specifically designed to detect and interrupt overloads and short circuits, thereby safeguarding electrical wiring and connected equipment from potential damage. With its robust construction and precise engineering, it serves as a critical component in modern electrical distribution systems.

Advantages

This miniature circuit breaker offers exceptional reliability and performance consistency, ensuring that electrical systems remain protected under diverse operating conditions. Its B-curve tripping characteristic makes it particularly effective for applications with low surge currents, providing a balanced approach to circuit safety. The compact design allows for efficient use of space within distribution boards, while the 6kA breaking capacity ensures it can handle significant fault currents safely and effectively.

Suitable for

• Residential electrical installations
• Commercial building distribution boards
• Protection of lighting circuits
• General purpose electrical branch circuits

When it may not be suitable

This circuit breaker is not intended for use in DC electrical systems, as it is specifically designed for AC applications. Furthermore, it may not be appropriate for circuits with high inrush currents, such as those powering large motors or transformers, where a C or D tripping curve would be more suitable.

Key specifications

• Number of poles: 1
• Rated current: 20A
• Tripping characteristic: B-curve
• Breaking capacity: 6kA
• Voltage type: AC

How to use

The device is designed for DIN-rail mounting within a standard electrical distribution enclosure. Installation should be performed by a qualified electrician in accordance with local electrical codes and safety regulations. The breaker is snapped onto the rail and connected to the supply and load conductors using the integrated terminal screws, ensuring all connections are tightened to the specified torque to prevent overheating.

What to consider before purchase

• Verify that the 20A rating matches the requirements of your specific circuit load.
• Ensure the B-curve characteristic is appropriate for the equipment being protected.
• Confirm that the 6kA breaking capacity meets the short-circuit current rating of your electrical installation.
• Check that the mounting space is compatible with a 1-pole DIN-rail device.

Usage recommendations

Regular inspection of the circuit breaker is recommended to ensure that all terminal connections remain secure and that the device is free from dust or debris. If the breaker trips, investigate the cause of the overload or short circuit before resetting the switch.