Description

The CHINT NB3LEG-B25 Type A Residual Current Operated Circuit Breaker with Over-current Protection (RCBO) is a vital component in electrical safety systems, designed for residential, commercial, and light industrial applications. This RCBO features a rated current of 25A, a B Curve tripping characteristic, and a short-circuit breaking capacity of 6kA, making it ideal for circuits that handle moderate to high loads, such as power outlets, HVAC systems, and lighting circuits.

With a rated residual operating current (I∆n) of ≤ 30 mA, the NB3LEG-B25 provides essential protection against electric shock in case of direct contact with live electrical components. This feature is particularly crucial in environments where safety is paramount, helping to mitigate risks associated with electrical faults.

The device includes two key tripping classes for enhanced protection:

• AC class, which guarantees effective tripping for sinusoidal, alternating currents, regardless of whether these currents are quickly applied or gradually increase. This ensures reliable operation in standard AC electrical systems.
• A class, which extends protection to cover both sinusoidal and pulsed DC residual currents, making it suitable for circuits with modern electronic devices and sensitive equipment.

The B Curve (3-5 In) tripping characteristic is designed to provide effective protection for circuits with low inrush currents, such as resistive loads and lighting systems. This characteristic ensures robust protection against overloads and short circuits, thereby safeguarding both individuals and longer cable runs in TN and IT systems.

The CHINT NB3LEG series includes a variety of models to cater to different electrical needs:

• NB3LEG-B06 Type A RCBO: 6A variant for low power applications.
• NB3LEG-B10 Type A RCBO: 10A model suitable for moderate loads.
• NB3LEG-B16 Type A RCBO: 16A variant designed for higher capacity circuits.
• NB3LEG-B20 Type A RCBO: 20A model for more demanding applications.
• NB3LEG-B32 Type A RCBO: 32A option for high-power requirements.

Each model in the NB3LEG series offers 6kA short-circuit protection and 30mA residual current protection, ensuring reliable performance and safety in a wide range of installations. Designed for straightforward installation and maintenance, these RCBOs are essential for modern electrical safety systems, providing peace of mind and protection for both users and equipment.