Description

The CHINT NB3LEG-B40 Type A Residual Current Operated Circuit Breaker with Over-current Protection (RCBO) is a highly reliable safety device designed to protect electrical circuits in residential, commercial, and industrial applications. With a rated current of 40A, this RCBO is engineered for high-load environments and features a B Curve tripping characteristic along with a robust short-circuit breaking capacity of 6kA.

Designed to enhance electrical safety, the NB3LEG-B40 offers a rated residual operating current (I∆n) of ≤ 30 mA, which provides essential protection against electric shock in case of direct contact with live electrical components. This feature is particularly important in environments where safety is paramount, helping to mitigate risks associated with electrical faults.

The device includes two important tripping classes:

• AC class: This ensures effective tripping for sinusoidal, alternating currents, whether they are rapidly applied or gradually increase, ensuring dependable operation in standard AC electrical systems.
• A class: This class allows for tripping in response to sinusoidal and pulsed DC residual currents, making the RCBO suitable for circuits with modern electronic devices.

The B Curve (3-5 In) tripping characteristic provides protection against overloads and short circuits, particularly for circuits with moderate inrush currents. This design is effective for protecting both individuals and long cable runs in TN and IT systems, ensuring comprehensive safety across various applications.

In addition to the B Curve, the device supports a C Curve (5-10 In), which is designed for applications involving resistive and inductive loads with low inrush currents. This feature enhances the versatility of the NB3LEG-B40, allowing it to be used in a variety of settings.

The CHINT NB3LEG series includes various models to accommodate different electrical needs, including:

• 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 demanding applications.
• NB3LEG-B25 Type A RCBO: 25A option for substantial loads.
• NB3LEG-B32 Type A RCBO: 32A model for high-power requirements.

Each model in the series guarantees 6kA short-circuit protection and 30mA residual current protection, ensuring reliable performance and safety in a broad range of installations. The NB3LEG-B40 RCBO is easy to install and maintain, making it an essential component for modern electrical systems and providing peace of mind for both users and equipment.