NB3LEU Residual Current Operated Circuit Breaker with Over-current Protection(Electronic) Datasheet & Manual

NB3LEU Residual Current Operated Circuit Breaker with Over-current Protection(Electronic)

The CHINT NB3LEU RCBO is a high-performance protective device that combines residual current and over-current protection in one compact unit. Designed for AC 50/60 Hz, 240 V circuits, it provides reliable protection against overloads, short-circuits, and electric leakage, ensuring safety for personnel and equipment. Featuring electronic tripping, Type AC/A leakage sensitivity, and B/C tripping curves, it is ideal for residential, commercial, and light industrial installations requiring enhanced electrical safety and stability.

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FAQs

What makes the NB3LEU RCBO different from traditional breakers?

It combines leakage, overload, and short-circuit protection in one compact device using electronic tripping, offering faster response and improved reliability over purely thermal types.

What are Type A and Type AC sensitivities?

Type A: Detects both AC and pulsating DC leakage currents.

Type AC: Detects only sinusoidal AC leakage currents.

This ensures compatibility with various load types and system conditions.

Can this breaker handle high fault currents?

Yes. The NB3LEU offers a 10 kA short-circuit capacity, making it suitable for robust protection in both residential and commercial environments.

What installation options are available?

It can be mounted on a 35 mm DIN rail and connected via cable, U-type, or pin-type busbars, supporting flexible panel configurations.

Does temperature affect performance?

Performance is rated at 30 °C, but derating applies above that (e.g., 0.9 at 50 °C, 0.85 at 60 °C) to ensure safe operation in warmer environments.

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NB3LEU Residual Current Operated Circuit Breaker with Over-current Protection(Electronic)

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NB3LEU Residual Current Operated Circuit Breaker with Over-current Protection(Electronic)

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