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 NB3LEU Residual Current Operated Circuit Breaker (RCBO) is an advanced electronic device that delivers integrated overload, short-circuit, and comprehensive earth leakage protection. It accurately detects residual currents (Type A and AC class) to enhance safety against electric shock and fire hazards. Available in various current ratings, this compact RCBO ensures rapid, reliable fault disconnection, making it ideal for residential, commercial, and industrial electrical installations.

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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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