NB3L-40 Residual Current Operated Circuit Breaker with over-current protection (Magnetic) Datasheet & Manual

NB3L-40 Residual Current Operated Circuit Breaker with over-current protection (Magnetic)

The CHINT NB3L-40 RCBO combines residual current protection and over-current protection in one compact unit, offering reliable performance in low-voltage electrical systems. It safeguards circuits against overloads, short-circuits, and earth leakage faults, ensuring both equipment and personnel protection. Designed for 400/415 V AC networks, it provides 10 kA breaking capacity, precision tripping through magnetic release technology, and flexible configurations for different load types (B, C, and D curves). The NB3L-40 is ideal for industrial and commercial installations requiring dependable safety and performance.

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FAQs

What is the primary function of the NB3L-40 RCBO?

It provides dual protection against residual current (earth leakage) and over-current (overload and short circuit), ensuring both electrical safety and fire prevention in low-voltage systems.

What types of electrical systems is it suitable for?

It’s ideal for TN and IT systems, particularly for mixed loads — resistive, inductive, or with high inrush currents such as motors and transformers.

What is the difference between Type A and Type AC tripping classes?

Type A: Detects both sinusoidal AC and pulsating DC residual currents.

Type AC: Detects only sinusoidal alternating currents.

How does the tripping curve affect selection?

Choose the B curve for resistive circuits, C curve for mixed loads, and D curve for circuits with heavy inductive equipment such as compressors or pumps.

Can the NB3L-40 operate in high-temperature environments?

Yes, but current ratings must be derated at higher ambient temperatures — e.g., at 60 °C, the permissible current is approximately 85% of the rated value.

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NB3L-40 Residual Current Operated Circuit Breaker with over-current protection (Magnetic)

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NB3L-40 Residual Current Operated Circuit Breaker with over-current protection (Magnetic)

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