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 NB3L Residual Current Operated Circuit Breaker (RCBO) offers comprehensive electrical safety by integrating Miniature Circuit Breaker (MCB) and Residual Current Device (RCD) functions. This device provides robust protection against overload, short-circuit, and earth leakage faults, safeguarding both personnel and electrical installations.

NB3L RCBO ensures reliable circuit protection in diverse applications across residential, commercial, and industrial electrical systems, enhancing overall safety and compliance.

Helpful Links

Blog

Explore expert insights, trends, and CHINT perspectives on the smart energy industry.

Resources

Download essential CHINT resources for your business needs.

Download Now

Have questions? Contact us for support and solutions.

Collapsed

Expand

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.

Please enter keywords to search

Choose your country & Language

Asia Pacific

Middle East & Africa

Europe

North America

Latin America

Choose your country & Language

Please enter keywords to search

NB3L-40 Residual Current Operated Circuit Breaker with Over-current Protection (Magnetic)

Product Information

Helpful Links

FAQs

NB3L-40 Residual Current Operated Circuit Breaker with Over-current Protection (Magnetic)

Product Information

Related Products

Helpful Links

FAQs