CHNAILE Industrial Air Circuit Breaker 4000A | NLW3HU-4000-3P ACB

The CHNAILE NLW3HU-4000-3P High-Capacity Air Circuit Breaker (ACB) is designed to provide reliable and intelligent protection for large low-voltage power distribution systems. With a rated current of 4000A and a 3-pole configuration, it ensures stable performance in demanding industrial environments such as factories, power distribution rooms, commercial complexes, and critical infrastructure.

Built with a high-accuracy electronic trip unit, the NLW3HU-4000-3P offers long-time, short-time, instantaneous, and ground-fault protection with fully adjustable settings. This enables precise coordination within complex electrical networks, improves operational safety, and reduces the risk of equipment damage caused by overloads or short circuits.

The breaker features a high breaking capacity, advanced arc-extinguishing technology, and strong mechanical endurance, ensuring reliable interruption of fault currents even under heavy load conditions. The draw-out structural design allows easy installation, testing, and maintenance, reducing downtime and improving system efficiency. A clear operating panel, visible indicators, and robust interlocking mechanisms enhance operational safety and provide a user-friendly interface.

To support modern smart distribution systems, the breaker can integrate intelligent monitoring functions, including real-time current data, fault analysis, communication modules (such as RS485), and remote supervision. This makes it suitable for digital energy management and enhances overall system sustainability.

With durable construction, high stability, and consistent performance, the CHNAILE NLW3HU-4000-3P is an excellent choice for customers requiring large-capacity, high-reliability low-voltage circuit protection.

NLW3HU-4000-3P Air Circuit Breaker (ACB)

⚙️ General Specifications

• Model: NLW3HU-4000-3P

• Type: Air Circuit Breaker

• Brand: CHNAILE

• Poles: 3P

• Installation: Fixed / Withdrawable

• Category: A / B

Electrical Ratings

• Rated Current: 4000A

• Rated Operational Voltage: 400V / 690V

• Insulation Voltage: 1000V

• Impulse Voltage: 12kV

• Frequency: 50/60Hz

• Breaking Capacity (Icu): 65kA / 80kA

• Service Breaking (Ics): Up to 100% Icu

• Short-Time Withstand (Icw): 50kA–80kA

️ Protection Features

• Overload (L)

• Short-time delay (S)

• Instantaneous (I)

• Ground fault (optional)

• Under-voltage

• Over-voltage (optional)

• Remote control (optional)

• Programmable electronic trip unit with LCD

Accessories & Options

• Auxiliary contacts NO/NC

• Shunt release

• Under-voltage release

• Motor operating mechanism

• RS485 communication (Modbus-RTU)

• Mechanical / electrical interlocking

• Panel self-test

Physical

• Withdrawable structure

• Top/bottom wiring

• Standard cabinet installation

• Weight: 45–60kg