Introduction

The Schneider Electric NW40H1 Circuit Breaker is engineered for high-capacity low-voltage power distribution applications where dependable switching and electrical protection are essential. As part of the MasterPact NW series, it combines a robust air circuit breaker design with configurable electronic protection and installation options.

With a rated current of 4000 A, the NW40H1 is intended for demanding distribution systems found in large industrial facilities, commercial infrastructure, and centralized electrical switchgear. Its H1 breaking-capacity classification provides a rated ultimate short-circuit breaking capacity of 65 kA at 440 V AC, making it important to evaluate the model against the actual fault-current conditions of the installation.

A major benefit of the MasterPact NW platform is its configuration flexibility. Depending on the selected reference, the NW40H1 can be equipped with compatible MicroLogic trip units, auxiliary contacts, electrical operating accessories, and fixed or drawout mounting arrangements.

For industrial maintenance departments and electrical equipment distributors, the NW40H1 is also relevant to replacement and modernization projects. Its established product family makes it easier to identify related components and configuration options when planning equipment upgrades.

When purchasing this breaker, buyers should pay particular attention to the complete reference number rather than relying solely on the NW40H1 model designation. Pole count, mounting configuration, trip-unit selection, and accessory requirements can affect installation compatibility.

Whether used in a new switchgear assembly or an existing electrical distribution system, the NW40H1 offers a high-current circuit protection solution for demanding industrial applications.

Technical Specifications

The following table summarizes the supplied physical specifications and the principal product characteristics of the Schneider NW40H1.

Parameter	Specification
Brand	Schneider Electric
Product Series	MasterPact NW
Model	NW40H1
Product Type	Air Circuit Breaker
Rated Current (In)	4000 A
Breaking Capacity Class	H1
Number of Poles	Configuration Dependent
Rated Operational Voltage (Ue)	Up to 690 V AC
Rated Frequency	50/60 Hz
Rated Ultimate Breaking Capacity (Icu)	65 kA at 440 V AC
Rated Service Breaking Capacity (Ics)	Configuration and voltage dependent
Protection Unit	Compatible MicroLogic Trip Unit
Mounting Arrangement	Fixed or Drawout, depending on reference
Operating Mechanism	Manual / Electrical, depending on configuration
Applicable Standard	IEC 60947-2
Dimensions (H × W × D)	439 × 441 × 395 mm
Net Weight	90 kg
Weight Conversion	198.42 lb

Configuration reminder: The dimensions and weight above are based on the information supplied for this product. Confirm the complete Schneider reference before ordering, especially when selecting a replacement breaker for an existing switchgear assembly.

Recommended Related Models

If the NW40H1 does not fully match the electrical requirements of a project, other MasterPact NW models may be worth evaluating. The following products cover different current ratings and protection classes.

Model	Product Type	Rated Current	Selection Consideration
Schneider NW32H1	Air Circuit Breaker	3200 A	Lower current requirement
Schneider NW40H2	Air Circuit Breaker	4000 A	Higher breaking-capacity class
Schneider NW40H3	Air Circuit Breaker	4000 A	Higher fault-interruption requirements
Schneider NW50H1	Air Circuit Breaker	5000 A	Higher current applications
Schneider NW25H1	Air Circuit Breaker	2500 A	Medium-to-high current distribution

The appropriate model should be selected according to rated current, short-circuit level, voltage, selectivity requirements, and installation configuration. These models are alternatives for evaluation, not automatically interchangeable replacements.

Popular Related Models

Schneider Electric MasterPact circuit breakers are widely relevant to industrial distribution panels, electrical maintenance, and switchgear replacement projects. The following models provide additional options for customers sourcing related equipment.

Product Model	Product Description
Schneider NW08N1	MasterPact NW Air Circuit Breaker
Schneider NW10N1	MasterPact NW Air Circuit Breaker
Schneider NW12N1	MasterPact NW Air Circuit Breaker
Schneider NW16N1	MasterPact NW Air Circuit Breaker
Schneider NW20N1	MasterPact NW Air Circuit Breaker
Schneider NW25N1	MasterPact NW Air Circuit Breaker
Schneider NW25H1	MasterPact NW Air Circuit Breaker
Schneider NW32H1	MasterPact NW Air Circuit Breaker
Schneider NW40H1	MasterPact NW Air Circuit Breaker
Schneider NW40HA	MasterPact NW Air Circuit Breaker

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Applications

The Schneider Electric NW40H1 is a high-capacity air circuit breaker from the MasterPact NW family, developed for low-voltage electrical distribution systems with substantial power demands. With a rated current of 4000 A, it is intended for applications where reliable circuit protection, controlled switching, and stable electrical distribution are essential.

Its high-current capability makes it a suitable choice for large industrial installations, centralized switchgear systems, and commercial electrical infrastructure.

Typical application areas include:

Industrial Main Switchboards: Protecting high-capacity incoming feeders and main distribution circuits in manufacturing plants and processing facilities.
Large Commercial Buildings: Supporting electrical distribution in shopping centers, office complexes, airports, and other infrastructure projects.
Power Distribution Centers: Serving as a main or feeder circuit breaker in low-voltage distribution assemblies.
Electrical Substations: Providing switching and protection functions in low-voltage distribution equipment.
Critical Infrastructure: Supporting power distribution arrangements in facilities where electrical reliability and maintenance planning are particularly important.
Industrial Energy Systems: Integrating into large electrical installations that require coordinated protection and high-current switching capabilities.

For electrical contractors and switchgear manufacturers, the NW40H1 provides a practical option for 4000 A distribution applications within the MasterPact NW platform.

Advantages

1. Designed for High-Current Applications

The 4000 A rated-current capacity makes the NW40H1 suitable for large-scale electrical distribution. It can be considered for main incoming circuits and high-capacity feeders where lower-current breakers may not meet system requirements.

2. Established H1 Protection Performance

The H1 breaking-capacity class provides a defined short-circuit interruption capability. This helps engineers coordinate circuit protection according to the prospective fault current and system voltage.

3. Flexible Protection Configuration

Compatible MicroLogic trip-unit options allow the breaker to be configured for different electrical protection requirements. Depending on the selected unit, functions can include overload, short-circuit, and ground-fault protection.

4. Adaptable Switchgear Installation

The MasterPact NW platform supports different installation arrangements, including fixed and drawout configurations. This helps equipment designers select an appropriate solution for new switchgear or existing electrical panels.

5. Reliable Switching Mechanism

The breaker is designed for repeated switching operations in demanding electrical environments. Its mechanical operating system supports controlled opening and closing during normal operation and fault conditions.

6. Integration with Electrical Control Systems

Compatible auxiliary contacts and operating accessories allow the NW40H1 to be incorporated into broader electrical control and monitoring arrangements.

7. Suitable for Equipment Replacement Projects

As part of the established MasterPact NW family, the NW40H1 is relevant to maintenance and replacement projects involving high-capacity low-voltage circuit breakers. Confirming the complete reference helps ensure the correct configuration is selected.

Technical FAQs

Q1: What is the rated current of the Schneider NW40H1 Circuit Breaker?

The NW40H1 has a rated current of 4000 A. It is designed for high-capacity low-voltage electrical distribution systems, including industrial main switchboards and large feeder circuits.

Q2: What does the H1 classification mean for the NW40H1?

H1 identifies the breaker's short-circuit performance class within the MasterPact NW range. The NW40H1 has a rated ultimate short-circuit breaking capacity of 65 kA at 440 V AC.

Q3: What is the rated operational voltage of the NW40H1?

The NW40H1 platform supports a rated operational voltage of up to 690 V AC at 50/60 Hz. The applicable breaking-capacity values must be checked at the intended operating voltage.

Q4: Which MicroLogic protection units are available for the NW40H1?

Compatible MicroLogic trip-unit configurations are available within the MasterPact NW family. The exact selection depends on the breaker reference, sensor arrangement, and required protection functions.

Q5: Can the NW40H1 provide overload and short-circuit protection?

Yes. When equipped with an appropriate compatible electronic trip unit, the breaker can provide overload and short-circuit protection. Additional protection functions depend on the selected MicroLogic configuration.

Q6: What is the difference between NW40H1 and NW40H2?

Both models belong to the 4000 A MasterPact NW family, but they have different short-circuit breaking-capacity classifications. H1 is generally selected for applications requiring a lower fault-interruption rating than the H2 version. The exact ratings should be checked against the applicable voltage.

Q7: Does the NW40H1 support drawout installation?

Drawout versions are available within the MasterPact NW platform. They allow the breaker to be moved between connected, test, and disconnected positions using a compatible chassis and installation arrangement.

Q8: Can the NW40H1 be operated remotely?

Remote operation can be achieved with compatible electrical operating accessories and control circuits. The required opening and closing releases, auxiliary contacts, and control supply must be specified according to the complete breaker configuration.

Q9: What should be checked when replacing an existing NW40H1?

Verify the complete product reference, rated current, pole arrangement, breaking capacity, mounting type, connection system, trip unit, and installed accessories. Mechanical compatibility and electrical coordination must both be confirmed.

Q10: How can unexpected tripping of the NW40H1 be investigated?

Start by reviewing the trip-unit indication and event information. Check for overload conditions, short-circuit events, ground faults, incorrect protection settings, or abnormal operating conditions. After identifying the cause, perform the necessary inspection and testing according to the manufacturer's procedures before returning the breaker to service.

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