Product Introduction

The Schneider NW12N1 Masterpact Air Circuit Breaker is designed for low-voltage power distribution systems requiring reliable protection and switching at high current levels. With a 1250 A rated current and N1 breaking-performance category, it is suitable for demanding industrial and commercial electrical installations.

As part of the Masterpact NW series, the NW12N1 is available in different configurations, including fixed and drawout mounting arrangements. Depending on the selected reference, it can also be supplied with different pole configurations and protection-unit options.

For replacement projects, checking the complete ordering reference is essential. The mounting type, number of poles, trip unit, rated current, and connection arrangement should all match the requirements of the existing switchgear.

Technical Specifications

Parameter	Description
Brand	Schneider Electric
Model	NW12N1
Product Name	Masterpact NW Circuit Breaker
Product Type	Air Circuit Breaker (ACB)
Product Family	Masterpact NW
Rated Current	1250 A
Performance Category	N1
Rated Operational Voltage	Up to 690 V AC, 50/60 Hz
Rated Ultimate Short-Circuit Breaking Capacity	42 kA at 440 V AC
Rated Insulation Voltage	1000 V AC
Application	Low-voltage power distribution protection
Mounting Type	Fixed or drawout, depending on reference
Pole Configuration	3P or 4P, depending on reference
Dimensions (W × H × D)	537 × 352 × 297 mm
Weight	65 kg / 143.30 lb

Note: The supplied dimensions and weight correspond to a particular configuration. Confirm the complete model reference, pole arrangement, mounting type, and control-unit configuration before ordering.

Recommended Related Models

The following Schneider Electric Masterpact NW models are useful for comparing frame ratings and short-circuit performance:

Schneider NW12H1 Circuit Breaker – 1250 A frame, H1 performance category.
Schneider NW12H2 Circuit Breaker – 1250 A frame, H2 performance category.
Schneider NW10N1 Circuit Breaker – 1000 A frame, N1 performance category.
Schneider NW16N1 Circuit Breaker – 1600 A frame, N1 performance category.

These models share the Masterpact NW platform, but their electrical ratings and configurations differ. Verify compatibility before selecting an alternative.

Popular Related Models

Other Schneider Electric Masterpact NW circuit breakers used in industrial power distribution projects include:

Schneider NW08N1 Circuit Breaker
Schneider NW10N1 Circuit Breaker
Schneider NW12N1 Circuit Breaker
Schneider NW16N1 Circuit Breaker
Schneider NW20H1 Circuit Breaker
Schneider NW32H1 Circuit Breaker

When sourcing the Schneider NW12N1, provide the complete model reference and configuration details. Confirming the breaker’s electrical ratings, mounting arrangement, and protection-unit requirements helps ensure that the selected equipment is suitable for the intended switchboard and power distribution system.

Applications

The Schneider NW12N1 is part of the Masterpact NW family of low-voltage air circuit breakers. Designed for high-current power distribution systems, it is intended to provide circuit protection and switching capabilities in industrial, commercial, and infrastructure installations.

Typical application areas include:

Industrial power distribution: Protection of main incoming circuits and high-current feeders in manufacturing plants.
Commercial electrical systems: Integration into main distribution boards in large buildings and commercial facilities.
Power distribution switchgear: Installation in compatible low-voltage switchboards and electrical cabinets.
Infrastructure facilities: Circuit protection for transportation, utility, and public infrastructure systems.
Critical electrical installations: Supports coordinated protection strategies in facilities where dependable power distribution is important.

Advantages and Key Features

High-current distribution capability

The NW12N1 belongs to the NW12 frame designation within the Masterpact NW range. Its selection should be based on the required rated current and the electrical characteristics of the installation.

N1 performance category

The N1 designation identifies a specific short-circuit performance level. The appropriate breaking capacity must be verified at the system's operating voltage and against the prospective fault current.

Flexible protection configuration

Compatible protection units allow the breaker to be configured according to the installation's overload and short-circuit protection requirements. Available functions depend on the specific trip-unit reference.

Switchgear integration

Masterpact NW circuit breakers are designed for integration into suitable low-voltage switchgear. Mounting arrangement, terminal connections, pole configuration, and accessory compatibility should be checked before installation.

Professional maintenance and replacement

Accurate model identification helps maintenance teams source the correct breaker and reduce compatibility problems during equipment replacement.

Technical FAQs

Q1: What is the Schneider NW12N1 used for?

The NW12N1 is an air circuit breaker intended for low-voltage power distribution. It provides switching and circuit protection against electrical faults when equipped with the appropriate protection unit.

Q2: What does the NW12 designation represent?

NW12 identifies the breaker frame designation within the Masterpact NW family. The actual rated current must be confirmed from the complete product reference and nameplate.

Q3: What does the N1 performance category mean?

N1 identifies a short-circuit breaking performance category. The exact breaking capacity depends on the rated operational voltage and the applicable product configuration.

Q4: Which trip units can be used with the NW12N1?

Trip-unit compatibility depends on the breaker generation and complete reference. Check the manufacturer's compatibility information before selecting a protection or control unit.

Q5: Can the NW12N1 be used in a three-phase distribution system?

A compatible three-pole version can be used in three-phase applications. The appropriate pole arrangement should be selected according to the system's electrical design.

Q6: Is the NW12N1 available in fixed and drawout versions?

Masterpact NW breakers are available in different mounting arrangements, including fixed and drawout versions, depending on the ordering reference. These configurations have different installation requirements.

Q7: Does the breaker support remote operation?

Remote operation may be possible with compatible electrical operating mechanisms and accessories. The required components depend on the exact breaker configuration.

Q8: What should be inspected before commissioning?

Check the nameplate, mechanical operation, electrical connections, insulation condition, trip-unit settings, and installed accessories. Commissioning should be completed by qualified electrical personnel.

Q9: What can cause an NW12N1 to trip repeatedly?

Possible causes include overload, short-circuit faults, incorrect protection settings, wiring problems, or abnormal operating conditions. Investigate the trip indication and connected circuit before resetting the breaker.

Q10: Can the NW12N1 replace an NW10N1?

Not automatically. The two references have different frame designations, and their electrical and mechanical configurations may differ. Verify rated current, breaking capacity, mounting arrangement, connections, and switchboard compatibility before replacement.

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