Product Overview

The Schneider MT08N2 Circuit Breaker is an industrial low-voltage air circuit breaker (ACB) from the Masterpact MT product family. It is designed for use in electrical distribution systems where high-current circuits require reliable switching, isolation, and protection against abnormal electrical conditions.

Air circuit breakers are commonly installed in main distribution boards, switchboards, and industrial power control panels. They help protect electrical systems by interrupting current when an overload or short-circuit condition exceeds the configured protection limits. Their ability to handle high current ratings makes them suitable for applications involving large electrical loads and multiple downstream distribution circuits.

The MT08N2 is associated with the 800 A current class. Its N2 designation identifies a particular breaking-capacity configuration within the Masterpact MT range. The exact rated breaking capacity depends on the applicable voltage and product configuration, so the nameplate and original Schneider Electric documentation should be checked before selecting the breaker for a specific installation.

As part of an industrial power distribution system, the breaker can serve as an incoming circuit protection device, a main switchboard breaker, or a feeder protection component. It may be integrated with compatible protection releases and electrical accessories, depending on the installed configuration.

The MT08N2 is particularly relevant to maintenance and replacement work in established industrial facilities. When sourcing this model, engineers and purchasing teams should verify the complete catalog identification, pole configuration, mounting arrangement, trip unit, auxiliary contacts, and operating mechanism.

Technical Specifications

Important: The table records the supplied product information and general product-family identification. Rated operational voltage, Icu, Ics, Icw, pole count, trip-unit type, and mounting arrangement must be confirmed from the exact MT08N2 nameplate and technical documentation before installation or replacement.

Function and Working Principle

The Schneider MT08N2 is designed to provide switching and protective functions in low-voltage electrical distribution systems. Its main purpose is to carry normal operating current while interrupting the circuit when an electrical fault or abnormal operating condition requires disconnection.

1. Overload Protection

An overload occurs when a circuit carries more current than its intended operating level for a sustained period. This may result from excessive equipment demand, motor loading, or an incorrectly designed distribution arrangement.

When equipped with a compatible protection release and correctly configured settings, the circuit breaker can detect an overload condition and initiate a trip.

The trip characteristics must be coordinated with the cable ratings, downstream protective devices, and connected equipment. The 800 A frame or current class should not be interpreted as a universal protection setting for every installation.

2. Short-Circuit Protection

A short circuit can produce a very high fault current over a short period. If the fault is not interrupted, it may cause severe thermal and electromechanical stress on conductors, busbars, and connected equipment.

The circuit breaker’s short-circuit interruption capability is determined by its rated breaking capacity at the applicable system voltage. The N2 designation identifies a breaking-capacity class, but the exact Icu and Ics values must be confirmed from the specific manufacturer’s data.

Correct selection requires a short-circuit study of the electrical installation. The breaker must have sufficient interrupting capacity for the prospective fault current at its installation point.

3. Electrical Isolation

A circuit breaker can provide a means of isolating a circuit for maintenance and inspection when the exact device is rated and installed for that purpose.

Isolation procedures must follow the applicable electrical safety rules. Operators should verify the device’s isolation suitability and use approved lockout and verification procedures before working on downstream equipment.

4. Switching Operations

The Masterpact MT family is designed for industrial switching duties. Depending on the installed operating mechanism and accessories, the breaker may support manual or electrically operated switching arrangements.

The exact operation method should be checked before planning remote control or automatic switching. Electrical closing and opening accessories are not necessarily included in every breaker configuration.

5. Protection Coordination

A circuit breaker must operate as part of a coordinated protection system. Its trip characteristics should be evaluated alongside upstream and downstream protective devices.

Proper coordination helps limit unnecessary power interruptions and ensures that the protective device nearest to a fault can respond appropriately where the system design permits.

Role in Industrial Power Distribution Systems

The MT08N2 can be used as a protective switching device in industrial electrical distribution systems. Its role depends on the switchboard design, connected load, protection strategy, and selected accessories.

Main Incoming Circuit Protection

In some installations, an air circuit breaker is installed as the main incoming breaker of a distribution board. It provides a switching and protection point between the incoming electrical supply and the downstream busbar system.

For this application, engineers must verify the supply voltage, available fault current, current rating, and protection coordination.

Feeder Circuit Protection

The breaker may also be used to protect a major outgoing feeder supplying a production line, motor control center, or secondary distribution panel.

The selected trip settings must reflect the feeder’s conductor capacity, load characteristics, and downstream protection requirements.

Integration with Power Monitoring Systems

Industrial facilities may use power meters, PLCs, supervisory control systems, and energy-management platforms to monitor electrical distribution.

Where suitable auxiliary contacts, communication accessories, or monitoring devices are installed, breaker status and related information may be incorporated into a wider monitoring system.

The standard breaker configuration should not be assumed to include every communication or monitoring function. Confirm the installed accessories and supported interface before designing system integration.

Support for Industrial Maintenance

In an existing facility, the MT08N2 may be part of a long-established switchboard. Accurate model identification helps maintenance teams source compatible replacement equipment and reduce the risk of installing a breaker with unsuitable electrical or mechanical characteristics.

Industrial Applications

The Schneider Masterpact MT family is intended for demanding low-voltage distribution environments. The MT08N2’s 800 A class makes it relevant to appropriately engineered power distribution applications.

1. Industrial Manufacturing Plants

Manufacturing facilities often contain multiple production lines, motor control centers, and auxiliary electrical systems. An air circuit breaker may be used at the main distribution or feeder level to protect a major section of the electrical network.

The breaker must be selected according to the plant’s maximum demand, prospective fault current, and protection coordination requirements.

2. Motor Control Centers

Motor control centers distribute power to multiple motors and associated control equipment. An ACB can serve as an upstream protective device supplying a motor control center or a major section of its distribution system.

Motor starting currents, load diversity, and downstream protective devices should be included in the engineering assessment.

3. Commercial and Industrial Buildings

Large buildings may have substantial electrical distribution requirements for HVAC equipment, elevators, pumps, lighting, and other services.

An appropriately rated air circuit breaker can be used in a main low-voltage switchboard to provide circuit switching and protection.

4. Infrastructure Facilities

Water treatment plants, transportation facilities, utility installations, and other infrastructure projects depend on reliable electrical distribution.

A suitably configured ACB can protect major distribution circuits and support planned maintenance procedures.

5. Data Centers and Critical Power Systems

Data centers require carefully coordinated electrical protection across incoming supplies, distribution boards, UPS systems, and downstream loads.

An air circuit breaker may be used at an appropriate distribution level, subject to system design. The breaker selection must account for fault levels, selectivity, redundancy strategy, and the required operational continuity.

Installation and System Integration

Correct installation is essential for the electrical safety and operating reliability of an air circuit breaker.

1. Verify the Complete Product Configuration

Before installation, inspect the nameplate and confirm that the breaker is actually an MT08N2. Check its pole count, rated current, rated operational voltage, breaking capacity, mounting type, and trip unit.

Do not assume that two breakers with the same MT08N2 model designation have identical accessories or mechanical arrangements.

2. Confirm Switchboard Compatibility

The supplied dimensions are 301 × 196 × 276 mm. These should be checked against the physical unit and the manufacturer’s dimensional drawings.

Confirm the required panel cutout, mounting points, connection pitch, busbar arrangement, and operating clearance. A breaker that fits dimensionally may still be electrically or mechanically incompatible with the existing switchboard.

3. Check Electrical Ratings

The installation must be assessed against:

• Rated operational voltage.
• Rated current and protection settings.
• Prospective short-circuit current.
• Rated ultimate breaking capacity (Icu).
• Rated service breaking capacity (Ics).
• Short-time withstand current (Icw), where applicable.
• Cable and busbar ratings.
• Upstream and downstream protection coordination.

These parameters should be verified from the exact product documentation and the electrical system study.

4. Inspect Busbar and Cable Connections

Check the condition and compatibility of busbars, terminals, conductors, and connection hardware. Connection surfaces must be clean and free from damage or contamination.

Use the specified tightening procedures and torque values. Incorrect connections can cause overheating, voltage drop, and equipment damage.

5. Configure the Protection Release

If the breaker is supplied with an electronic or other protection release, verify its model and available protection functions.

Settings should be determined by a qualified electrical engineer based on the installation’s load, cable ratings, fault levels, and coordination requirements. Do not copy settings from another breaker without checking the system conditions.

6. Verify Operating Mechanism and Accessories

Depending on the required application, the breaker may need auxiliary contacts, shunt trip, undervoltage release, motor mechanism, or other accessories.

Confirm the accessory part numbers and compatibility with the exact breaker configuration. Do not assume these components are included with a basic breaker assembly.

7. Commissioning and Testing

Before energizing the system, qualified personnel should inspect the mechanical installation, electrical connections, grounding, and protection settings.

Testing should follow the manufacturer’s instructions and the site’s electrical commissioning procedures. Functional checks may include mechanical operation, trip-circuit verification, auxiliary-contact operation, and protection-system testing where applicable.

All work must be performed under appropriate electrical safety procedures by qualified personnel.

Compatible System Components

The MT08N2 may be installed with other equipment in a low-voltage distribution system. Compatibility must be checked against the exact breaker version and switchboard design.

The listed components are examples of equipment that may be used in a complete installation. They are not necessarily supplied with the MT08N2.

Alternative Models and Replacement Considerations

When replacing a Masterpact MT08N2, the replacement must match the electrical and mechanical requirements of the existing installation.

Before selecting an alternative, compare:

• Rated current and voltage.
• Pole configuration.
• Icu, Ics, and Icw ratings.
• Fixed or drawout mounting arrangement.
• Dimensions and connection pitch.
• Trip unit and protection functions.
• Auxiliary and electrical operating accessories.
• Control voltage requirements.
• Switchboard and busbar compatibility.
• Protection coordination and commissioning requirements.

A breaker with an 800 A rating is not necessarily a suitable replacement for another 800 A breaker. The breaking capacity, mechanical arrangement, protection release, and electrical accessories can differ significantly.

Key Advantages

High-Current Distribution Capability

The MT08N2 belongs to the 800 A current class, making it suitable for appropriately designed industrial distribution circuits.

Circuit Protection

When fitted with the correct protection release and configured for the application, the breaker can provide protection against overload and short-circuit conditions.

Industrial Switching Function

The Masterpact MT family is designed for low-voltage switching applications in industrial and commercial electrical distribution systems.

Integration with Distribution Equipment

The breaker can be incorporated into suitable switchboards and distribution assemblies when the electrical and mechanical interfaces match.

Configurable Accessories

Depending on the exact version, compatible auxiliary and operating accessories may support remote control, status indication, and integration with monitoring systems.

Maintenance and Replacement Support

Accurate identification of the MT08N2 helps maintenance teams locate the correct equipment for existing installations and assess replacement options.

Technical FAQs

1. What is the Schneider MT08N2?

The Schneider MT08N2 is an air circuit breaker from the Masterpact MT family. It is associated with an 800 A current class and is designed for low-voltage power distribution and circuit protection.

2. What does MT08N2 mean?

The MT designation identifies the Masterpact MT product family. The 08 identifies the 800 A current class, while N2 identifies a particular breaking-capacity configuration. The exact electrical ratings should be confirmed from the manufacturer’s documentation.

3. What is the rated current of the MT08N2?

The model is associated with an 800 A current class. The actual protection setting and suitability for a specific circuit depend on the installed trip unit and system design.

4. What is the breaking capacity of this circuit breaker?

The breaking capacity is associated with the N2 configuration and varies according to the rated operational voltage and applicable standard. Confirm the Icu and Ics values from the exact product nameplate or technical datasheet before installation.

5. Is the MT08N2 suitable for industrial distribution panels?

It may be suitable for industrial distribution panels designed for the breaker’s electrical and mechanical requirements. Engineers must verify voltage, current, fault level, mounting arrangement, and protection coordination.

6. Can the MT08N2 be operated remotely?

Remote operation depends on the installed operating mechanism and accessories. A basic breaker should not be assumed to include a motor mechanism or remote-control accessories.

7. Can it be integrated with a PLC?

Breaker status and control may be integrated into a PLC system through compatible auxiliary contacts and electrical accessories. The required interfaces and control voltages must be confirmed for the actual configuration.

8. What should be checked before replacing an MT08N2?

Check the complete model identification, current and voltage ratings, breaking capacity, pole count, mounting arrangement, trip unit, terminal configuration, and installed accessories. Also verify that the replacement is compatible with the existing switchboard.

9. What is the difference between Icu and Ics?

Icu is the rated ultimate short-circuit breaking capacity, while Ics is the rated service short-circuit breaking capacity. Both are important when assessing a breaker for a particular electrical installation. Their values must be evaluated at the relevant operating voltage.

10. Is the supplied weight of 14 kg suitable for product listing?

The supplied weight of 14 kg is retained as the listing value. Confirm whether it represents the breaker itself or the packaged shipment before using it for freight quotations.

Procurement and Maintenance Recommendations

When sourcing the Schneider MT08N2, begin by checking the exact product identification and the electrical requirements of the installation. The 800 A current class alone is not enough to establish compatibility.

For replacement projects, compare the original breaker with the proposed unit in terms of voltage rating, breaking capacity, pole configuration, mounting arrangement, trip unit, and accessories. Request clear photographs of the nameplate, front panel, terminals, and operating mechanism where possible.

For used or refurbished equipment, check the mechanical condition, terminal surfaces, operating mechanism, trip unit, and available test records. Confirm whether the breaker has been inspected or functionally tested and establish the applicable warranty and return conditions.

For maintenance, follow the manufacturer’s inspection and servicing instructions. Periodically assess the condition of electrical connections, insulation, operating mechanisms, protection releases, and auxiliary circuits according to the site’s maintenance program.

Protection settings should be reviewed whenever the electrical network changes, including transformer replacement, busbar modifications, new loads, or changes to downstream protective devices. Any adjustment should be carried out by qualified personnel following an appropriate protection coordination study.

Conclusion

The Schneider MT08N2 Masterpact MT Air Circuit Breaker is an industrial low-voltage protection device associated with an 800 A current class. It is designed for use in power distribution systems where circuit switching, overload protection, and short-circuit interruption are essential.

For maintenance and procurement applications, confirming the complete breaker configuration is critical. Rated breaking capacity, pole count, mounting arrangement, trip unit, and accessories must all match the installation requirements. Accurate identification and careful compatibility checks help support safe equipment replacement and reliable operation of industrial electrical distribution systems.