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- MT40H2
- MasterPact Circuit Breaker Frame
- France
- 422 × 300 × 352 mm
- 50 kg
- Xiamen, China
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Product Overview
The Schneider MT40H2 MasterPact Circuit Breaker Frame is a high-current air circuit breaker frame associated with the MasterPact NW40H2 configuration. It is used in low-voltage power distribution systems where high current-carrying capacity and substantial short-circuit interruption performance are required.
The NW40H2 configuration has a rated current of 4000 A and belongs to the H2 breaking performance category. It provides a rated ultimate short-circuit breaking capacity of 100 kA at 440 V AC, making it suitable for main power distribution and high-capacity feeder protection in industrial switchgear installations.
The MasterPact NW platform is used in large electrical distribution systems, including manufacturing plants, commercial infrastructure, and industrial power distribution facilities. Its three-pole fixed configuration supports installation in compatible low-voltage switchgear assemblies.
The MT40H2 frame can be integrated with compatible MasterPact electronic protection units and operating accessories. These components provide the protection, monitoring, and switching functions required by the electrical distribution system.
For replacement applications, engineers should verify the complete NW40H2 configuration, including rated current, breaking capacity, pole arrangement, mounting type, protection unit, and electrical connection requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | MT40H2 |
| Product Type | MasterPact Circuit Breaker Frame |
| Product Series | MasterPact NW |
| Circuit Breaker Configuration | NW40H2 |
| Circuit Breaker Type | Air Circuit Breaker |
| Rated Current | 4000 A |
| Number of Poles | 3P |
| Breaking Capacity | 100 kA at 440 V AC |
| Breaking Capacity at 525 V AC | 85 kA |
| Breaking Capacity at 690 V AC | 85 kA |
| Rated Operational Voltage | 690 V AC |
| Frequency | 50/60 Hz |
| Performance Level | H2 |
| Mounting Type | Fixed |
| Control Unit | Without Control Unit |
| Suitability for Isolation | Yes |
| Utilization Category | Category B |
| Insulation Voltage | 1000 V AC |
| Impulse Withstand Voltage | 12 kV |
| Short-Time Withstand Current | 85 kA for 1 s |
| Maximum Breaking Time | 25 ms |
| Maximum Closing Response Time | 70 ms |
| Dimensions | 422 × 300 × 352 mm |
| Weight | 50 kg |
Product Features
- 4000 A Current Rating: Supports high-capacity electrical distribution in industrial and commercial power systems.
- H2 Breaking Performance: Provides a rated ultimate short-circuit breaking capacity of 100 kA at 440 V AC.
- Three-Pole Configuration: Supports three-phase electrical distribution and circuit protection.
- MasterPact NW Platform: Belongs to Schneider Electric’s high-current air circuit breaker product family.
- Fixed Mounting Arrangement: Supports direct installation in compatible low-voltage switchgear assemblies.
- High Short-Time Withstand Capacity: Supports 85 kA short-time withstand current for 1 second.
- Isolation Capability: Suitable for electrical isolation according to EN/IEC 60947-2.
- Protection Unit Compatibility: Supports compatible MasterPact electronic trip units according to the selected configuration.
Working Principle
The MasterPact NW40H2 operates as an air circuit breaker that controls the electrical connection between the incoming power supply and the downstream distribution system.
During normal operation, current flows through the main contacts of the breaker to supply connected electrical equipment. The circuit breaker remains closed while the electrical conditions stay within the permitted operating limits.
When an overload or short circuit occurs, the associated electronic protection unit detects the abnormal current condition and initiates the tripping mechanism. The main contacts separate, interrupting the electrical circuit.
As the contacts open, an electrical arc forms between them. The air arc-extinguishing system controls and extinguishes the arc, allowing the breaker to interrupt the fault current within its specified breaking capacity.
The H2 performance configuration provides a rated ultimate short-circuit breaking capacity of 100 kA at 440 V AC. At higher operating voltages of 525 V and 690 V AC, the specified breaking capacity is 85 kA.
Typical Protection Sequence:
Incoming Power Supply → MasterPact NW40H2 Circuit Breaker → Main Distribution Busbar → Downstream Feeder Circuits
After a fault interruption, the cause of the trip should be investigated before the circuit breaker is reset and returned to service.
Role in Schneider MasterPact Power Distribution Architecture
The MT40H2 serves as a main or feeder circuit protection component within compatible MasterPact NW40H2 low-voltage distribution systems.
In a typical industrial switchgear arrangement, the breaker is installed between the incoming electrical supply and the main distribution busbar. It provides switching and fault interruption functions for high-current electrical circuits.
Its 4000 A rated current and H2 breaking performance make it suitable for installations where substantial electrical loads and high prospective short-circuit currents must be managed.
| System Component | Function |
|---|---|
| MT40H2 MasterPact Circuit Breaker | Provides high-current switching and circuit protection |
| Incoming Power Supply | Delivers electrical power to the switchgear |
| Main Distribution Busbar | Distributes power to downstream electrical circuits |
| Micrologic Protection Unit | Provides electronic overload and short-circuit protection |
| Operating Mechanism | Controls circuit breaker opening and closing |
| Auxiliary Contacts | Provide breaker operating status signals |
| Shunt Trip Release | Enables remote electrical tripping |
| Undervoltage Release | Initiates opening under specified undervoltage conditions |
| Switchgear Enclosure | Houses and protects the circuit breaker assembly |
| Downstream Circuit Breakers | Protect individual outgoing distribution circuits |
Industrial Applications
| Application | Typical Use |
|---|---|
| Industrial Power Distribution | Main circuit protection in high-current distribution systems |
| Manufacturing Plants | Protecting electrical supplies for production facilities |
| Commercial Buildings | High-capacity low-voltage electrical distribution |
| Data Centers | Protecting large electrical distribution circuits |
| Power Distribution Rooms | Incoming and feeder circuit protection |
| Process Industries | Protecting electrical supplies for continuous production |
| Infrastructure Projects | Integrating high-capacity switchgear |
| Utility Installations | Main electrical distribution protection |
| Industrial Switchboards | Protecting main distribution busbars |
| Electrical Substations | Low-voltage feeder and distribution protection |
Installation and Maintenance
- Verify Model Configuration: Confirm that MT40H2 corresponds to the required MasterPact NW40H2 configuration, including rated current, breaking capacity, and pole arrangement.
- Check Switchgear Compatibility: Verify the fixed mounting arrangement and electrical connection requirements against the existing switchgear assembly.
- Isolate the Power Supply: Disconnect the upstream power source and apply the required lockout and tagout procedures.
- Verify Absence of Voltage: Use an appropriately rated voltage tester to confirm that all relevant electrical connections are de-energized.
- Inspect Main Connections: Examine incoming and outgoing connection points for overheating, oxidation, corrosion, or mechanical damage.
- Check Protection Configuration: Verify the installed protection unit and its settings against the electrical coordination requirements.
- Inspect Operating Mechanism: Check the opening, closing, and stored-energy operating functions according to the applicable maintenance instructions.
- Check Auxiliary Accessories: Inspect auxiliary contacts, shunt releases, undervoltage releases, and other installed accessories.
- Verify Mounting Security: Confirm that the circuit breaker is correctly positioned and secured within the switchgear assembly.
- Perform Electrical Testing: Carry out the required insulation, contact resistance, and protection function tests using approved procedures.
- Conduct Operational Checks: Verify mechanical and electrical operating functions before returning the equipment to service.
- Document Maintenance Results: Record the breaker configuration, protection settings, inspection findings, test results, and maintenance date.
Compatible System Components
| Component | Product Description | Function |
|---|---|---|
| Micrologic 5.0 | MasterPact Electronic Trip Unit | Provides electronic protection functions |
| Micrologic 6.0 | MasterPact Electronic Trip Unit | Supports advanced circuit protection |
| MCH | MasterPact Charging Motor | Charges the stored-energy operating mechanism |
| MX | MasterPact Shunt Trip Release | Enables remote circuit breaker tripping |
| MN | MasterPact Undervoltage Release | Initiates opening under undervoltage conditions |
| OF Auxiliary Contact | MasterPact Auxiliary Switch | Indicates breaker open or closed status |
Recommended Related Models
| Model | Product Description |
|---|---|
| NW32H2 | Schneider MasterPact NW 3200 A H2 Air Circuit Breaker |
| NW40H1 | Schneider MasterPact NW 4000 A H1 Air Circuit Breaker |
| NW40H2 | Schneider MasterPact NW 4000 A H2 Air Circuit Breaker |
| NW40H3 | Schneider MasterPact NW 4000 A H3 Air Circuit Breaker |
| NW40H10 | Schneider MasterPact NW 4000 A H10 Air Circuit Breaker |
| NW40HA | Schneider MasterPact NW 4000 A HA Air Circuit Breaker |
Key Advantages
- 4000 A rated current for high-capacity electrical distribution.
- H2 performance with 100 kA breaking capacity at 440 V AC.
- Three-pole configuration for three-phase power systems.
- Fixed mounting arrangement for compatible switchgear installations.
- Supports overload and short-circuit protection.
- Compatible with the MasterPact NW protection and accessory ecosystem.
- Suitable for industrial and commercial low-voltage distribution applications.
Technical FAQs
1. What is the rated current of the MT40H2?
The associated MasterPact NW40H2 configuration has a rated current of 4000 A at 40 °C. This distinguishes it from the NW32H2 configuration, which has a rated current of 3200 A.
2. What is the short-circuit breaking capacity of the NW40H2?
The H2 configuration provides a rated ultimate short-circuit breaking capacity of 100 kA at 440 V AC. The corresponding breaking capacity is 85 kA at 525 V and 690 V AC.
3. Does the MT40H2 include an electronic protection unit?
The specified configuration is supplied without a control unit. A compatible Micrologic protection unit must be selected according to the required overload, short-circuit, and other protection functions.
4. What should be checked when replacing an MT40H2 circuit breaker?
Verify the 4000 A rated current, H2 breaking performance, three-pole configuration, fixed mounting arrangement, and control unit requirements. The switchgear connection arrangement and installed accessories should also be checked before replacement.