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- Schneider
- MT63H2
- MasterPact Circuit Breaker Frame
- France
- 422 × 300 × 352 mm
- 50 kg
- Xiamen, China
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Product Overview
The Schneider MT63H2 MasterPact Circuit Breaker Frame is a high-capacity air circuit breaker frame associated with the MasterPact NW63H2 configuration. It is used in low-voltage power distribution systems requiring high current-carrying capacity and substantial short-circuit interruption performance.
The NW63H2 configuration has a rated current of 6300 A and belongs to the H2 breaking performance category. It provides a rated ultimate short-circuit breaking capacity of 150 kA at 440 V AC, making it suitable for large industrial distribution systems and high-capacity main feeder protection.
The MasterPact NW63H2 supports three-phase and four-pole distribution configurations, depending on the selected circuit breaker reference. Fixed and drawout mounting arrangements are also available, allowing the breaker to be integrated into different switchgear designs.
The circuit breaker is used in installations where the incoming electrical supply must be protected against overloads and short circuits. It can operate with compatible electronic protection units and electrical accessories to provide the required protection and switching functions.
For replacement applications, engineers should verify the complete NW63H2 configuration, including pole arrangement, mounting type, rated current, breaking capacity, neutral position, and control unit requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | MT63H2 |
| Product Type | MasterPact Circuit Breaker Frame |
| Product Series | MasterPact NW |
| Circuit Breaker Configuration | NW63H2 |
| Circuit Breaker Type | Air Circuit Breaker |
| Rated Current | 6300 A |
| Number of Poles | 3P / 4P |
| Performance Level | H2 |
| Breaking Capacity | 150 kA at 440 V AC |
| Breaking Capacity at 525 V AC | 130 kA |
| Breaking Capacity at 690 V AC | 100 kA |
| Rated Operational Voltage | 690 V AC |
| Frequency | 50/60 Hz |
| Rated Insulation Voltage | 1000 V AC |
| Impulse Withstand Voltage | 12 kV |
| Short-Time Withstand Current | 100 kA for 1 s / 3 s |
| Mounting Type | Fixed / Drawout |
| Control Unit | Without Control Unit |
| Suitability for Isolation | Yes |
| Utilization Category | Category B |
| Dimensions | 422 × 300 × 352 mm |
| Weight | 50 kg |
Product Features
- 6300 A Current Rating: Supports high-capacity electrical distribution in large industrial power systems.
- H2 Breaking Performance: Provides a rated ultimate short-circuit breaking capacity of 150 kA at 440 V AC.
- Multiple Pole Configurations: Available in three-pole and four-pole arrangements for different distribution requirements.
- MasterPact NW Platform: Belongs to Schneider Electric’s high-current air circuit breaker family.
- Fixed and Drawout Options: Supports different switchgear installation arrangements.
- High Short-Time Withstand Capacity: Supports 100 kA short-time withstand current for specified operating durations.
- Isolation Capability: Suitable for electrical isolation according to applicable IEC 60947-2 requirements.
- Electronic Protection Compatibility: Can be combined with compatible Micrologic protection units according to the selected configuration.
Working Principle
The MasterPact NW63H2 operates as an air circuit breaker that controls the electrical connection between the incoming power supply and the downstream distribution system.
During normal operation, electrical current flows through the main contacts of the breaker to supply connected equipment. The contacts remain 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.
During contact separation, an electrical arc forms between the contacts. The air arc-extinguishing arrangement 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 150 kA at 440 V AC. At higher operating voltages, the specified breaking capacity changes according to the voltage rating.
Typical Protection Sequence:
Incoming Power Supply → MasterPact NW63H2 Circuit Breaker → Main Distribution Busbar → Downstream Feeder Circuits
After a fault interruption, the cause of the trip should be investigated before the breaker is reset and returned to service.
Role in Schneider MasterPact Power Distribution Architecture
The MT63H2 serves as a main or feeder circuit protection component within compatible MasterPact NW63H2 low-voltage distribution systems.
In large industrial switchgear installations, the circuit breaker is positioned between the incoming electrical supply and the main distribution busbar. It provides switching and fault interruption functions for high-current electrical circuits.
Its 6300 A rated current and H2 interruption performance make it suitable for installations with substantial electrical loads and high prospective short-circuit currents.
| System Component | Function |
|---|---|
| MT63H2 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 large production facility electrical supplies |
| Commercial Buildings | High-capacity low-voltage electrical distribution |
| Data Centers | Protecting large electrical distribution circuits |
| Power Distribution Rooms | Incoming and main feeder protection |
| Process Industries | Protecting electrical supplies for continuous production |
| Infrastructure Projects | Integrating high-capacity switchgear |
| Utility Installations | Main electrical distribution protection |
| Industrial Switchboards | Protecting high-current distribution busbars |
| Electrical Substations | Low-voltage feeder and distribution protection |
Installation and Maintenance
- Verify Model Configuration: Confirm that MT63H2 corresponds to the required MasterPact NW63H2 configuration, including rated current, breaking capacity, and pole arrangement.
- Check Switchgear Compatibility: Verify the mounting arrangement, neutral configuration, 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 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 |
|---|---|
| NW40H2 | Schneider MasterPact NW 4000 A H2 Air Circuit Breaker |
| NW50H2 | Schneider MasterPact NW 5000 A H2 Air Circuit Breaker |
| NW63H1 | Schneider MasterPact NW 6300 A H1 Air Circuit Breaker |
| NW63H2 | Schneider MasterPact NW 6300 A H2 Air Circuit Breaker |
| NW63H3 | Schneider MasterPact NW 6300 A H3 Air Circuit Breaker |
| NW63HA | Schneider MasterPact NW 6300 A HA Air Circuit Breaker |
Key Advantages
- 6300 A rated current for large-scale electrical distribution.
- H2 performance with 150 kA breaking capacity at 440 V AC.
- Three-pole and four-pole configuration options.
- Fixed and drawout installation arrangements.
- Supports overload and short-circuit protection.
- Compatible with the MasterPact NW protection and accessory ecosystem.
- Suitable for large industrial and commercial power distribution systems.
Technical FAQs
1. What is the rated current of the MT63H2?
The associated MasterPact NW63H2 configuration has a rated current of 6300 A at 40 °C. It is intended for high-capacity low-voltage distribution applications.
2. What is the short-circuit breaking capacity of the NW63H2?
The H2 configuration provides 150 kA ultimate short-circuit breaking capacity at 440 V AC, 130 kA at 525 V AC, and 100 kA at 690 V AC.
3. What is the difference between fixed and drawout NW63H2 configurations?
The fixed configuration is installed directly into the switchgear assembly. The drawout configuration uses a withdrawable mounting arrangement that allows the breaker to move between connected, test, and disconnected positions. The selected arrangement must match the switchgear design.
4. Does the MT63H2 include a Micrologic protection unit?
The specified configuration is without a control unit. A compatible Micrologic protection unit must be selected according to the required overload, short-circuit, and other protection functions.