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- MT50H2
- MasterPact Circuit Breaker Frame
- France
- 422 × 300 × 352 mm
- 50 kg
- Xiamen, China
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Product Overview
The Schneider MT50H2 MasterPact Circuit Breaker Frame is a high-capacity air circuit breaker frame associated with the MasterPact NW50H2 platform. It is used in low-voltage power distribution systems requiring high current capacity and substantial short-circuit interruption performance.
The NW50H2 configuration supports a rated current of 5000 A and belongs to the H2 breaking performance category. Its rated ultimate short-circuit breaking capacity reaches 150 kA at 440 V AC, making it suitable for demanding main distribution applications in industrial switchgear installations.
The MasterPact NW50H2 is intended for large electrical distribution systems where high-current incoming feeders and main busbar protection are required. It can be integrated into compatible switchgear assemblies and used with appropriate electronic protection and operating accessories.
The circuit breaker supports three-phase power distribution and provides switching, isolation, overload protection, and short-circuit interruption functions when equipped with the corresponding protection configuration.
For replacement applications, engineers should verify the complete NW50H2 configuration, including rated current, breaking capacity, pole arrangement, mounting type, neutral position, control unit, and electrical connection requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | MT50H2 |
| Product Type | MasterPact Circuit Breaker Frame |
| Product Series | MasterPact NW |
| Circuit Breaker Configuration | NW50H2 |
| Circuit Breaker Type | Air Circuit Breaker |
| Rated Current | 5000 A |
| Number of Poles | 3P |
| 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 |
| Mounting Type | Fixed |
| Control Unit | Without Control Unit |
| Suitability for Isolation | Yes |
| Utilization Category | Category B |
| Rated Insulation Voltage | 1000 V AC |
| Impulse Withstand Voltage | 12 kV |
| Short-Time Withstand Current | 100 kA for 1 s / 3 s |
| Maximum Breaking Time | 25 ms |
| Dimensions | 422 × 300 × 352 mm |
| Weight | 50 kg |
Product Features
- 5000 A Current Rating: Supports high-capacity electrical distribution in large industrial power systems.
- H2 Breaking Performance: Provides 150 kA ultimate short-circuit breaking capacity 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 family.
- Fixed Mounting Arrangement: Supports installation in compatible low-voltage switchgear assemblies.
- High Short-Time Withstand Capacity: Supports 100 kA short-time withstand current for up to 3 seconds under specified conditions.
- Isolation Capability: Supports electrical isolation according to applicable IEC 60947-2 requirements.
- Protection Unit Compatibility: Can be configured with compatible MasterPact electronic trip units.
Working Principle
The MasterPact NW50H2 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 to supply connected electrical equipment. The 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 configuration provides a rated ultimate short-circuit breaking capacity of 150 kA at 440 V AC. At 525 V AC, the corresponding value is 130 kA, while at 690 V AC it is 100 kA.
Typical Protection Sequence:
Incoming Power Supply → MasterPact NW50H2 Circuit Breaker → Main Distribution Busbar → Downstream Feeder Circuits
After a fault interruption, the cause of the trip should be investigated before resetting the breaker and returning it to service.
Role in Schneider MasterPact Power Distribution Architecture
The MT50H2 serves as a main or feeder circuit protection component in compatible MasterPact NW50H2 low-voltage distribution systems.
In a typical industrial switchgear arrangement, the circuit 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 5000 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 |
|---|---|
| MT50H2 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 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 MT50H2 corresponds to the required MasterPact NW50H2 configuration, including rated current, breaking capacity, and pole arrangement.
- Check Switchgear Compatibility: Verify the fixed 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 |
| NW50H1 | Schneider MasterPact NW 5000 A H1 Air Circuit Breaker |
| NW50H2 | Schneider MasterPact NW 5000 A H2 Air Circuit Breaker |
| NW50H3 | Schneider MasterPact NW 5000 A H3 Air Circuit Breaker |
| NW50HA | Schneider MasterPact NW 5000 A HA Air Circuit Breaker |
| NW60H2 | Schneider MasterPact NW 6000 A H2 Air Circuit Breaker |
Key Advantages
- 5000 A rated current for high-capacity power distribution.
- H2 performance with 150 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 large industrial and commercial electrical distribution systems.
Technical FAQs
1. What is the rated current of the MT50H2?
The associated MasterPact NW50H2 configuration has a rated current of 5000 A at 40 °C. This distinguishes it from the NW40H2, which has a rated current of 4000 A.
2. What is the short-circuit breaking capacity of the NW50H2?
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. Does the MT50H2 include an electronic 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.
4. What should be checked when replacing an MT50H2 circuit breaker?
Verify the 5000 A current rating, H2 breaking performance, three-pole arrangement, fixed mounting configuration, control unit requirements, and switchgear connection layout. The neutral configuration and accessory arrangement should also be checked.