Schneider Electric MT25N1 – 250A Air Circuit Breaker | Masterpact Series
Engineering Background: The Schneider Electric Masterpact MT series represents the benchmark in low-voltage air circuit breaker technology, engineered for demanding industrial and commercial power distribution environments. The MT25N1 is a 250A frame, 3-pole, fixed-mounted ACB designed to provide reliable overcurrent and short-circuit protection in main distribution boards, motor control centers (MCCs), and critical infrastructure panels.
Product Positioning: Konmask.com supplies the MT25N1 as a verified OEM component sourced through authorized Schneider Electric distribution channels. This unit is the preferred choice for procurement engineers specifying protection devices in IEC 60947-2 compliant switchgear assemblies across power generation, manufacturing, data centers, and building automation systems.
Complete Technical Specifications
- Part Number / SKU: MT25N1
- Manufacturer: Schneider Electric
- Series / Platform: Masterpact MT
- Type: Air Circuit Breaker (ACB), Fixed Mount
- Rated Current (In): 250 A
- Poles: 3P (Three-Pole)
- Rated Voltage (Ue): 690 V AC / 250 V DC
- Rated Insulation Voltage (Ui): 1000 V
- Rated Impulse Withstand Voltage (Uimp): 12 kV
- Frequency: 50/60 Hz
- Breaking Capacity (Icu @ 415V): 50 kA
- Service Breaking Capacity (Ics): 100% Icu
- Trip Unit: Electronic (Micrologic compatible)
- Protection Functions: Overload (L), Short-circuit (S/I), Ground fault (G) – trip unit dependent
- Mounting: Fixed (non-withdrawable)
- Standards: IEC 60947-2, CE, RoHS
- Degree of Protection: IP40 (front face, door-mounted)
- Operating Temperature: -25°C to +70°C
- Weight: Approx. 2.1 kg
- Country of Origin: China (Schneider Electric manufacturing facility)
Proven Application Environments
- Main Low-Voltage Distribution Boards (LVDB) and Sub-Main Panels
- Motor Control Centers (MCC) – feeder and incomer protection
- Industrial Manufacturing Plants – CNC, press, and conveyor systems
- Data Centers and UPS bypass switchgear
- Commercial Buildings – HVAC, elevator, and lighting distribution
- Power Generation – generator incomer and bus-tie applications
- Oil & Gas and Petrochemical facilities (non-hazardous zones)
- Water Treatment and Pumping Stations
Engineering Advantages
- High Breaking Capacity: 50 kA Icu ensures protection in high fault-current environments without replacement after tripping.
- Electronic Trip Unit: Micrologic-compatible trip unit enables precise, adjustable protection curves (L, S, I, G) to match system coordination requirements.
- Compact Fixed Design: Optimized footprint for panel space efficiency; ideal for retrofit and new-build switchgear.
- IEC 60947-2 Compliance: Fully certified for international project specifications and third-party inspection requirements.
- Long Service Life: Rated for 10,000+ mechanical operations and 3,000+ electrical operations at rated current.
- Schneider Ecosystem Integration: Compatible with Masterpact MT accessories – auxiliary contacts, shunt trips, undervoltage releases, and communication modules (Modbus, Profibus).
System Architecture & Signal Flow
In a typical low-voltage distribution architecture, the MT25N1 is installed as an incomer or feeder ACB at the main distribution board (MDB) level. Power flows from the upstream transformer or generator → MT25N1 incomer ACB → busbar → downstream MCCBs or MCBs protecting individual circuits. The electronic trip unit continuously monitors current on all three phases; upon detecting an overload or fault condition exceeding the set threshold, the trip mechanism opens all poles simultaneously within milliseconds, isolating the fault without affecting upstream supply. Optional communication modules allow real-time monitoring via SCADA or BMS systems.
Sourcing & Quality Verification
- OEM Authenticity: All MT25N1 units supplied by Konmask.com are sourced from verified Schneider Electric authorized distributors. Each unit includes original manufacturer packaging, serial number, and CE/IEC certification markings.
- Inspection Protocol: Units undergo incoming inspection including visual check, nameplate verification, and continuity testing prior to dispatch.
- Traceability: Full supply chain documentation available upon request – including distributor invoice, manufacturer certificate of conformity (CoC), and test reports.
- Anti-Counterfeit: Schneider Electric holographic labels and QR verification codes are intact on all supplied units. Buyers are encouraged to verify authenticity via Schneider’s official product verification portal.
Procurement Process
- Step 1 – Inquiry: Submit your BOM or project specification to support@konmask.com with required quantity, delivery timeline, and destination port.
- Step 2 – Quotation: Receive a formal quotation within 24 business hours including unit price, lead time, and shipping options (DHL, FedEx, sea freight).
- Step 3 – Order Confirmation: Confirm PO with agreed Incoterms (EXW, FOB Xiamen, CIF). Payment via T/T, L/C, or PayPal for small orders.
- Step 4 – Dispatch & Documentation: Shipment with full export documentation – commercial invoice, packing list, certificate of origin, and CoC.
- Step 5 – After-Sales Support: Technical support available post-delivery for installation guidance, parameter setting, and warranty claims.
Technical FAQ
Q: What is the difference between MT25N1 and MT25H1?
A: The suffix N denotes “Normal” breaking capacity (50 kA), while H denotes “High” breaking capacity (65–85 kA). Select based on your system’s prospective short-circuit current (PSCC) at the installation point.
Q: Can the MT25N1 be upgraded to withdrawable type?
A: No. The MT25N1 is a fixed-mount unit. For withdrawable (plug-in) applications, specify the MTZ2 or Masterpact NW series with drawout chassis.
Q: Is the Micrologic trip unit field-replaceable?
A: Yes. Micrologic trip units are modular and can be replaced or upgraded in the field without replacing the entire breaker frame.
Q: What accessories are compatible with MT25N1?
A: Compatible accessories include: auxiliary contacts (OF, SD, SDE), shunt trip (MX), undervoltage release (MN/MX), rotary handle, door-coupling mechanism, and Modbus/Profibus communication modules.
Q: What is the lead time for MT25N1?
A: Standard stock items ship within 3–5 business days. For large quantities (>10 units), lead time is 7–15 business days depending on availability. Contact us for real-time stock status.
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