Schneider Electric NSX250N (LV431630) – Fixed Moulded Case Circuit Breaker | Compact NSX Series
Engineering Background: The Schneider Electric Compact NSX platform is one of the most widely deployed moulded case circuit breaker (MCCB) families in global industrial and commercial power distribution. Engineered to IEC 60947-2 standards, the NSX range delivers precise overcurrent protection, high breaking capacity, and modular accessory compatibility — making it the reference choice for panel builders, OEMs, and MV/LV switchgear integrators worldwide.
Product Positioning: The NSX250N / LV431630 is a 250A fixed-mount MCCB rated at 50kA breaking capacity (415V AC). It is purpose-built for main distribution boards, motor control centers (MCCs), and industrial feeder protection where space efficiency, reliability, and IEC compliance are non-negotiable. Konmask.com supplies this unit as verified OEM stock with full traceability documentation available on request.
Complete Technical Specifications
| Part Number | NSX250N / LV431630 |
| Brand | Schneider Electric |
| Series | Compact NSX |
| Type | Fixed Moulded Case Circuit Breaker (MCCB) |
| Rated Current (In) | 250A |
| Rated Voltage (Ue) | 690V AC / 500V DC |
| Rated Insulation Voltage (Ui) | 750V |
| Rated Impulse Withstand Voltage (Uimp) | 8kV |
| Breaking Capacity (Icu @ 415V) | 50kA |
| Service Breaking Capacity (Ics) | 100% Icu |
| Poles | 3P |
| Mounting Type | Fixed (Non-withdrawable) |
| Trip Unit | TM-D (Thermal-Magnetic) |
| Standards | IEC 60947-2, EN 60947-2 |
| Degree of Protection | IP40 (front face) |
| Operating Temperature | -25°C to +70°C |
| Weight | 1.43 kg |
| HS Code | 8536.20.00 |
| Country of Origin | China (CN) |
Proven Application Environments
- Main Distribution Boards (MDB): Feeder and incomer protection in LV switchgear panels up to 415V AC.
- Motor Control Centers (MCC): Motor branch circuit protection for drives, pumps, compressors, and conveyors.
- Industrial Machinery: Machine tool panels, packaging lines, and process automation cabinets.
- Commercial Buildings: Riser boards, tenant distribution, and HVAC feeder protection.
- Data Centers & Utilities: Critical power distribution requiring high Ics and IEC-certified performance.
- Marine & Offshore: Suitable for harsh environments with appropriate enclosure selection.
Engineering Advantages
- High Breaking Capacity: 50kA Icu at 415V AC with 100% Ics — no derating required for service conditions.
- Compact Footprint: NSX250 frame occupies minimal DIN rail / busbar space, enabling high-density panel design.
- Modular Accessory Ecosystem: Compatible with Schneider Electric auxiliary contacts, shunt trips, undervoltage releases, and rotary handles — all field-installable without tools.
- Thermal-Magnetic Trip Unit (TM-D): Adjustable overload (Ir) and short-circuit (Im) settings provide precise coordination with upstream/downstream devices.
- IEC 60947-2 Certified: Globally accepted certification simplifies export compliance and third-party panel approval.
- Long Service Life: Rated for 25,000 mechanical operations and 10,000 electrical operations at rated current.
System Architecture & Signal Flow
In a typical LV distribution architecture, the NSX250N is deployed as a feeder circuit breaker downstream of the main incomer (typically NSX400/630 or ACB). The thermal-magnetic trip unit monitors line current continuously:
- Overload Protection (L): Bimetallic element responds to sustained overcurrents (Ir = 0.7–1× In), tripping after a time-delay inversely proportional to fault magnitude.
- Short-Circuit Protection (I): Magnetic instantaneous release operates at Im (typically 5–10× In) within milliseconds, limiting let-through energy (I²t) to protect downstream equipment.
- Accessory Integration: Shunt trip (MX) or undervoltage release (MN) coils can be wired to SCADA/PLC digital outputs for remote tripping and monitoring.
Sourcing & Quality Verification
- OEM Verified Stock: All NSX250N units supplied by Konmask.com are sourced through authorized distribution channels with full batch traceability.
- Inspection Protocol: Each unit undergoes visual inspection, label verification (CE marking, IEC rating plate), and packaging integrity check prior to dispatch.
- Documentation Available: CE Declaration of Conformity, IEC test reports, and product datasheets available upon request for panel certification purposes.
- Anti-Counterfeit: Schneider Electric holographic labels and QR-code verification supported. Buyers are encouraged to verify via Schneider’s official product authentication portal.
Procurement Process
- Step 1 — Inquiry: Submit your BOM or quantity requirement via email to [email protected] or WhatsApp +0086 19859288691.
- Step 2 — Quotation: Receive a formal quotation with unit price, lead time, and shipping options within 24 business hours.
- Step 3 — Order Confirmation: Place order via this product page or via proforma invoice for bank transfer / L/C payment.
- Step 4 — Dispatch: Orders are dispatched within 1–3 business days. DHL / FedEx / sea freight options available for international shipments.
- Step 5 — After-Sales: 12-month warranty on all OEM products. Technical support available from our engineering team.
Technical FAQ
Q: What is the difference between NSX250N and NSX250F / NSX250H?
A: The suffix denotes breaking capacity: F = 36kA, N = 50kA, H = 70kA, S = 100kA at 415V AC. Select based on your prospective short-circuit current (Icc) at the installation point.
Q: Can the fixed version be upgraded to withdrawable?
A: No. Fixed and withdrawable (plug-in/drawout) versions use different chassis. Specify the mounting type at the time of order.
Q: Is LV431630 the same as NSX250N?
A: Yes. LV431630 is the Schneider Electric commercial reference (catalog number) for the NSX250N 3P fixed MCCB with TM-D trip unit. Both references identify the same product.
Q: What accessories are compatible?
A: The NSX250 frame accepts OF (auxiliary contact), SD (fault signal contact), MX (shunt trip), MN (undervoltage release), and rotary handle kits. All accessories are ordered separately.
Q: What is the recommended upstream protection?
A: For discrimination (selectivity), pair with an upstream Schneider NSX400N/H or Masterpact MTZ as the incomer, following Schneider’s coordination tables (document reference: LVPED108001EN).
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