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Panoramica del prodotto & Ripartizione del modello
C125N420FM is a 4‑pole molded case circuit breaker from Schneider Electric’s ComPacT NS1250N series, equipped with a MicroLogic 2.0 control unit.
It is used for overload and short‑circuit protection in low‑voltage power distribution systems, widely applied in industrial plants, edifici commerciali, and infrastructure projects.
| Segmento modello | Descrizione |
| C125N | ComPacT NS1250N series, frame size 1250A, breaking capacity 50kA@415VAC |
| 4 | 4‑pole configuration (4P) |
| 20 | MicroLogic 2.0 control unit (funzioni di protezione di base) |
| FM | Fixed mount, manual operation, collegamento frontale |
- Specifiche tecniche principali
| Articolo | Valore | Note |
| Modello | Schneider Electric C125N420FM | Full description: ComPacT NS1250N 4P 1250A 50kA MIC2.0 |
| Corrente del fotogramma | 1250UN | Maximum rated operational current |
| Poli | 4 poli (4P) | 3 fasi + protezione neutra |
| Unità di sgancio | MicroLogic 2.0 | Long‑time (l), di breve durata (S), istantaneo (IO) protezione |
| Corrente nominale (E) | 1250UN | Adjustable via trip unit |
| Capacità di interruzione massima (terapia intensiva) | 50kA@415VAC | Conforme alla norma IEC 60947‑2 |
| Montaggio | Fisso, collegamento frontale | Suitable for standard switchgear |
| Operazione | Manuale | With mechanical indication and lockability |
| Tensione di isolamento nominale (Ui) | 1000VCA | IEC 60947‑2 |
| Tensione operativa nominale (Ue) | 400/415VCA (50Hz) | Standard 3‑phase voltage |
| Corrente di breve durata (Icw/1s) | 50IL | Ensures system stability during faults |
| Grado di protezione | IP30 | Protezione contro corpi estranei solidi |
| Capacità di cablaggio | Massimo. 300mm² di rame | For high‑current loads |
- Caratteristiche & Vantaggi
- Protezione completa
MicroLogic 2.0 provides 3‑stage protection (L‑S‑I) with adjustable settings.
Supports fault diagnostics and alarm output for easy maintenance.
- Efficient design
Green “T” design reduces panel wiring time by 40%.
Ergonomic operating handle for improved safety and comfort.
Modular structure supports accessories: contatti ausiliari, contatti di allarme, sganciatore di minima tensione, ecc.
- Reliable performance
50kA high breaking capacity for fast fault interruption.
Vita meccanica: fino a 10,000 operazioni; vita elettrica: fino a 5,000 operazioni.
Temperatura ambiente: −5°C to +40°C (full rating), −25°C to +70°C (derated).
- Installazione & Applicazioni
4.1 Requisiti di installazione
Suitable for standard distribution boards with industry‑standard mounting depth.
Front connection for easy wiring and maintenance.
Sufficient heat dissipation space required for stable long‑term operation.
4.2 Applicazioni tipiche
Incoming protection for main power distribution boards in industrial plants
Power distribution systems for large commercial complexes
UPS input/output protection in data centers
Critical load protection in infrastructure (ospedali, aeroporti, metros)
Main protection for Motor Control Centers (Centro clienti)
- Modelli correlati & Alternative
5.1 Derived models in the same series
| Modello | Differenza | Applicazione |
| C125N320FM | 3 poli (3P) | 3‑phase loads without neutral protection |
| C125N450FM | MicroLogic 5.0 trip unit | Energy measurement and advanced protection |
| C125N420PM | Draw‑out installation | Easy maintenance without power interruption |
| C125N420RM | Plug‑in installation | Fast replacement for backup equipment |
5.2 Cross‑series alternatives
| Sostituzione | Serie | Main difference | Riferimento del prezzo |
| NSX1250N 4P MIC2.0 | ComPacT NSX | Nuova generazione, potere di interruzione 65kA | ca. +10% |
| Masterpact MTZ12 | Masterpact MTZ | Air circuit breaker for higher power systems | ca. +50% |
5.3 Competitive brand equivalents
| Marca | Sostituzione | Valutazione |
| Siemens | 3WL1212‑3CB36‑4GA4 | 1250A 4P 50kA basic protection |
| ABB | Tmax T6H1250 PR221DS‑LSI 4P | 1250A 4P 50kA LSI protection |
| Eaton | NZM4‑1250N 4P | 1250A 4P 50kA basic protection |
- Acquisto & Suggerimenti per l'uso
- Authentic procurement: Purchase via authorized Schneider Electric distributors or official channels to ensure quality and service.
- Accessori: Optional auxiliary contacts, contatti di allarme, viaggio di derivazione, sganciatore di minima tensione, ecc.
- Impostazione dei parametri: MicroLogic 2.0 can be programmed; adjust according to load characteristics.
- Manutenzione: Routine inspection every 1–2 years, including mechanism, terminali, and protection functions.
> Nota: C125N420FM complies with IEC 60947‑2, GB 14048.2 and other international & national standards. It is fully compatible with Schneider Prisma E, Blokset and other panel systems.
- Selezione & Linee guida per la sostituzione
- Compatibility Rules
Industrial relay sockets follow international standard dimensions and are interchangeable across brands if:
Pin count matches relay pole number
Corrente nominale (≥10A) meets load
Montaggio (DIN-rail/screw) matches panel design
- Terminal Type Selection
Conventional screw: PTF08A / PTF11A / PTF14A-suitable for low-vibration environments
Finger protection: PTFZ series-suitable for areas with frequent access
Push-In Plus: PTF-PU series-ideal for mass wiring, elevata resistenza alle vibrazioni
- Modelli fuori produzione
PTF08A-E / PTF14A-E are discontinued with limited stock.
Use PTFZ series as the preferred replacement.
> Nota: PTF series sockets are rated 10A/250VAC, dielectric strength AC 2000V, operating temp −25 °C to +55 °C, suitable for 0.5–2.5 mm² copper wires.
