Contattore,interruttore automatico,inverter solare,contatore elettrico,batterie solari
The NM1-400S/3000 400A is a 3-pole interruttore automatico scatolato manufactured by CHINT Electric. As a standard type (S) product in the NM1 series, it has a rated current of 400A and is designed for overload, cortocircuito, and undervoltage protection in power distribution systems.
- Model Designation Explanation
NM1: CHINT NM1 series molded case circuit breaker
400: Frame size rated current of 400A (the maximum current rating in this series)
S: Breaking capacity characteristic code (standard type with a breaking capacity of 50kA)
3000: Numero del polo + release type + accessory configuration
First digit “3”: 3-palo (trifase) progetto
“000”: Indicates no accessories (no auxiliary contacts, no alarm contacts, no shunt release)
400UN: Rated operating current of 400A (the maximum current for long-term stable operation)
- Parametri fondamentali e prestazioni
| Elemento parametro | Valore | Descrizione |
| Tensione di isolamento nominale | 800V | Maximum withstand voltage for insulation |
| Tensione operativa nominale | 690V (CA 50 Hz) | Standard voltage suitable for three-phase systems |
| Corrente nominale | 400UN | Maximum current for long-term stable operation |
| Capacità di interruzione | 50IL | Maximum short-circuit current that can be safely interrupted |
| Distanza dell'arco elettrico | ≤100mm | Arc ejection distance during short-circuit breaking |
| Tipo di rilascio | Magnetotermico | Provides both thermal protection (sovraccarico) and magnetic protection (cortocircuito) |
| Funzioni di protezione | Sovraccarico, cortocircuito, sottotensione | Comprehensive circuit protection |
| Metodo operativo | Manuale (configurazione standard) | Electric operating mechanism is optional |
| Grado di protezione | IP20 | Previene l'intrusione di corpi estranei solidi di dimensioni superiori a 12 mm |
| Metodo di montaggio | Front/back panel wiring (opzionale) | Flexible installation methods |
| Peso | Approximately 6.8kg (4-pole reference) | Peso netto del prodotto |
III. Appearance and Structural Features
Materiale dell'alloggiamento: High-strength thermoplastic with properties of impact resistance, self-extinguishing, and heat resistance
Operating Handle: Located in the center of the front face of the circuit breaker; red indicates open position, green indicates closed position
Morsettiere: 3 sets of input/output terminals (corresponding to three phases), equipped with M12 hexagon socket screws (coppia: 26N·m)
Dimension Reference:
– Larghezza: Approximately 128mm (3-palo)
– Altezza: Approximately 257mm (reference to similar products)
– Profondità: Circa 150 mm (reference to similar products)
Internal Structure:
Arc Extinguishing Chamber: Adopts multi-stage arc extinguishing technology to quickly extinguish arcs and protect equipment safety
Thermal-magnetic Release: Composed of thermal elements (strisce bimetalliche) and electromagnetic elements (bobine), which detect overload and short-circuit currents respectively
- Scenari applicativi tipici
- Sistemi di distribuzione dell'energia industriale:
– Main switch of power distribution boxes in factory workshops
– Power supply protection for large-scale equipment (per esempio., motori, tifosi, pompe dell'acqua)
- Edifici commerciali:
– Floor power distribution boxes in shopping malls and office buildings
– Power supply protection for large electrical equipment such as air conditioning systems and elevators
- Infrastructure Facilities:
– Power distribution systems in public buildings like hospitals and schools
– Protezione dell'uscita UPS nei data center
- Precauzioni per l'uso
- Requisiti di installazione:
– Install vertically and reserve sufficient heat dissipation space (≥10cm)
– Install arc baffles (configurazione standard) to prevent phase-to-phase short circuits
– Ensure the conductor cross-sectional area is ≥400mm² (for copper busbars) or ≥370mm² (for copper wires) durante il cablaggio
- Funzionamento e manutenzione:
– Regularly check for overheating and deformation of contacts
– Clean internal dust every six months (operate after power-off)
– Periodically test protection functions with professional testing equipment
- Suggerimenti per la sicurezza:
– Inspect contact conditions after interrupting fault currents; sostituire se necessario
– Strictly prohibit wiring or replacement operations under load conditions
– Confirm that the circuit is completely de-energized before conducting maintenance after the circuit breaker is opened
- Optional Accessories for Function Expansion
The functions of the NM1-400S/3000 circuit breaker can be expanded by installing accessories:
| Tipo di accessorio | Espansione delle funzioni |
| Contatti ausiliari | Provide circuit breaker status signals (open/closed) per il monitoraggio remoto |
| Contatti di allarme | Send alarm signals when the circuit breaker trips due to faults |
| Rilascio dello shunt | Enable remote control of circuit breaker opening (per esempio., for fire protection linkage) |
| Rilascio di sottotensione | Automatically trip when the power supply voltage drops below the set value |
| Meccanismo di comando elettrico | Realize electric closing/opening, suitable for remote control or frequent operation scenarios |
The NM1-400S/3000 400A is a reliable 3-pole molded case circuit breaker with a high breaking capacity of 50kA and thermal-magnetic release protection. It is suitable for various industrial and commercial power distribution systems. Its standard configuration (senza accessori) meets basic protection needs, and it can achieve function expansion by selecting different accessories to satisfy more complex system protection and monitoring requirements.
