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This is a Schneider EZD series 400A frame size, 3-pol, 250Un curent nominal, 36kA breaking capacity molded case circuit breaker. Its standard order number is EZD400E3250K. It is applied to overload and short-circuit protection in secondary power distribution systems, featuring cost performance and installation flexibility.
- Model Segment Definition
| Segmentul de model | Sens | Descriere |
| EZD | Seria de produse | Schneider EasyPact EZD molded case circuit breaker series, designed for secondary power distribution, civil buildings and electromechanical markets |
| 400 | Cadrul curent | 400A frame size, maximum rated current up to 400A |
| E | Breaking Capacity Class | Clasa E, 36kA @ 400V AC, suitable for general industrial and civil building power distribution |
| 3P | Numărul de pol | 3-pol, three-phase three-wire system |
| 250O | Curent nominal | Thermal-magnetic trip unit rated current 250A with fixed protection setting values |
| K | Tip de montare | Tip fix / conexiune frontală (standard); PK means plug-in type |
- Core Specification Parameter Table
| Categoria parametrilor | Specificație detaliată | Observații |
| Parametrii de bază | ||
| Marca & Model | Schneider EZD400E3250K | Standard order number |
| Tensiune nominală | 400V și (Max. 690V și) | 50/60Hz |
| Tensiune nominală de izolație | 1000V și | Conform IEC 60947-2 |
| Curent nominal (În) | 250O | Thermal-magnetic trip TM250D |
| Numărul de pol | 3P | Three-phase three-wire |
| Capacitate de rupere (Icu) | 36kA @ 400V AC | Class E breaking capacity |
| Caracteristici de protecție | ||
| Tip unitate de deplasare | Termo-Magnetic (TMD) | Long time delay for overload + instantaneous short-circuit protection |
| Protecție la suprasarcină | 1.05În: No tripping continuously | Conform IEC 60947-2 |
| 1.30În: Tripping within ≤1 hour | ||
| 6.00În: Tripping within ≤2 seconds | ||
| Short-circuit Protection | Instant trip at ≥10In | Protect lines and equipment from overload and short-circuit damage |
| Mechanical & Parametrii de instalare | ||
| Tip de montare | Fix (Standard) / Plug-in optional | Upper/lower incoming line interchangeable without derating |
| Metoda de cablare | Front wiring (Standard) | Rear wiring and plug-in wiring optional |
| Modul de operare | Operare manuală (Handle) | Ergonomic design, labor-saving operation |
| Dimensiunea de ansamblu (L×A×D) | 140×255×110 mm | Standard dimension for 400A frame |
| Greutate | Aproximativ. 4.5 kg | |
| Mounting Position | Vertical / Orizontală / Side / Rear | Performance unaffected by mounting position |
| Parametrii de mediu | ||
| Temperatura de operare | -5℃ ~ +40℃ | Derate above 40℃ |
| Temperatura de depozitare | -25℃ ~ +70℃ | |
| Protection Degree | IP30 (Body only) | IP40 with protective cover |
| Certificare | ||
| Standard Compliance | IEC 60947-2, GB 14048.2 | 3C Certificate No.: 2020980307… |
- Accessory List (Compatible with EZD400 Series)
| Accessory Type | Model / Comanda nr. | Descrierea funcției |
| Contact auxiliar | EZ4OF101 (Single Auxiliary) | Indicate breaker ON/OFF status (OF), 1NO/1NC or 2NO/2NC |
| EZ4OF201 (Dual Auxiliary) | ||
| Contact de alarmă | EZ4SD101 (Single Alarm) | Indicate breaker tripping status (SD), including fault and non-fault tripping |
| EZ4SD201 (Dual Alarm) | ||
| Shunt Trip | EZ4SHT200ACDCZ (AC220V) | Remote trip control, fire emergency trip application |
| EZ4SHT400ACZ (AC380V) | ||
| EZ4SHT048ACDCZ (DC24V) | ||
| Undervoltage Release | EZ4MN200ACZ (AC220V) | Automatic trip when voltage below set value, protect equipment from over/undervoltage damage |
| EZ4MN400ACZ (AC380V) | ||
| Extended Rotary Handle | EZ4H100 | Convenient door operation, suitable for distribution cabinet installation |
| Interphase Barrier | EZ4SP400 | Enhance interphase insulation and safety |
| Busbar | Dedicated busbar system | Suitable for multi-circuit outgoing lines, easy installation and neat layout |
| Baza plug-in | EZ4B400 | Adapt to plug-in mounting for easy maintenance and replacement |
- Alternativă & Cross-Brand Comparison
4.1 Schneider Internal Series Replacement
| Serie | Model | Capacitate de rupere | Tip de călătorie | Gama de prețuri | Scenariul aplicației |
| EZD | EZD400E3250K | 36cel | Termo-Magnetic | Medium-Low | General power distribution, cost priority |
| CVS | CVS400N3250 | 50cel | Termo-Magnetic / Electronic | Mediu | Industrial distribution, higher breaking capacity required |
| NSX | NSX400N3250 | 50cel / 70cel | Electronic (Micrologic) | Ridicat | High-end distribution, precise protection and communication required |
4.2 Cross-Brand Competitor Comparison
| Marca | Model | Cadru / Curent nominal | Capacitate de rupere | Price Ratio | Caracteristici |
| Chint | NXM-400S/3300 250A | 400O / 250O | 36cel | Despre 60% of EZD | Domestic alternative, performanță la costuri ridicate |
| ABB | Tmax T4N250 | 400O / 250O | 50cel | Despre 120% of EZD | Strong breaking capacity, performanță stabilă |
| Siemens | 3VT400N250 | 400O / 250O | 36cel | Despre 110% of EZD | Compatible with Siemens system, funcții complete de comunicare |
| Comutator Changshu | CM3-400M/3300 250A | 400O / 250O | 36cel | Despre 70% of EZD | High-quality domestic brand, good compatibility |
- Puncte cheie ale selecției & Soluții alternative
5.1 Core Selection Guidelines
Load Type Matching
Distribution Protection: EZD400E series (thermal-magnetic), potrivite pentru iluminat, socket and non-motor loads
Protecția motorului: Recommend EZD400M series (motor protection type with higher short-circuit trip multiple)
Protecție cu curent rezidual: Adopt VigiEZD400E series with integrated residual current protection
Selectarea capacității de rupere
36cel (Clasa E): General industrial & civil buildings with low short-circuit current
50cel (Class M): Industrial environments with high short-circuit current, such as near inverters and large motors
Calculation Rule: Select proper breaking capacity based on system short-circuit current calculation
Mounting Type Decision
Fixed Type: Low cost, for circuits without frequent replacement
Plug-in Type: Easy maintenance, for important circuits requiring quick replacement (data center, hospital)
5.2 Recommended Alternative Solutions
| Scenariu | Recommended Solution | Avantaje |
| Budget Limited, General Distribution | Chint NXM-400S/3300 250A | Low price, meets basic performance requirements |
| High Breaking Capacity Required (50cel) | Schneider CVS400N3250 | Same-brand upgrade, installation dimension compatible, capacitate de rupere mai mare |
| Precise Protection & Communication Needed | Schneider NSX400N3250 + Micrologic 2.3 | Electronic trip with adjustable parameters, support Modbus communication |
| Residual Current Protection Needed | VigiEZD400E3250K | Integrated residual current protection, save space without extra module |
| Remote Control Needed | EZD400E3250K + Shunt Trip + Contact auxiliar | Realize remote tripping and status monitoring, fit intelligent distribution system |
- Key Operation Precautions
- Derating Application: Derate rated current by 1% per 1℃ above 40℃; derate by 0.5% per 100m altitude over 1000m.
- Specificații de cablare: Follow top-in bottom-out rule; fasten terminals to avoid overheating. 3P for three-phase three-wire; select 4P if neutral protection is needed.
- Instalarea accesoriilor: Auxiliary/alarm contacts, shunt/undervoltage releases can be field-installed; cut off power before installation for safety.
- Ciclul de întreținere: Inspect every 6 months including appearance, mechanism flexibility and terminal tightness.
- Tratarea defecțiunilor: După ce se împiedică, identify cause (overload/short-circuit), eliminate fault then close again.
Complete Model List of Schneider EZD Series Circuit Breakers
Overview: The EZD series covers 5 dimensiunile cadrului (100A/160A/250A/400A/630A), 3 breaking classes (E=25kA, N=36kA, M=50kA), 2 pole types (3P/4P), 2 trip types (TMD thermal-magnetic / ETU electronic; electronic only for 630A frame), 2 mounting types (Fixed N / Plug-in PK), plus residual current type (VigiEZD) and motor protection type (MA) variants.
- Model Naming Rule (Esenţial)
| Segmentul de model | Sens | Optional Value | Descriere |
| EZD | Seria de produse | EZD | EasyPact EZD molded case circuit breaker series |
| 100/160/250/400/630 | Cadrul curent | 100/160/250/400/630 | Maximum rated current capacity |
| E/N/M | Capacitate de rupere | E(25cel), N(36cel), M(50cel) | Ultimate breaking capacity @400V AC |
| 3-4 | Numărul de pol | 3(3P), 4(4P) | 3P=3-phase 3-wire; 4P=3-phase 4-wire |
| 0XX/XX0 | Curent nominal | 15~630A | Rated current of thermal-magnetic trip unit |
| N/PK | Tip de montare | N(Fix), PK(Plug-in) | Fixed as standard; PK for plug-in |
| MA | Application Type | MA(Protecția motorului) | Non-MA for distribution protection |
| EL/ELA | Residual Current | EL(30mA), ELA(300mA) | Exclusive for VigiEZD series |
- Complete Model List by Frame Size
2.1 EZD100 Frame (Max. 100O)
2.2 EZD160 Frame (Max. 160O)
2.3 EZD250 Frame (Max. 250O)
2.4 EZD400 Frame (Max. 400O)
2.5 EZD630 Frame (Max. 630O, with Electronic Trip)
- Residual Current Protected Type (VigiEZD Series)
- Key Selection Instructions
- Common Model Quick Reference (Distribution Protection)
- Accessory Compatibility Guide
