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This is a Schneider EZD series 400A frame size, 3-pólo, 250Uma corrente 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
| Segmento de modelo | Significado | Descrição |
| EZD | Série de produtos | Schneider EasyPact EZD molded case circuit breaker series, designed for secondary power distribution, civil buildings and electromechanical markets |
| 400 | Quadro atual | 400A frame size, maximum rated current up to 400A |
| E | Classe de Capacidade de Quebra | Class E, 36kA @ 400V AC, suitable for general industrial and civil building power distribution |
| 3P | Número do pólo | 3-pólo, three-phase three-wire system |
| 250UM | Corrente nominal | Thermal-magnetic trip unit rated current 250A with fixed protection setting values |
| K | Tipo de montagem | Tipo fixo / conexão frontal (padrão); PK means plug-in type |
- Core Specification Parameter Table
| Categoria de parâmetro | Especificação detalhada | Observações |
| Parâmetros Básicos | ||
| Marca & Modelo | Schneider EZD400E3250K | Standard order number |
| Tensão nominal | 400V e (Máx.. 690V e) | 50/60Hz |
| Tensão nominal de isolamento | 1000V e | Compatível com IEC 60947-2 |
| Corrente nominal (Em) | 250UM | Thermal-magnetic trip TM250D |
| Número do pólo | 3P | Three-phase three-wire |
| Quebrando Capacidade (UTI) | 36kA @ 400V AC | Class E breaking capacity |
| Características de proteção | ||
| Tipo de unidade de viagem | Thermal-Magnetic (DTM) | Long time delay for overload + proteção instantânea contra curto-circuito |
| Proteção contra sobrecarga | 1.05Em: No tripping continuously | Compatível com IEC 60947-2 |
| 1.30Em: Tripping within ≤1 hour | ||
| 6.00Em: Tripping within ≤2 seconds | ||
| Proteção contra curto-circuito | Instant trip at ≥10In | Protect lines and equipment from overload and short-circuit damage |
| Mecânico & Parâmetros de instalação | ||
| Tipo de montagem | Fixo (Padrão) / Plug-in optional | Upper/lower incoming line interchangeable without derating |
| Método de fiação | Front wiring (Padrão) | Rear wiring and plug-in wiring optional |
| Modo de operação | Operação manual (Handle) | Ergonomic design, labor-saving operation |
| Overall Dimension (L×A×P) | 140×255×110 mm | Standard dimension for 400A frame |
| Peso | Aprox.. 4.5 kg | |
| Posição de montagem | Vertical / Horizontal / Lado / Traseira | Performance unaffected by mounting position |
| Parâmetros Ambientais | ||
| Temperatura operacional | -5℃ ~ +40 ℃ | Derate above 40℃ |
| Temperatura de armazenamento | -25℃ ~ +70 ℃ | |
| Grau de Proteção | IP30 (Body only) | IP40 with protective cover |
| Certificação | ||
| Conformidade Padrão | CEI 60947-2, GB 14048.2 | 3C Certificate No.: 2020980307… |
- Lista de acessórios (Compatible with EZD400 Series)
| Accessory Type | Modelo / Número do pedido. | Descrição da função |
| Contato Auxiliar | EZ4OF101 (Single Auxiliary) | Indicate breaker ON/OFF status (OF), 1NO/1NC or 2NO/2NC |
| EZ4OF201 (Dual Auxiliary) | ||
| Contato de alarme | EZ4SD101 (Single Alarm) | Indicate breaker tripping status (SD), including fault and non-fault tripping |
| EZ4SD201 (Dual Alarm) | ||
| Viagem de manobra | EZ4SHT200ACDCZ (AC220V) | Remote trip control, fire emergency trip application |
| EZ4SHT400ACZ (AC380V) | ||
| EZ4SHT048ACDCZ (CC24V) | ||
| Liberação de subtensão | 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 |
| Plug-in Base | EZ4B400 | Adapt to plug-in mounting for easy maintenance and replacement |
- Alternativa & Comparação entre marcas
4.1 Schneider Internal Series Replacement
| Série | Modelo | Quebrando Capacidade | Tipo de viagem | Faixa de preço | Cenário de aplicação |
| EZD | EZD400E3250K | 36o | Thermal-Magnetic | Medium-Low | General power distribution, cost priority |
| CVS | CVS400N3250 | 50o | Thermal-Magnetic / Eletrônico | Médio | Industrial distribution, higher breaking capacity required |
| NSX | NSX400N3250 | 50o / 70o | Eletrônico (Micrológico) | Alto | High-end distribution, precise protection and communication required |
4.2 Cross-Brand Competitor Comparison
| Marca | Modelo | Quadro / Corrente nominal | Quebrando Capacidade | Relação de preço | Características |
| Chint | NXM-400S/3300 250A | 400UM / 250UM | 36o | Sobre 60% of EZD | Alternativa doméstica, desempenho de alto custo |
| ABB | Tmax T4N250 | 400UM / 250UM | 50o | Sobre 120% of EZD | Strong breaking capacity, stable performance |
| Siemens | 3VT400N250 | 400UM / 250UM | 36o | Sobre 110% of EZD | Compatible with Siemens system, complete communication functions |
| Interruptor Changshu | CM3-400M/3300 250A | 400UM / 250UM | 36o | Sobre 70% of EZD | High-quality domestic brand, good compatibility |
- Pontos-chave da seleção & Soluções Alternativas
5.1 Core Selection Guidelines
Load Type Matching
Distribution Protection: EZD400E series (thermal-magnetic), adequado para iluminação, socket and non-motor loads
Proteção do Motor: Recommend EZD400M series (motor protection type with higher short-circuit trip multiple)
Proteção de Corrente Residual: Adopt VigiEZD400E series with integrated residual current protection
Breaking Capacity Selection
36o (Class E): Industrial geral & civil buildings with low short-circuit current
50o (Class M): Ambientes industriais com alta corrente de curto-circuito, such as near inverters and large motors
Calculation Rule: Select proper breaking capacity based on system short-circuit current calculation
Mounting Type Decision
Tipo Fixo: Baixo custo, for circuits without frequent replacement
Tipo de plug-in: Fácil manutenção, for important circuits requiring quick replacement (data center, hospital)
5.2 Recommended Alternative Solutions
| Cenário | Recommended Solution | Vantagens |
| Budget Limited, General Distribution | Chint NXM-400S/3300 250A | Preço baixo, meets basic performance requirements |
| High Breaking Capacity Required (50o) | Schneider CVS400N3250 | Same-brand upgrade, installation dimension compatible, maior capacidade de interrupção |
| Proteção precisa & Communication Needed | Schneider NSX400N3250 + Micrológico 2.3 | Electronic trip with adjustable parameters, support Modbus communication |
| Residual Current Protection Needed | VigiEZD400E3250K | Proteção integrada contra corrente residual, save space without extra module |
| Remote Control Needed | EZD400E3250K + Viagem de manobra + Contato 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℃; desclassificar por 0.5% per 100m altitude over 1000m.
- Especificação de fiação: Follow top-in bottom-out rule; fasten terminals to avoid overheating. 3P for three-phase three-wire; select 4P if neutral protection is needed.
- Accessory Installation: Auxiliary/alarm contacts, shunt/undervoltage releases can be field-installed; cut off power before installation for safety.
- Ciclo de Manutenção: Inspecione cada 6 months including appearance, mechanism flexibility and terminal tightness.
- Tratamento de falhas: Depois de tropeçar, 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 frame sizes (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.
- Regra de nomenclatura de modelo (Essencial)
| Segmento de modelo | Significado | Optional Value | Descrição |
| EZD | Série de produtos | EZD | EasyPact EZD molded case circuit breaker series |
| 100/160/250/400/630 | Quadro atual | 100/160/250/400/630 | Maximum rated current capacity |
| E/N/M | Quebrando Capacidade | E(25o), N(36o), M(50o) | Ultimate breaking capacity @400V AC |
| 3-4 | Número do pólo | 3(3P), 4(4P) | 3P=3-phase 3-wire; 4P=3-phase 4-wire |
| 0XX/XX0 | Corrente nominal | 15~630A | Rated current of thermal-magnetic trip unit |
| N/PK | Tipo de montagem | N(Fixo), PK(Plug-in) | Fixed as standard; PK for plug-in |
| MA | Tipo de aplicativo | MA(Proteção do Motor) | 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 (Máx.. 100UM)
2.2 EZD160 Frame (Máx.. 160UM)
2.3 EZD250 Frame (Máx.. 250UM)
2.4 EZD400 Frame (Máx.. 400UM)
2.5 EZD630 Frame (Máx.. 630UM, with Electronic Trip)
- Residual Current Protected Type (VigiEZD Series)
- Key Selection Instructions
- Common Model Quick Reference (Distribution Protection)
- Accessory Compatibility Guide
