Disjuntor em Caixa Moldada CQB2-125
O Disjuntor miniatura CQB2-125 é projetado para proteção contra sobrecarga e curto-circuito em circuitos de distribuição CA de maior corrente. Está disponível nas classificações 63A, 80A, 100A e 125A, com curvas de disparo C ou D e configurações 1P, 2P, 3P ou 4P. A série possui uma capacidade máxima de interrupção de curto-circuito de 10kA e é especificada conforme IEC 60947-2. Selecione a configuração de acordo com o projeto do circuito, a corrente de falha presumida, os requisitos dos condutores e o mercado de destino.
Visão Geral do Produto
O CQB2-125 é um disjuntor miniatura de corrente alternada de alta capacidade para circuitos de distribuição comerciais, leves industriais e de infraestrutura que exigem proteção contra sobrecarga e curto-circuito. Está disponível nas classificações 63A, 80A, 100A e 125A, com curvas de disparo C ou D e configurações 1P, 2P, 3P ou 4P. A série oferece classificações de curto-circuito 10kA Icu e 7.5kA Ics e foi projetada de acordo com as normas IEC 60947-2 e GB/T 14048.2.
A seleção deve basear-se na corrente de projeto, na capacidade do condutor, na disposição dos postes, no inrush de carga, na corrente de curto-circuito presumida e nos requisitos do mercado de destino. O CQB2-125 é um produto CA e não deve ser considerado como substituto de um disjuntor classificado para CC, de um RCBO com proteção contra corrente residual ou de um MCCB necessário para proteção ajustável e maiores capacidades de interrupção de falha.
Principais Características
Aplicações Típicas
O CQB2-125 pode ser avaliado para proteção de alimentadores e de ramais de maior corrente em quadros de distribuição comerciais, distribuição em edifícios altos, painéis leves industriais e equipamentos de infraestrutura. É adequado apenas quando a corrente selecionada, a curva, a configuração dos polos e as classificações de curto-circuito correspondem ao estudo do circuito. Para circuitos em 63A e abaixo, compare o CQB2-63; quando forem necessárias configurações ajustáveis ou uma classe de operação mais elevada, revise o Gamma de MCCB.
Guia de Candidaturas e Seleção
| Item de seleção | Como avaliar isso | CQB2-125 options |
|---|---|---|
| Corrente nominal | Confirm design current, conductor capacity, installation method, ambient temperature, grouping and coordination. Do not select 125A simply because it is the highest available rating. | 63A, 80A, 100A, 125A |
| Curva de deslocamento | Compare o consumo normal de corrente, o consumo inicial ou de entrada e o nível de corrente de falha necessário para o funcionamento magnético oportuno. | C or D |
| Número de polos | Match the supply system and determine which live conductors must be switched and protected together under the project rules. | 1P, 2P, 3P, 4P |
| Short-circuit duty | Verify that the prospective short-circuit current and protection coordination are within the device ratings at the installation point. | Icu 10kA; Ics 7.5kA |
| Standard and documents | Verifique o padrão do produto, as regras do mercado de destino e os documentos exatos exigidos pelo cliente ou pelo organismo de homologação. | IEC 60947-2; GB/T 14048.2; CCC confirmed |
Compare current range, breaking capacity, tripping curves, pole configurations and protection functions before selecting a CQB2-125 miniature circuit breaker.
MCB de 6kA vs. MCB de 10kA
Escolha a capacidade de ruptura de acordo com a corrente de curto-circuito prevista no ponto de instalação, e não apenas com a corrente nominal do circuito.
C Curve vs D Curve
Select the tripping curve according to the load’s inrush characteristics and the available fault current, not by current rating alone.
1P vs 2P vs 3P vs 4P
Choose the pole configuration from the supply arrangement and required common switching or isolation—not from panel space alone.
Disjuntor (MCB) vs Disjuntor Diferencial (RCBO)
Um MCB protege contra sobrecarga e curto-circuito, enquanto um RCBO também oferece proteção contra corrente residual.
Need Help Selecting a CQB2-125 Configuration?
Share the rated current, pole configuration, tripping curve, system voltage, available fault-current information and quantity. CHAC will review the requested configuration and applicable documents.
CQB2-125 Ordering Guide
| Required information | Buyer selection |
|---|---|
| Product series | CQB2-125 |
| Corrente nominal | 63A / 80A / 100A / 125A |
| Número de polos | 1P / 2P / 3P / 4P |
| Curva de deslocamento | C/D |
| Project details | System voltage, application and available fault-current information |
| Commercial details | Quantity, destination market, marking, packaging and required documents |
Installation Details to Confirm
How to Choose Between C and D Curves
C and D curves respond differently to short-duration inrush current. C curve is commonly evaluated for general distribution loads with moderate inrush, while D curve may be considered for equipment with higher starting current. These are selection tendencies, not universal assignments. Confirm that the chosen curve tolerates normal starting current while still providing the required fault protection and disconnection time.
How to Choose the Pole Configuration
Select 1P, 2P, 3P or 4P from the actual supply and isolation requirements. The design must identify which conductors require protection and common switching. Neutral treatment, earthing arrangement and local rules vary, so the pole configuration should be confirmed against the project drawings rather than selected from enclosure space alone.
When a 10kA MCB Is Required
The 10kA Icu value describes the rated ultimate short-circuit breaking capacity, not the normal load current. Use CQB2-125 only when the prospective short-circuit current, Ics requirement and protection coordination are within its published ratings. Where the required duty exceeds these values, select a suitably rated protective device or a verified coordinated solution.
CQB2-125 Type Designation
CQB2-125 C and D Tripping Curves
CQB2-125 Dimensions (mm)
Especificações Técnicas
Use the table below to confirm voltage, rated current, poles, tripping curve, short-circuit duty, service life, protection degree, standard and certification for the CQB2-125 series. Final selection must be checked against the complete circuit design.
| Parâmetro | CQB2-125 |
| Tensão nominal (V) | AC230V, AC400V |
| Corrente nominal (A) | 63A, 80A, 100A, 125A |
| Número de polos | 1P, 2P, 3P, 4P |
| Curvas de disparo | C, D |
| Rated short-circuit breaking capacity Icu (A) | 10000 A |
| Rated service short-circuit breaking capacity Ics (A) | 7500 A |
| Rated impulse withstand voltage Uimp (V) | 4000 V |
| Vida mecânica | ≥ 8500 operations |
| Vida elétrica | ≥ 1500 operations |
| Grau de proteção | IP20 |
| Normas | IEC 60947-2, GB/T 14048.2 |
| Certificação | CCC |
CQB2-125 Tripping Characteristics at 30°C Reference Temperature
| Artigo | Curva de disparo | Test current ln(A) | Estado Inicial | Prazo para tropeçar ou não tropeçar | Resultado esperado | Observações |
| a | C、D | 1.05ln | Frio | 1h (In≤63A) | Não disparável | A corrente aumenta suavemente até atingir o valor especificado em 5 segundos |
| b | C、D | 1.3ln | Seguindo o item a | 2h(ln>63A) | Viagem | |
| c | C、D | 2ln | Frio | 1h(ln≤63A) | Viagem | |
| d | C | 8ln×80% | Frio | 2h(In>63A) | Não disparável | Ligue a fonte de alimentação fechando o interruptor auxiliar |
| D | 12ln×80% | 1s<t<300s | ||||
| e | C | 8In×120% | Frio | t≤0.2s | Viagem | Ligue a fonte de alimentação fechando o interruptor auxiliar |
| D | 12ln×120% | t<0.2s |
Test note: “Cold” means the test is carried out at the reference calibration temperature without load before the test.
Reference Copper Conductor Cross-Sections
| Secção transversal de cobre (mm²) | Corrente nominal In(A) |
| 16 | 63A |
| 25 | 80A |
| 35 | 100A |
| 50 | 125A |
Conductor note: These cross-sections are CQB2-125 product references. Final conductor sizing must follow the project design, installation method, ambient temperature, grouping, voltage-drop requirements and applicable local rules.
Porquê escolher a CHAC
CQB2-125 production is supported by CHAC’s low-voltage manufacturing, assembly and quality-control system. Incoming components, assembly processes, operating checks and final inspection are managed against the approved product specification. The company-scale figures below describe CHAC’s overall manufacturing capability rather than a separate performance claim for this model.
30+
ANOS DE EXPERIÊNCIA
Low-voltage product engineering and manufacturing experience
1100+
FUNCIONÁRIOS
Production, engineering and quality teams support project execution
100M+
CAPACIDADE ANUAL DE POSTOS
Company-wide annual pole capacity across supported product ranges
90%
PRODUÇÃO AUTOMATIZADA
Automated processes support repeatable assembly and inspection
Linha de Montagem Automatizada
Laboratório de Ensaios
Injeção e Estampagem
Inspeção de Qualidade
Quality records and applicable product documents can be supplied for the confirmed CQB2-125 configuration. Certification and market-approval availability must be verified for the selected model.
O que podemos personalizar?
For CQB2-125 projects, CHAC can assess private-label marking, packaging, appearance, existing electrical configurations and technical-document requirements. Requests outside the published product range, including new electrical ratings or market approvals, are subject to engineering evaluation, testing and project feasibility.
Logótipo e Identidade Visual
Private-label marking and nameplate options are available subject to artwork review and sample approval.
Embalagem
Personalização
Color boxes, cartons, labels and manuals can be prepared for the destination market and approved order specification.
Elétrico
Personalização
Select from the published 63–125A, 1P–4P and C/D options; requests outside this range require technical evaluation.
Produto
Aparência
Housing, handle and appearance options can be reviewed subject to tooling, MOQ and technical feasibility.
Certificação
Apoio
Datasheets, desenhos e informações do certificado verificadas são fornecidas para a configuração aprovada aplicável.
Engenharia
Desenvolvimento
Project support can include drawing review, sample evaluation, testing and production planning, subject to technical approval.
Transferir
Disjuntor Miniature Série CQB2
Download the CQB2 series overview for product selection reference. Confirm that each specification and document applies to the CQB2-125 configuration requested for your project.
Need CQB2-125 Technical Documents?
Request the applicable datasheet, drawings, verified certificate information, selection support or OEM/ODM project review.
CQB2-125 Miniature Circuit Breaker FAQ
Q1. What does 10kA mean on the CQB2-125 miniature circuit breaker?
The CQB2-125 has a rated ultimate short-circuit breaking capacity (Icu) of 10,000A and a rated service short-circuit breaking capacity (Ics) of 7,500A. The 10kA marking does not make the breaker suitable for every installation. The prospective short-circuit current at the installation point and the complete protection design must be checked before selection.
Q2. How do I choose between a C curve and D curve MCB?
Choose the curve according to the load’s inrush characteristics and the required protection coordination. C curve is commonly evaluated for general distribution loads with moderate inrush, while D curve may be considered for loads with higher starting current. The correct choice depends on the actual load and system study, not on rated current alone.
Q3. What is the difference between Icu and Ics?
Icu is the rated ultimate short-circuit breaking capacity. Ics is the rated service short-circuit breaking capacity and indicates the short-circuit duty after which the breaker is expected to remain suitable for continued service under the applicable test conditions. For CQB2-125, the listed values are 10kA Icu and 7.5kA Ics.
Q4. Can the CQB2-125 be used as a 125A DC circuit breaker?
No. The specifications on this page describe an AC 230/400V product. AC and DC interruption duties are not interchangeable. Use a breaker that is specifically rated and verified for the intended DC system when DC protection is required.
Q5. What cable size is required for a 125 amp circuit breaker?
The CQB2-125 product reference table pairs 125A with a 50mm² copper conductor; it also lists 16mm² for 63A, 25mm² for 80A and 35mm² for 100A. These are product references, not universal wiring rules. Final conductor sizing must account for installation method, temperature, grouping, voltage drop, conductor material and local electrical requirements.
Q6. When should I choose a 125A MCB instead of a 63A MCB or MCCB?
Consider CQB2-125 when the circuit design requires a 63A to 125A modular AC breaker and its fixed C or D curve, 10kA Icu and other listed characteristics meet the project. For lower-current circuits, a 63A-range MCB may be more appropriate. If adjustable protection, higher fault duty or more advanced coordination is required, evaluate an MCCB. The final decision should be made from the complete system study.
Build the Right CQB2-125 Configuration for Your Project
Send the required current rating, C or D curve, pole configuration, system voltage, destination market and estimated quantity. CHAC will review the specification and provide the applicable technical documents and commercial proposal.
