CQB2-63 Series Miniature Circuit Breakers for Power Systems
Product Overview
These MCBs are suitable for AC 50Hz (or 60Hz) power distribution systems, featuring a rated voltage of 230/400V and a rated current up to 40A/63A/125A and below, with a rated short – circuit breaking capacity of up to 4500A/6000A/10000A. They serve as protection devices in distribution circuits for infrequent connection, disconnection, and switching operations. Equipped with overload, short – circuit, and isolation protection functions, they can be widely applied in various terminal distribution scenarios in the construction, power, and infrastructure industries.
What sets our CQB2-40/63/125 series apart is the blend of advanced technology and rigorous quality control. We utilize cutting – edge production equipment and adhere to strict quality inspection standards to ensure each unit meets the highest performance levels. Our commitment to innovation and precision ensures that these circuit breakers operate efficiently and reliably, even under demanding electrical conditions. This makes them an ideal choice for customers seeking robust and durable electrical protection solutions in diverse distribution applications.
Moreover, as a professional customization service provider, we understand the unique needs of our international clients. We offer flexible customization options, from product design and specifications to packaging and branding, enabling our clients to tailor the products to their specific market requirements. Our efficient production processes and stringent quality management systems guarantee timely delivery of premium – quality products, helping our clients stay ahead in the competitive global market.
Product Features
CQB2-40
■ Compact structure and robust design
■ Low power consumption
■ Easy DIN-Rail extraction
■ Overload & short circuit protection
■ Suitable for industrial, commercial, high-rise and civil residences circuit protection.
CQB2-63
■ High Interruption rating capabilities.
■ Overload & short circuit protection
■ Positive isolation
■ Suitable for industrial, commercial, high-rise and civil residences circuit protection.
CQB2-125
■ Overload & short circuit protection
■ Positive isolation
■ High breaking capacity up to 10KA
■ Comprehensive range of accessories suitable for subsequent installation
■ Suitable for industrial, commercial, high-rise and civil residences circuit protection.
Ordering Specification
CQB2-40
Please specify the following when ordering:
1.Product Model: CQB2-40
2.Number of Poles: 1P+N
3.Rated Current & Tripping Curve: [e.g.: C/32A]
- Tripping Curve (Type): B, C, D
- Rated Current (In): 10A, 16A, 20A, 25A, 32A, 40A
4.Quantity: [e.g.: 200 pcs]
Ordering Example:
CQB2-40 1P+N C/32A 200 pcs
CQB2-63
Please specify the following when ordering:
1.Product Model: CQB2-63
2.Number of Poles: 1P, 1P+N, 2P,3P, 3P+N, 4P
3.Rated Current & Tripping Curve: [e.g.: C/16A]
- Tripping Curve (Type): B, C, D
- Rated Current (In): 6A, 10A, 16A, 20A, 25A, 32A,40A,50A,63A
4.Quantity: [e.g.: 100 pcs]
Ordering Example:
CQB2-63 2P C/16A 100 pcs
CQB2-125
Please specify the following when ordering:
1.Product Model: CQB2-125
2.Number of Poles: 1P, 2P, 4P
3.Tripping Curve Type: C or D
4.Rated Current (In): 63A, 80A, 100A, 125A
5.Quantity: [e.g.: 100 pcs]
Ordering Example:
CQB2-125 2P C/100A 100 pcs
Type designation
CQB2-40
CQB2-63
CQB2-125
Tripping curves
CQB2-40
CQB2-63
CQB2-125
Dimensions(unit:mm)
CQB2-40
CQB2-63
CQB2-125
Technical Specifications
CQB2-40
| Parameter | |
| Rated voltage | 230V~ (1P+N) |
| Rated current | 10A, 16A, 20A, 25A, 32A, 40A |
| Number of poles | 1P+N |
| Rated short circuit breaking capacity (Icn) | 4500 A |
| Mechanical life | ≥ 10,000 operations |
| Electrical life | ≥ 10,000 operations |
| Tripping curves | B, C, D |
| Tightening torque | 1.5 N·m |
| Pollution degree | 2 |
| Degree of protection | IP20 |
| Overvoltage category | Ⅱ |
| Standards | IEC 60898-1, GB/T 10963.1 |
| Certification | CCC |
CQB2-63
| Parameter | |
| Rated insulation voltage | 500 V |
| Rated impulse withstand voltage (Uimp) | 4000 V |
| Rated current | 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A |
| Rated frequency | 50 Hz / 60 Hz |
| Number of poles | 1P, 1P+N, 2P, 3P, 3P+N, 4P |
| Rated breaking capacity (Icn = Ics) | 6000 A |
| Mechanical life | ≥ 10,000 operations |
| Electrical life | ≥ 6,000 operations |
| Tripping characteristics | B, C, D |
| Terminal center distance | 45 mm |
| Degree of protection | IP20 |
| Standards | IEC 60898-1, GB/T 10963.1 |
| Certification | CCC |
CQB2-125
| Parameter | |
| Rated voltage (V) | AC230V, AC400V |
| Rated current (A) | 63A, 80A, 100A, 125A |
| Number of poles | 1P, 2P, 3P, 4P |
| Tripping curves | 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 |
| Mechanical life | ≥ 8500 operations |
| Electrical life | ≥ 1500 operations |
| Degree of protection | IP20 |
| Standards | IEC 60947-2, GB/T 14048.2 |
| Certification | CCC |
Table 1 Tripping characteristics (Reference temperature 30°C)
CQB2-40/63
| Item | Tripping Curve | Test current In(A) | Initial Status | Time limit for tripping or non-tripping | Expected result | Remarks |
| a | B、C、D | 1.13ln | Cold | t≤1h | Non-tripping | Current smoothly rises to specified value within 5s |
| b | B、C、D | 1.45ln | Following item a test | t<1h | Tripping | |
| c | B、C、D | 2.55ln | Cold | 1s<t<60s(ln≤32A) 1s<t<120s(ln>32A) |
Tripping | |
| d | B | 3In | Cold | t≤0.1s | Non-tripping | Switch on the power supply by closing the auxiliary switch |
| C | 5In | |||||
| D | 10ln | |||||
| e | B | 5In | Cold | t<0.1s | Tripping | Switch on the power supply by closing the auxiliary switch |
| C | 10ln | |||||
| D | 20ln |
Note: The term “cold” means that the test is carried out at a reference calibration temperature without load before the test.
CQB2-125
| Item | Tripping Curve | Test current ln(A) | Initial Status | Time limit for tripping or non-tripping | Expected result | Remarks |
| a | C、D | 1.05ln | Cold | 1h(In≤63A) | Non-tripping | Current smoothly rises to specified value within 5s |
| b | C、D | 1.3ln | Following item a test | 2h(ln>63A) | Tripping | |
| c | C、D | 2ln | Cold | 1h(ln≤63A) | Tripping | |
| d | C | 8ln×80% | Cold | 2h(In>63A) | Non-tripping | Switch on the power supply by closing the auxiliary switch |
| D | 12ln×80% | 1s<t<300s | ||||
| e | C | 8In×120% | Cold | t≤0.2s | Tripping | Switch on the power supply by closing the auxiliary switch |
| D | 12ln×120% | t<0.2s |
Note: The term “cold” means that the test is carried out at a reference calibration temperature without load before the test.
Conductor requirements and cross section
CQB2-40
| Copper cross-section(mm²) | Rated current In(A) |
| 1 | In≤6 |
| 1.5 | 6 In≤13 |
| 2.5 | 13 In≤20 |
| 4 | 20 In≤25 |
| 6 | 25 In≤32 |
| 10 | 32 In≤50 |
CQB2-63
| Copper cross-section(mm²) | Rated current In(A) |
| 1 | In≤6 |
| 1.5 | 6 In≤13 |
| 2.5 | 13 In≤20 |
| 4 | 20 In≤25 |
| 6 | 25 In≤32 |
| 10 | 32 In≤50 |
| 16 | 50 In≤63 |
CQB2-125
| Copper cross-section(mm²) | Rated current In(A) |
| 16 | 63A |
| 25 | 80A |
| 35 | 100A |
| 50 | 125A |
Why Choose CHAC
With 30+ years of manufacturing experience, 1100+ employees, 100M+ poles
annual capacity and 90% automated production, CHAC provides stable production capacity and strict
quality control for global OEM/ODM customers. Our in-house manufacturing system supports long-term
cooperation for electrical brands, importers and distributors.
30+
YEARS EXPERIENCE
Specialized in low-voltage electrical manufacturing
1100+
EMPLOYEES
Professional team ensures stable quality and delivery
100M+
POLES ANNUAL CAPACITY
Large-scale production capacity to meet global demand
90%
AUTOMATED PRODUCTION
Advanced automation for high efficiency and consistency
Automated Assembly Line
Testing Laboratory
Injection & Stamping
Quality Inspection
Strict quality control system ensures every product meets global standards.
What Can We Customize?
We support customization across branding, packaging, product appearance,
electrical specifications, certification requirements and engineering development. Whether customers
need private label products, market-specific parameters or new product development, CHAC can provide
flexible solutions based on project requirements.
Logo & Branding
Custom logo printing, laser marking and nameplate solutions.
Packaging
Customization
Customized color boxes, cartons, labels and manuals.
Electrical
Customization
Current, voltage, breaking capacity, trip curve and other
special functions.
Product
Appearance
Housing color, handle color and appearance customization.
Certification
Support
Products comply with international standards and market
requirements.
Engineering
Development
Drawing evaluation, prototype testing and mass production.
Download
CQB2 Series Miniature Circuit Breaker
Complete product overview for low-voltage electrical components and product selection reference.
Need Technical Documents?
Contact us for datasheets, certificates, drawings, selection guidance or OEM/ODM project support.
Frequently Asked Questions
Q1. Do you support product customization based on our design requirements?
A1:Absolutely. We specialize in OEM and ODM cooperation in the low-voltage electrical field and have provided customized services for many internationally renowned companies. We offer full-process support, including R&D design, parameter adjustments, and special material selection, ensuring the product fully meets your requirements.
Q2: What is your production capacity and Minimum Order Quantity (MOQ)?
A2: We operate a highly automated production base with an annual output of over 100 million poles for miniature circuit breakers. Our MOQ policy is flexible. We can provide competitive trial orders for small batches and dedicated production capacity guarantee plans.
Q3: What assurances are there for product quality and certifications?
A3: Our main products are certified with CCC, CE, CB, and more, and are sold in over 30 countries and regions worldwide. The company has established a dedicated Quality Operations Center that works with the business and production departments to implement full-process quality control, ensuring products meet international standards.
Q4: Do you have the capability for product R&D and turning concepts into reality?
A4: We have a complete R&D team and digital workshops, backed by extensive customization experience serving numerous international clients. From concept proposal and sample development to mass production, we provide end-to-end technical support to help bring your ideas to life.
