CQB3-63 Series 50Hz/60Hz AC Miniature Circuit Breaker
CQB3-63 series miniature circuit breakers are suitable for protection of distribution lines with AC 50Hz (or 60Hz), rated working voltage 230/400V, rated current up to 63A, and rated short-circuit breaking capacity not exceeding 6000A. They are used for infrequent connection, disconnection and conversion of lines, and have overload, short-circuit and isolation protection functions. They can be widely used in terminal distribution application scenarios in various industries such as construction, new energy, electricity, and infrastructure.
Product Overview
The CQB3-63 series miniature circuit breaker, crafted by CHAC Electric, is designed to fulfill the customization needs of international clients in low – voltage electrical systems. As a professional contract manufacturer with extensive export experience, we excel in ODM/OEM services.
These MCBs are ideal for AC 50Hz (or 60Hz) distribution systems with a rated voltage of 230/400V and a rated current up to 63A, featuring a rated short – circuit breaking capacity of up to 6000A. They serve as protective devices in distribution circuits for infrequent connection, disconnection, and switching. Equipped with overload, short – circuit, and isolation protection, they’re suitable for various terminal distribution scenarios in construction, new energy, power, and infrastructure industries.
Our CQB3-63 series highlights advanced technology and strict quality control. Leveraging cutting – edge equipment and stringent quality standards, we guarantee reliable performance. We understand international clients’ unique requirements and offer flexible customization from product design to packaging. Our efficient processes and quality systems ensure timely delivery of high – quality products, empowering clients to thrive in the global market.
Product Features
■ High Breaking Capacity
6kA short-circuit protection rating ensures reliable circuit interruption under fault conditions
■ Wide Current Range
6-63A ratings with B/C/D tripping characteristics for residential and commercial applications
■ Long Service Life
≥10,000 mechanical operations and ≥6,000 electrical operations
Ordering Specification
1.Product Model: CQB3-63
2.Number of Poles: 1P, 1P+N, 2P, 3P, 3P+N,4P
3.Rated Current & Tripping Curve: [e.g.: C/32A]
- Tripping Curve:B,C,D
- Rated Current (In): 6A, 10A, 16A, 20A, 25A, 32A,40A,50A,63A
4.Quantity: [e.g.: 100 pcs]
Ordering Example:
CQB3-63 2P C/32A 100 pcs
Type designation
Tripping curves
Dimensions (unit:mm)
Technical Specifications
| Parameter | |
| Rated Insulation Voltage (Ui) | 500V |
| Rated Impulse Withstand Voltage (Uimp) | 4000V |
| Rated Current (In) | 6, 10, 16, 20, 25, 32, 40, 50, 63 |
| Rated Frequency | 50Hz / 60Hz |
| Number of Poles | 1P, 1P+N, 2P, 3P, 3P+N, 4P |
| Rated Breaking Capacity (Icn) | 6000A |
| Mechanical Life & Electrical Life | Mechanical ≥10000, Electrical ≥6000 |
| Tripping Curves | B, C, D |
| Mounting Rail | 45mm |
| Degree of Protection (IP Code) | IP20 |
| Applicable Standards | IEC60898-1, GB/T10963.1 |
| Certification | CCC |
Table1 Tripping characteristics (Reference temp.30°C)
| Item | Type | 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 in 5s |
| b | B、C、D | 1.45ln | Following previous test |
1h | Tripping | |
| c | B、C、D | 2.55ln | Cold | 1s<t<60s(In≤32A) 1s<t<120s(In>32A) |
Tripping | |
| d | B | 3ln | Cold | t≤0.1s | Non-tripping | Switch on the power supply by closing the auxiliary switch |
| C | 5In | |||||
| D | 10In | |||||
| 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.
Conductor requirements and cross section
| 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 |
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
CQB3 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.
