CQB2-40 Miniature Circuit Breaker
The CQB2-40 miniature circuit breaker provides overload and short-circuit protection within the published 10A–40A range. Its verified product data lists 4.5kA Icn, 1P+N and B / C / D. Final selection must match the conductor, load, prospective fault current, installation system and applicable local rules.
Product Overview
CQB2-40 is a 4.5kA Icn miniature circuit breaker covering 10A–40A. It is available with 1P+N and B / C / D trip options as stated in the product data.
The model data references IEC 60898-1; GB/T 10963.1 and lists CCC certification. Standards, certification scope and technical documents must be confirmed for the ordered configuration and destination market.
Key Features
Typical Applications
It is intended for AC distribution circuits where the selected current rating, curve, pole arrangement and breaking capacity match the conductor and system study. Typical project contexts include residential, commercial and light-industrial final distribution; suitability depends on the actual circuit rather than the application label alone.
Applications and Selection Guide
Use the product-specific values below as a shortlist, then validate the complete circuit design. Product ratings do not replace a fault-current study, conductor calculation, coordination review or applicable installation rules.
| Selection point | CQB2-40 option | What the project must confirm |
|---|---|---|
| Rated current | 10A–40A | Coordinate with design current, conductor ampacity, ambient temperature and grouping |
| Trip curve | B / C / D | Choose for load inrush and required fault-clearing performance, not by current alone |
| Breaking capacity | 4.5kA Icn | Confirm against the prospective short-circuit current at the installation point |
| Pole arrangement | 1P+N | Match supply system and local switching or isolation rules |
| Installation interface | DIN-rail installation | Check enclosure, rail/base, terminal and conductor compatibility |
Breaking Capacity
4.5kA Icn is the published product value. Confirm the prospective short-circuit current at the installation point.
Trip and Load Behaviour
B / C / D is the available trip/protection option. Match it to load inrush and required disconnection performance.
Pole Configuration
Available arrangement: 1P+N. Confirm which conductors must be switched and protected under local rules.
MCB or RCBO
An MCB does not replace residual-current protection where an RCD or RCBO is required.
Ordering Guide
- Specify the exact model: CQB2-40.
- State the required current rating within 10A–40A.
- Confirm pole arrangement: 1P+N.
- Confirm trip or protection option: B / C / D.
- Provide system voltage, expected fault level, destination market, quantity and any document requirements.
Installation and Coordination Checks
- Verify conductor material and cross-section against the circuit calculation and the published terminal range.
- Confirm the prospective short-circuit current does not exceed the applicable breaking rating.
- Check upstream/downstream coordination, enclosure temperature, grouping, altitude and required clearances.
- Installation, isolation, testing and maintenance must be carried out by qualified personnel under applicable rules.
Type designation
Tripping curves
Dimensions(unit:mm)
Technical Specifications
| 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 |
Table 1 Tripping characteristics (Reference temperature 30℃)
| 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.
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 |
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?
For CQB2-40 projects, CHAC can review private-label marking, packaging, appearance, available electrical configurations and technical-document requirements. Requests outside the published range are subject to engineering evaluation, testing, MOQ and project feasibility.
Logo & Branding
Private-label marking and nameplate options are subject to artwork review and sample approval.
Packaging
Customization
Cartons, labels and manuals can be prepared for the approved order specification and destination market.
Electrical
Customization
Select from the published 10A–40A, 1P+N and B / C / D options; non-standard requests require technical evaluation.
Product
Appearance
Appearance options can be reviewed subject to tooling, MOQ, marking requirements and technical feasibility.
Certification
Support
Datasheets, drawings and verified certificate information are supplied for the applicable approved configuration.
Engineering
Development
Project support may include drawing review, sample evaluation, testing and production planning, subject to technical approval.
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.
CQB2-40 Product FAQ
What is a 1P+N miniature circuit breaker?
A 1P+N device switches the phase and neutral together while the protected pole arrangement follows the product design. CQB2-40 is a compact 230V AC, 1P+N MCB for overload and short-circuit protection within its published 10A–40A range.
Is a 1P+N breaker the same as a 2P breaker?
Not necessarily. The switching and protection arrangements can differ even though both devices occupy two conductor positions. Confirm which poles are protected and switched, plus the neutral and isolation requirements of the project.
What does the CQB2-40 miniature circuit breaker protect?
It protects against overload and short circuit. It does not provide residual-current protection, so a separate RCD or a suitable RCBO must be evaluated when leakage protection is required.
How does the CQB2-40 MCB trip?
Its thermal element responds to sustained overcurrent and its magnetic mechanism responds to higher fault current. The available B, C and D curves have different instantaneous-trip behavior and must be matched to load inrush and fault conditions.
Why choose a compact 1P+N MCB?
A compact 1P+N arrangement can support linked phase-and-neutral switching in a single-phase distribution design. Selection still depends on system rules, enclosure space, 4.5kA Icn suitability and the exact circuit requirements.
Can the CQB2-40 be used in every market?
No product should be assumed acceptable in every market. CQB2-40 references IEC 60898-1 and GB/T 10963.1, with CCC listed; the buyer must confirm the required approval, documentation and local installation rules for the destination.
Confirm the Right CQB2-40 Configuration
Send your current rating, pole arrangement, trip option, system voltage, prospective fault level, destination market and quantity. CHAC will review the request against the published product range.
