CQB2LE Series Electronic Leakage Circuit Breaker
CQB2LE-32/40/63/125 series residual current operated circuit breakers are mainly suitable for lines with AC 50Hz, rated working voltage 230V/400V, and rated current up to 32A/40A/63A/125A. When a person is electrocuted or the leakage current of the power grid exceeds the specified value, the residual current operated circuit breaker can quickly cut off the power supply in a very short time to protect the safety of people and electrical equipment. The product also has overload, short circuit, and can be equipped with undervoltage and overvoltage protection functions. Under normal circumstances, the product can also be used for infrequent connection, disconnection and conversion of lines.It is suitable for various places such as industry, commerce, high-rise and residential buildings.
Product Overview
The CQB2LE-32 series residual current operated circuit breaker is meticulously designed by CHAC Electric to meet the customization requirements of international clients in the low-voltage electrical sector. As a proficient contract manufacturer with extensive export expertise, we are dedicated to delivering high-quality and reliable products. These electronic leakage MCBs are perfect for AC 50Hz distribution systems with a rated voltage of 230V/400V and a rated current up to 32A. When a person gets an electric shock or the grid leakage current exceeds the specified value, the residual current operated circuit breaker can rapidly cut off the power supply within an extremely short time, protecting the safety of people and electrical equipment. The product also has overload and short-circuit protection functions, as well as optional under-voltage and over-voltage protection functions. In normal conditions, it can also be used as a device for infrequent connection, disconnection, and conversion of lines. Our CQB2LE-32 series stands out due to advanced technology and strict 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.
Overview and applications
Product Features
CQB2LE-40
■ Sensitive protection: 30mA earth leakage protection with 0.1s fastresponse
■ Dual safety: Overload and short-circuit protection in one deviice
■ Wide applicability: 6-40A multi-current options for various loads
■ Compact design: 1P+N configuration saves space
CQB2LE-63
■ Balanced performance: 63A rating with 6000A breaking capacity
■ Fast protection: ≤0.1s tripping time for quick fault isolation
■ Flexible application: 2P to 4P options for single/three-phase systems
■ Easy installation:Standard size for simple integration
CQB2LE-125
■ Industrial grade: 125A high rated current for main distribution
■ Strong breaking: 10kA breaking capacity handles severe faults
■ Flexible settings: 30-300mA adjustable sensitivity
■ Multiple poles: 1P+N to 4P options for three-phase systems
■ High reliability: Long mechanical life for frequent operation
Ordering Specification
CQB2LE-40
Please specify the following when ordering:
1.Product Model: CQB2LE-40
2.Number of Poles: 1P+N
3.Rated Current & Tripping Curve: [e.g.: C/16A]
- Tripping Curve:B, C, D
- Rated Current (In): 6A, 10A, 16A, 20A, 25A, 32A, 40A
4.Rated Residual Operating Current (IAn): 30mA
5.Quantity: [e.g.: 100 pcs]
Ordering Example:
CQB2LE-40 1P+N C/16A 30mA 100 pcs
CQB2LE-63
Please specify the following when ordering:
1.Product Model: CQB2LE-63
2.Number of Poles: 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.Rated Residual Operating Current (IAn): 30mA, 50mA,100mA,300mA
5.Quantity: [e.g.: 100 pcs]
Ordering Example:
CQB2LE-63 2P C/32A 30mA 100 pcs
CQB2LE-125
Please specify the following when ordering:
1.Product Model: CQB2LE-125
2.Number of Poles: 1P+N, 2P,3P, 3P+N, 4P
3.Rated Current & Tripping Curve: [e.g.: C/100A]
- Tripping Curve: C, D
- Rated Current (In): 63A, 80A, 100A, 125A
4.Rated Residual Operating Current (IAn): 30mA, 50mA,
75mA, 100mA,300mA
5.Quantity: [e.g.: 100 pcs]
Ordering Example:
CQB2LE-125 3P C/100A 100mA 100 pcs
Type designation
CQB2LE-40
CQB2LE-63
CQB2LE-125
Tripping curves
CQB2LE-40
CQB2LE-63
CQB2LE-125
Dimensions(mm)
CQB2LE-40
CQB2LE-63
| Poles | L |
| 1P+N | 53.4 |
| 2P | 71.2 |
| 3P | 102.4 |
| 3P+N | 115.8 |
| 4P | 133.6 |
CQB2LE-125
Technical Specifications
CQB2LE-40
| Parameter | Specification |
| Rated voltage | 230V~ |
| Rated current | 6A, 10A, 16A, 20A, 25A, 32A, 40A |
| Frequency | 50Hz/60Hz |
| Number of poles | 1P+N |
| Rated residual operating current (IΔn) | 30 mA |
| Rated residual non-operating current | 15 mA |
| Rated short-circuit breaking capacity (Icu) | 4500 A |
| Rated residual making and breaking capacity | 500 A |
| Tripping time | ≤ 0.1 s |
| Mechanical life | 10,000 operations |
| Electrical life | 10,000 operations |
| Tripping characteristics | B, C, D |
| Pollution degree | 2 |
| Degree of protection | IP20 |
| Standards | IEC 61009-1, GB/T 16917.1 |
| Certification | CCC |
CQB2LE-63
| Parameter | |
| Rated voltage | 230V~ (2P, 1P+N) / 400V~ (3P, 4P, 3P+N) |
| Rated current | 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A |
| Number of poles | 2P, 3P, 4P, 1P+N, 3P+N |
| Rated breaking capacity (Icn = Ics) | 6000 A |
| Rated residual operating current (IΔn) | 30, 50, 100, 300 mA |
| Rated residual non-operating current | 0.5 IΔn |
| Rated residual making and breaking capacity | 2000 A |
| Tripping time | ≤ 0.1 s |
| Mechanical life | 4000 operations |
| Electrical life | 4000 operations |
| Tripping curves | B, C, D |
| Degree of protection | IP20 |
| Overvoltage category | Ⅲ |
| Standards | IEC 61009-1, GB/T 16917.1 |
| Certification | CCC |
CQB2LE-125
| Parameter | |
| Rated voltage | 230V~ (1P+N/2P), 400V~ (3P/3P+N/4P) |
| Rated current | 63A, 80A, 100A, 125A |
| Number of poles | 1P+N, 2P, 3P, 3P+N, 4P |
| Rated breaking capacity Icu (A) | 10000 A, 6000 A (Lower type) |
| Rated sensitivity IΔn | 30 mA, 50 mA, 75 mA, 100 mA, 300 mA |
| Mechanical & Electrical life | Mechanical ≥ 8500, Electrical ≥ 1500 |
| Tripping curves | C, D |
| Tightening torque (N·m) | 3.5 |
| Pollution degree | 2 |
| Degree of protection | IP20 |
| Overvoltage category | Ⅲ |
| Standards | IEC 60947-2, GB/T 14048.2 |
| Certification | CCC |
Tripping characteristics (Reference temperature 30°C)
CQB2LE-40
| Item | Tripping Curve | Test current In(A) | Initial Status | Time limit for tripping or non-tripping | Expected result | Remarks |
| Delay | ≤40 | Cold | 1.13In | ≤1h | Non-tripping | |
| Delay | ≤40 | Following previous test | 1.45In | <1h | Tripping | Current smoothly rises to specified value in 5s |
| Delay | ≤32 | Cold | 2.55In | 1<t<60s | Tripping | |
| Delay | 40 | Cold | 2.55In | 1<t<120s | Tripping | |
| Instantaneous | Any value | Cold | 3、5、10In | ≤0.1s | Non-tripping | B、C、D |
| Instantaneous | Any value | Cold | 5、10、20In | <0.1s | Tripping | B、C、D |
CQB2LE-63
| Item | Tripping Curve | Test current In(A) | Initial Status | Time limit for tripping or non-tripping | Expected result | Remarks |
| Delay | ≤63 | Cold | 1.13In | ≤1h | Non-tripping | |
| Delay | ≤63 | Following previous test | 1.45In | <1h | Tripping | Current smoothly rises to specified value in 5s |
| Delay | ≤32 | Cold | 2.55In | 1<t<60s | Tripping | |
| Delay | >32 | Cold | 2.55In | 1<t<120s | Tripping | |
| Instantaneous | Any value | Cold | 3, 5, 10In | ≤0.1s | Non-tripping | B, C, D |
| Instantaneous | Any value | Cold | 5, 10, 20In | <0.1s | Tripping | B, C, D |
CQB2LE-125
| Item | Tripping Curve | Test current In(A) | Initial Status | Time limit for tripping or non-tripping | Expected result | Remarks |
| a | C, D | 1.05In | Cold | 1h(In≤63A) 2h(In>63A) |
Non-tripping | Current smoothly rises to specified value within 5s |
| b | C, D | 1.3In | Following item a test | 1h(In≤63A) 2h(In>63A) |
Tripping | |
| c | C, D | 2In | Cold | 1s<t<300s | Tripping | |
| d | C | 8In×80% | Cold | t ≤ 0.2s | Non-tripping | Switch on the power supply by closing the auxiliary switch |
| D | 12In×80% | |||||
| e | C | 8In×80% | Cold | t < 0.2s | Tripping | Switch on the power supply by closing the auxiliary switch |
| D | 12In×80% |
Note: The term “cold” means that the test is carried out at a reeference calibration temperature without load before the test.
Conductor requirements and cross section
CQB2LE-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≤40 |
CQB2LE-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 |
CQB2LE-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.
