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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.
Overview and applications
CQB2-40 Miniature Circuit Breaker
1.Compact structure and robust design
2.Low power consumption
3.Easy DIN-Rail extraction
4.Overload & short circuit protection
Suitable for industrial, commercial, high-rise and civil residences circuit protection.
CQB2-63 Miniature Circuit Breaker
1.High Interruption rating capabilities.
2.Overload & short circuit protection
3.Positive isolation
Suitable for industrial, commercial, high-rise and civil residences circuit protection.
CQB2-125 Miniature Circuit Breaker
1.Overload & short circuit protection
2.Positive isolation
3.High breaking capacity up to 10KA
4.Comprehensive range of accessories suitable for subsequent installation
Suitable for industrial, commercial, high-rise and civil residences circuit protection.
Technical data
CQB2-40 Miniature Circuit Breaker
| Specifications | |
| Rated voltage(V) | 230V~(1P+N ) |
| Rated current(A) | 10、16、20、25、32、40 |
| Number of poles | 1P+N |
| Rated short circuit breaking capacity Icn(A) | 4500A |
| Mechanical & Electrical life | Mechanical≥10000,Electrical≥10000 |
| Tripping curves | B、C、D |
| Tightening torque (N·m) | 1.5 |
| Pollution degree | 2 |
| Protection degree | IP20 |
| Overvoltage category | Ⅱ |
| Tripping characteristics | Table1 |
| Standards | IEC60898-1、GB/T10963.1 |
| Compliant certification | CCC |
CQB2-63 Miniature Circuit Breaker
| Specifications | |
| Rated insulation voltage | 500V |
| Rated impulse withstand voltage Uimp | 4000V |
| Rated current(A) | 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=lcs(A) | 6000A |
| Mechanical & Electrical life | Mechanical≥10000, Electrical≥ 6000 |
| Tripping characteristics | B、C、D |
| Grid distance | 45mm |
| Protection degree | IP20 |
| Standards | IEC60898-1、GB/T10963.1 |
| Compliant certification | CCC |
CQB2-125 Miniature Circuit Breaker
| Specifications | |
| 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 lcu(A) | 10000A |
| Reated service Short-circuit breaking capacity lcs(A) | 7500A |
| Rated impulse withstand voltage Uimp(V) | 4000V |
| Mechanical & Electrical life | Mechanical ≥8500, Electrical ≥1500 |
| Tripping curves | C、D |
| Tripping characteristics | table 1 |
| Protection degree | IP20 |
| Standards | IEC60947-2、GB/T14048.2 |
| Compliant certification | CCC |
Table 1 Tripping characteristics (Reference temperature 30°C)
CQB2-40/63 Miniature Circuit Breaker
| 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 Miniature Circuit Breaker
| 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.
Tripping curves
CQB2-40 Miniature Circuit Breaker
CQB2-63 Miniature Circuit Breaker
CQB2-125 Miniature Circuit Breaker
Conductor requirements and cross section
CQB2-40 Miniature Circuit Breaker
| 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 Miniature Circuit Breaker
| 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 Miniature Circuit Breaker
| Copper cross-section(mm²) | Rated current In(A) |
| 16 | 63A |
| 25 | 80A |
| 35 | 100A |
| 50 | 125A |
Dimensions(unit:mm)
CQB2-40 Miniature Circuit Breaker
CQB2-63 Miniature Circuit Breaker
CQB2-125 Miniature Circuit Breaker
Order Specifications
1.When ordering circuit breakers, the following points should be specified:
A) Product models, such as CQB2-40,CQB2-63,CQB2-125;
B) Poles of circuit breakers, such as 1P、1P+N、2P、3P、3P+N、4P;
C) Types of instantaneous tripping, such as type B/C/D;
D) Rated current of circuit breakers, such as 16A,20A,25A,63A,80A,100A,125A;
E) Order quantity, such as100 pcs
2.Purchase order template
CQB2-63 2P C/16A 100pcs
