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