CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer
The CQM6 Standard Molded Case Circuit Breaker delivers essential overload and short-circuit protection for electrical distribution and motor circuits, spanning currents from 10A to 1250A across frame sizes 125A to 1250A. Its compact, miniaturized design enables unified panel integration and space savings, supporting 3 or 4 poles with breaking capacities up to 75kA. Fully compliant with IEC/EN 60947-1/2/3/4 and GB/T 14048.1/2/3/4 standards, it features versatile accessories like shunt trips, undervoltage releases, and auxiliaries for tailored control and monitoring. Operation modes include motorized (P), turning handle (Z), or direct (W), with insulation voltage up to 800V and impulse withstand of 8kV. Ideal for industrial, commercial, and infrastructure applications, it incorporates tested electrical durability exceeding handbook specifications for sustained reliability.
Product Features
■ Core Protection: Provides essential protection against overloads and short-circuits for distribution systems and motor circuits.
■ Current Range: Comprehensive coverage from 10A up to 1250A.
■ Compact Design: Features a miniaturized and unified footprint for easy panel integration and space savings.
■ Accessory Flexibility: Supports a wide range of accessories (shurht trips, auxiliaries, etc.) for customized control and monitoring
Compliance
■ Meets international and regional standards including
IEC/EN 60947-1( General Rules) GB/T 14048.1
IEC/EN 60947-2(Circuit-Breakers) GB/T 14048.2
IEC/EN 60947-3(Switchgear) GB/T 14048.3
IEC/EN 60947-4( Contactors & Motor-Starters) GB/T 14048.4
Accessory List
1.Our company can provide three new products for customers to choose from,namely the right-sideauxilary switch,the left-side shunt trip device,and the left-side undervoltage release device.
2.For the spedfcations of 220,320,240,340,270 and 370,the auxilaryswitcch can provide two pairs ofswitches.Please specily this vhen placing an order.
3.For the 250 and 350 specifications,the shunt trip device and undervoltage release for models 400 andabove can only be installed on 3-pole circuit breakers.
Selection Guide
| Product code ① | Shell frame grade ② | Breaking capacity ③ | Operating method ④ | The number of poles ⑤ | ||||
| CQM6 | 125 | C | P | 4 | ||||
| Molded case circuit breaker | C | S | M | H | P: Motorized operation Z: Timing handle W: Direct operation |
2-pole 3-pole 4-pole |
||
| 125 | 125 | 15/18 | 25/18 | / | / | |||
| 160 | 160 | 25/18 | 35/25 | 50/35 | / | |||
| 250 | 250 | 25/18 | 35/25 | 50/35 | / | |||
| 630 | 630 | / | 35/25 | 50/35 | 70/50 | |||
| 800 | 800 | / | 35/25 | 50/35 | 70/50 | |||
| 1250 | 1250 | / | 35/25 | 50/35 | 70/50 | |||
| Decoupler method and internal accessories ⑥ | Rated current A ⑦ | Function ⑧ | Optional code for four-pole products ⑨ | Special code ⑩ | |
| 300 | 125A | 2 | A | I | |
| The first digit indicates the type of detent 2: Instantaneous detent only 3: Duplicate detent Note: The last two digits are the accessory designator (see accessory table). |
125 | 10,16,20,32,40,50,63,80,100,125 | 1:For power distribution 2:For motor protection |
A:N-pole is unprotected and cannot be combined B:N-pole is unprotected and can be combined C:N-pole is protected and can be combined D:N-pole is protected and cannot be combined |
I: Overload alarm non-trip function |
| 160 | 10,16,20,32,40,50,63,80,100,125,140,160 | ||||
| 250 | 100,125,140,160,180,200,225,250 | ||||
| 630 | 250,315,350,400,500,630 | ||||
| 800 | 500,630,700,800 | ||||
| 1250 | 800,1000,1250 | ||||
| Accessory Voltage ⑪ | Motorized operating voltage ⑫ | Installation ⑬ | Whether to install a terminal block ⑭ | |||
| Q1 | D1 | Q | 2 | |||
| Undervoltage detent Q1:AC220V Q2:AC240V Q3:AC380V Q4:AC415V |
Shunt release F1:AC220V F2:AC380V F3:DC110V F4:DC24V |
Auxiliary alarm J1:AC125V J2:AC250V J3:DC125V J4:DC24V |
DC1 Electrical Operation D1:AC220V D2:AC230V D3:AC380V D4:AC400V |
DC3 Electrical Operation D5:AC230V D6:AC110V D7:DC220 D8:DC110 D9:AC110~240V D10:DC100~220V |
Q:Front of plate H:Rear of plate C:Inserted |
1:No installation 2:Installation |
| Note:When motorized operation is selected,please refer to the external accessories for the two voltages applicable for motorized operation. | ||||||
Main Technical Parameters
| Model number | CQM6-125 | CQM6-160 | ||||||
| Rated current of frame level Inm(A) | 125 | 160 | ||||||
| Number of poles | 2, 3, 4 | 3, 4 | ||||||
| Rated current In(A),at 40℃,50℃,55℃ | 10,16,20,25,32,40,50,63,80,100,125 | 10,16,20,25,32,40,50,63,80,100,125,140,160 | ||||||
| Rated operating voltage Ue(V),AC 50/60Hz | 400/415 | 400/415 | ||||||
| Rated insulation voltage Ui (V) | 800 | 800 | ||||||
| Rated impulse withstand voltage Uimp(KV) | 8 | 8 | ||||||
| Breaking capacity designation | C | S | C | S | M | |||
| Short-circuit breaking capacity Icu/Ics(kA) | AC400/415V | 46249 | 25/18 | 25/18 | 35/25 | 50/35 | ||
| Selectivity category | A | A | A | A | A | |||
| Number of operating cycles(cycle) | ON | 6000 | 6000 | |||||
| OFF | 10000 | 10000 | ||||||
| Trip mechanisms and protection types | Magnetic trip | Power distribution protection | ● | ● | ● | ● | ● | ● |
| Motor protection | ● | ● | ● | ● | ● | ● | ||
| Thermal-magnetic trip | Power distribution protection | ● | ● | ● | ● | ● | ● | |
| Motor protection | ● | ● | ● | ● | ● | ● | ||
| Accessory | Auxiliary contacts | ● | ● | ● | ● | ● | ● | |
| Alarm contacts | ● | ● | ● | ● | ● | ● | ||
| Shunt disconnect | ● | ● | ● | ● | ● | ● | ||
| Undervoltage detent | ● | ● | ● | ● | ● | ● | ||
| Manual operating mechanism | ● | ● | ● | ● | ● | ● | ||
| Motorized operating mechanism | ● | ● | ● | ● | ● | ● | ||
| Backplane wiring | ● | ● | ● | ● | ● | ● | ||
| Inserted | ● | ● | ● | ● | ● | ● | ||
| Coupling plate | ● | ● | ● | ● | ● | ● | ||
| Partition between phases | ● | ● | ● | ● | ● | ● | ||
| Derivative products | Dedicated for prepayment electric meters | ● | ● | ● | ● | ● | ● | |
| Overload alarm without trip | – | – | – | ● | ● | ● | ||
| Overall dimensions (mm) (a-b-c-ca) |
 |
3 P | 75-130-68-92 | 90-155-70-94 | 90-155-84-109 | |||
| 4 P | 100-130-68-92 | 120-155-70-94 | 120-155-84-109 | |||||
Note:● for optional accessories;”-” for no optional accessories.
Main Technical Parameters
| Model number | CQM6-250 | CQM6-630 | ||||||
| Rated current of frame level Inm(A) | 250 | 630 | ||||||
| Number of poles | 2, 3, 4 | 3, 4 | ||||||
| Rated current In(A),at 40℃,50℃,55℃ | 125,140,160,180,200,225,250 | 250,315,350,400,500,630 | ||||||
| Rated operating voltage Ue(V),AC 50/60Hz | 400/415 | 400/415 | ||||||
| Rated insulation voltage Ui (V) | 800 | 800 | ||||||
| Rated impulse withstand voltage Uimp(KV) | 8 | 8 | ||||||
| Breaking capacity designation | C | S | M | S | M | H | ||
| Short-circuit breaking capacity Icu/Ics(kA) | AC400/415V | 25/18 | 35/25 | 50/35 | 35/25 | 50/35 | 70/50 | |
| Selectivity category | A | A | A | A | A | A | ||
| Number of operating cycles(cycle) | ON | 6000 | 3000 | |||||
| OFF | 10000 | 8000 | ||||||
| Trip mechanisms and protection types |
Magnetic trip | Power distribution protection | ● | ● | ● | ● | ● | ● |
| Motor protection | ● | ● | ● | ● | ● | ● | ||
| Thermal-magnetic trip | Power distribution protection | ● | ● | ● | ● | ● | ● | |
| Motor protection | ● | ● | ● | ● | ● | ● | ||
| Accessory | Auxiliary contacts | ● | ● | ● | ● | ● | ● | |
| Alarm contacts | ● | ● | ● | ● | ● | ● | ||
| Shunt disconnect | ● | ● | ● | ● | ● | ● | ||
| Undervoltage detent | ● | ● | ● | ● | ● | ● | ||
| Manual operating mechanism | ● | ● | ● | ● | ● | ● | ||
| Motorized operating mechanism | ● | ● | ● | ● | ● | ● | ||
| Backplane wiring | ● | ● | ● | ● | ● | ● | ||
| Inserted | ● | ● | ● | ● | ● | ● | ||
| Coupling plate | ● | ● | ● | ● | ● | ● | ||
| Partition between phases | ● | ● | ● | ● | ● | ● | ||
| Derivative products | Dedicated for prepayment electric meters | ● | ● | ● | ● | ● | ● | |
| Overload alarm without trip | ● | ● | ● | ● | ● | ● | ||
| Overall dimensions (mm) (a-b-c-ca) |
 |
3 P | 105-165-70-96 | 105-165-93-120 | 140-257-105-155 | |||
| 4 P | 140-165-70-96 | 140-165-93-120 | 185-257-105-155 | |||||
Note:● for optional accessories;”-” for no optional accessories.
Main Technical Parameters
| Model number | CQM6-800 | CQM6-1250 | ||||||
| Rated current of frame level Inm(A) | 800 | 1250 | ||||||
| Number of poles | 3, 4 | 3, 4 | ||||||
| Rated current In(A),at 40℃,50℃,55℃ | 500, 630, 700, 800 | 1000, 1250 | ||||||
| Rated operating voltage Ue(V),AC 50/60Hz | 400/415 | 400/415 | ||||||
| Rated insulation voltage Ui (V) | 800 | 800 | ||||||
| Rated impulse withstand voltage Uimp(KV) | 8 | 8 | ||||||
| Breaking capacity designation | S | M | H | S | M | H | ||
| Short-circuit breaking capacity Icu/Ics(kA) | AC400/415V | 35/25 | 50/35 | 70/50 | 35/25 | 50/35 | 70/50 | |
| Selectivity category | A | A | A | A | A | A | ||
| Number of operating cycles(cycle) | ON | 3000 | 1000 | |||||
| OFF | 8000 | 3000 | ||||||
| Trip mechanisms and protection types | Magnetic trip | Power distribution protection | ● | ● | ● | ● | ● | ● |
| Motor protection | ● | ● | ● | ● | ● | ● | ||
| Thermal-magnetic trip | Power distribution protection | ● | ● | ● | ● | ● | ● | |
| Motor protection | ● | ● | ● | ● | ● | ● | ||
| Accessory | Auxiliary contacts | ● | ● | ● | ● | ● | ● | |
| Alarm contacts | ● | ● | ● | ● | ● | ● | ||
| Shunt disconnect | ● | ● | ● | ● | ● | ● | ||
| Undervoltage detent | ● | ● | ● | ● | ● | ● | ||
| Manual operating mechanism | ● | ● | ● | ● | ● | ● | ||
| Motorized operating mechanism | ● | ● | ● | ● | ● | ● | ||
| Backplane wiring | ● | ● | ● | ● | ● | ● | ||
| Inserted | ● | ● | ● | ● | ● | ● | ||
| Coupling plate | ● | ● | ● | ● | ● | ● | ||
| Partition between phases | ● | ● | ● | ● | ● | ● | ||
| Derivative products | Dedicated for prepayment electric meters | ● | ● | ● | ● | ● | ● | |
| Overload alarm without trip | ● | ● | ● | ● | ● | ● | ||
| Overall dimensions (mm) (a-b-c-ca) |
 |
3 P | 210-275-105-155 | 210-275-105-155 | ||||
| 4 P | 280-275-105-155 | 280-275-105-155 | ||||||
Note:● for optional accessories;”-” for no optional accessories.
Operating Characteristics
1.The inverse time operating characteristics of power distribution circuit when all poles areenergized simultaneously at anambient air temperature of +40℃(with no humidity compensation)are shown in the following table:
| Test current designation | Setting current multiple | Conventional time | Initial state |
| In≤63 63<In | |||
| Conventional non-tripping current | 1.05 | ≥1h ≥2h | Cool state |
| Conventional tripping current | 1.3 | <1h <2h | Hot state |
2.The inverse time action characteristics of circuit breakers for motor ption without humiditycompensation when all poles areenergized simultaneously at an ambient air temperature of+40C are showrin the following table.
| Test current designation | Setting current multiple | Conventional time | Initial state |
| In≤800 | |||
| Conventional non-tripping current | 1 | ≥2h | Cool state |
| Conventional tripping current | 1.2 | <2h | Hot state |
3.Action characteristics under short-circuit condition:The short-circuuit curent setting value ofthe instantaneous tripper of the circuitbreaker forpower distribution is 10ln.
The short-circuit current setting value of the instantaneous tripper of the circuit breaker for motorprotection is 12ln.
The accuracy of the short-circuit curent setting value of the instantaaneous tripper is 20% of the short-circuit currentsetting value.
CQM6-125 Operating Characteristic Curve
CQM6-160 Operating Characteristic Curve
CQM6-250 Operating Characteristic Curve
CQM6-630 Operating Characteristic Curve
CQM6-800 Operating Characteristic Curve
CQM6-1250 Operating Characteristic Curve
Outline and Installation Dimensions(mm)
Outline and Installation Dimensions(mm)
| Molded case circuit breaker | Overall dimension | Installation dimensions | Bolt | |||||||||||||||||||||
| A | A1 | A2 | A3 | B | B1 | B2 | B3 | B5 | B6 | H | H1 | H2 | H3 | H4 | H5 | H6 | A4 | B4 | ||||||
| 3P | 4P | 3P | 4P | 3P | 4P | 3P | 4P | |||||||||||||||||
| CQM6-125CS | 75 | 100 | 50 | 75 | – | – | – | – | 130 | 114 | 85 | 50 | 50 | – | 92 | 72 | 4 | 68 | 61 | 41 | 24 | 25 | 111 | M8/M6 |
| CQM6-160CS | 90 | 120 | 60 | 90 | – | – | – | – | 155 | 134 | 103 | 50 | 50 | – | 94 | 72 | 4 | 70 | 61 | 41 | 24 | 30 | 132 | M8 |
| CQM6-160M | 90 | 120 | 60 | 90 | – | – | – | – | 155 | 134 | 103 | 50 | 50 | – | 109 | 83 | 4 | 83 | 76 | 24.5 | 24.5 | 30 | 132 | M8 |
| CQM6-250CS | 105 | 140 | 70 | 105 | – | – | – | – | 165 | 144 | 103 | 50 | 100 | – | 96 | 72 | 4 | 70 | 61 | 46 | 24 | 35 | 126 | M8 |
| CQM6-250M | 105 | 140 | 70 | 105 | – | – | – | – | 165 | 144 | 102 | 50 | 110 | – | 120 | 95 | 4 | 91 | 84 | 22.5 | 24 | 35 | 126 | M8 |
| CQM6-630SMH | 140 | 185 | 88 | 132 | 140 | 196 | 112 | 168 | 257 | 230 | 179 | 90 | 110 | 42 | 155 | 107 | 5 | 105 | 97 | 64 | 35 | 44 | 194 | M10 |
| CQM6-800SMH | 210 | 280 | 140 | 210 | 180 | 250 | 140 | 210 | 275 | 243 | 192 | 90 | 110 | 87 | 155 | 107 | 5 | 104 | 97 | 65 | 24 | 70 | 242.5 | M12 |
| CQM6-1250SMH | 210 | 280 | 140 | 210 | 180 | 250 | 140 | 210 | 275 | 243 | 192 | 90 | 110 | 87 | 155 | 107 | 5 | 104 | 97 | 65 | 24 | 70 | 242.5 | M10*2 |
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?
Flexible customization services are available for enclosure dimensions, component configuration,
branding and project requirements.
Enclosure
Design
Customized enclosure sizes, structures and installation details.
Internal
Configuration
Flexible internal layout and component arrangement options.
Branding &
Logo
Private label logos, nameplates and brand identification.
Packaging
Design
Custom cartons, labels, manuals and packaging solutions.
Electrical
Configuration
Tailored electrical setup based on application requirements.
Certification
Support
Support for target-market standards and compliance requirements.
Download
CQM6 Series Moulded Case 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.
