CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer

The CQM6 MCCB provides overload and short-circuit protection within its published 16–1600A range. Specification should follow the system voltage, load, conductor coordination, prospective fault current and applicable rules—not the ampere value alone.

Poles:
2P / 3P / 4P, depending on frame; CQM6-1600: 3P
Rated Current:
16–1600A
Rated Voltage:
AC 400/415V; CQM6-1600 also lists 660/690V configurations
Trip / Protection:
overload and short-circuit protection
Breaking Data:
C/S/M/H/L classes, with Icu up to 100kA for the listed CQM6-1600 660/690V configurations; verify the exact frame and voltage
Standard:
IEC/EN 60947-1/-2/-3/-4 and GB/T 14048 references listed on the page

Product Overview

CQM6 is a mccb breaker for AC distribution and protection applications. Its published range covers 16–1600A with 2P / 3P / 4P, depending on frame; CQM6-1600: 3P options. Selection depends on the complete power-system design, including fault level, coordination, conductor ampacity, enclosure conditions and local rules.

The supplied product specification references IEC/EN 60947-1, IEC/EN 60947-2, IEC/EN 60947-3 and IEC/EN 60947-4, together with GB/T 14048.1, .2, .3 and .4. These standard references do not, by themselves, establish certification for a particular order.

Key Features

  • Core Protection: Provides essential protection against overloads and short-circuits for distribution systems and motor circuits.
  • Current Range: Comprehensive coverage from 16A up to 1600A.
  • Compact Design: Features a miniaturized and unified footprint for easy panel integration and space savings.
  • Accessory Flexibility: Supports a wide range of accessories (shunt trips, auxiliaries, etc.) for customized control and monitoring.
  • Published current range: 16–1600A.
  • Pole availability depends on the frame: 2P/3P/4P for CQM6-125 and -250, 3P/4P for the other listed frames up to 1250, and 3P for CQM6-1600.

Typical Applications

Typical applications include commercial, industrial and infrastructure distribution or motor circuits. These are evaluation contexts rather than universal approvals. Confirm the exact frame, voltage, breaking duty, trip unit, accessories and installation method before specification.

Applications and Selection Guide

Use the verified CQM6 values below to create a shortlist, then validate the complete circuit. An MCCB rating does not replace conductor calculations, fault-current analysis, coordination review or local installation requirements.

Selection point CQM6 reference What the project must confirm
Rated current 16–1600A Design current, conductor ampacity, installation method, temperature and grouping
Voltage AC 400/415V; CQM6-1600 also lists 660/690V configurations Supply system and equipment rating
Poles 2P / 3P / 4P, depending on frame; CQM6-1600: 3P Live conductors and neutral treatment
Trip / protection thermal-magnetic trip Load profile, fault response and coordination
Breaking capacity C/S/M/H/L classes, with Icu up to 100kA for the listed CQM6-1600 660/690V configurations; verify the exact frame and voltage Prospective short-circuit current at the installation point

Fixed vs Adjustable Protection

A fixed thermal-magnetic device can suit a stable design, while an adjustable trip unit may help coordination when the project study requires field settings.

Trip Coordination
Compare MCCB Options →

MCCB vs MCB

An MCCB is normally evaluated for higher current, fault duty or accessory flexibility; an MCB may be more suitable for compact final circuits.

Current & Fault Duty
Compare MCCB and MCB →

Icu vs Ics

The saved data for CQM6 lists C/S/M/H/L classes, with Icu up to 100kA for the listed CQM6-1600 660/690V configurations; verify the exact frame and voltage. Match the declared duty to the prospective short-circuit current and continuity objective.

Short-Circuit Study
Review Technical Support →

Pole and Neutral Arrangement

Published pole options are 2P / 3P / 4P, depending on frame; CQM6-1600: 3P. Confirm which conductors must be switched, protected and isolated together.

System Arrangement
View MCCB Range →

Ordering Guide

  1. State the exact model: CQM6.
  2. Provide frame and rated current within the published range: 16–1600A.
  3. Confirm poles: 2P / 3P / 4P, depending on frame; CQM6-1600: 3P.
  4. Specify the trip unit or protection function: thermal-magnetic trip.
  5. Provide system voltage, frequency, application, expected fault level, destination market and quantity.
  6. List required accessories, terminals, documents and any approved OEM/ODM marking or packaging requirements.

Installation and Coordination Checks

  • Use the exact model drawing and instructions; do not infer terminal positions, supply direction or accessory compatibility from another MCCB.
  • Verify conductor material and cross-section against the circuit calculation, terminal data, temperature and grouping.
  • Confirm Icu/Ics or DC fault duty, upstream/downstream coordination, enclosure conditions, altitude and clearances.
  • Installation, isolation, testing and maintenance must be performed by qualified personnel under applicable rules.

Selection Guide

CHAC CQM6 MCCB - Selection Guide

Product code ① Extension Code ② Shell frame grade ③ Breaking capacity ④ Operating method ⑤ Number of poles ⑥
CQM6 G 125 C P 4
Molded case circuit breaker —:Thermal and magnetic protection are not adjustable
G:Overload alarm without trip function
C S L M H P:Motorized operation
Z:Turning handle
W.Direct operation
125A:2P,3P,4P
160A:3P,4P
250A:2P,3P,4P
400A:3P,4P
630A:3P,4P
800A:3P,4P
1250A:3P,4P
1600A:3P
125 125 15/8 25/18 / / /
160 160 25/18 35/25 / 50/35 /
250 250 25/18 35/25 / 50/35 /
400 400 / 35/25 / 50/35 70/50
630 630 / 35/25 / 50/35 70/50
800 800 / 35/25 / 50/35 70/50
1250 1250 / / / 50/35 70/55
1600 1600 / / 70/20 100/35 100/50
Trip Unit &Accessories ⑦ Rated current A ⑧ Function ⑨ 4P Option Code ⑩ Special code ⑪
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 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 16,20,32,40,50,63,80,100,125,140,160
250 100,125,140,160,180,200,225,250
400 250,315,350,400
630 250,315,350,400,500,630
800 500,630,700,800
1250 800,1000,1250
1600 800,1000,1250,1400,1500,1600
Accessory Voltage ⑫ Motorized operating voltage ⑬ Installation ⑭ Terminal Block Option ⑮
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 CD1 Electrical Operation
D1:AC220V
D2:AC230V
D3:AC380V
D4:AC400V
CD2 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:Noinstitution
2:Installation
Note:When motorized operation is selected,please refer to the external accessories for the two voltages applicable for motorized operation.

Accessory List

CHAC CQM6 MCCB - Accessory List
CHAC CQM6 MCCB - Accessory List

CHAC offers a right-side auxiliary switch, a left-side shunt release and a left-side undervoltage release.

For accessory codes 220, 320, 240, 340, 270 and 370, the auxiliary switch can provide two contact pairs. Specify this requirement when ordering.

For accessory codes 250 and 350, the shunt release and undervoltage release on frames 400 and above are available only for 3-pole circuit breakers.

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°C,50°C,55°C 16,20,25,32,40,50,63,80,100,125 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 15/8 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) CHAC CQM6 MCCB outline dimension reference a b c and ca 3 P 75×130×68×91 90×155×70×95 90×155×85 ×109
4 P 100×130×68×91 120×155×70×95 120×155×85 ×109

Note: ● indicates an available optional accessory; – indicates that the accessory is not available.

Main Technical Parameters

Model number CQM6-250 CQM6-400 CQM6-630
Rated current of frame level Inm(A) 250 400 630
Number of poles 2,3,4 3,4 3,4
Rated current In(A),at 40°C,50°C,55°C 100,125,140,160,180,200,225,250 250,315,350,400 250,315,350,400,500,630
Rated operating voltage Ue(V),AC 50/60Hz 400/415 400/415 400/415
Rated insulation voltage Ui (V) 800 800 800
Rated impulse withstand voltage Uimp(KV) 8 8 8
Breaking capacity designation C S M S M H S M H
Short-circuit breaking capacity Icu/Ics(kA) AC400/415V 25/18 35/25 50/35 35/25 50/35 70/50 35/25 50/35 70/50
Selectivity category A A A A A A A A A
Number of operating cycles
(cycle)
ON 6000 3000 3000
OFF 10000 8000 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) CHAC CQM6 MCCB outline dimension reference a b c and ca 3 P 105×165×70×95 105×165×93×118 140×257×107×156 140×257×107×156
4 P 140×165×70×95 140×165×93×118 185×257×107×156 185×257×107×156

Note: ● indicates an available optional accessory; – indicates that the accessory is not available.

Main Technical Parameters

Model number CQM6-800 CQM6-1250 CQM6-1600
Rated current of frame level Inm(A) 800 1250 1600
Number of poles 3,4 3,4 3
Rated current In(A),at 40°C,50°C,55°C 500,630,700,800 800,1000,1250 800,1000,1250,1400,1500,1600
Rated operating voltage Ue(V),AC 50/60Hz 400/415 400/415 400/415V 660/690V
Rated insulation voltage Ui (V) 800 1000 1000
Rated impulse withstand voltage Uimp(KV) 8 12 12
Breaking capacity designation S M H M H L M H
Short-circuit breaking capacity Icu/Ics(kA) AC400/415V 35/25 50/35 70/50 50/35 70/55 70/20 100/35 100/50
Selectivity category A A A A A A A A
Number of operating cycles
(cycle)
ON 1000 1000 500
OFF 3000 3000 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) CHAC CQM6 MCCB outline dimension reference a b c and ca 3 P 210×275×113×162 210×275×113×162 210×268×161×240
4 P 280×275×113×162 280×275×113×162

Note: ● indicates an available optional accessory; – indicates that the accessory is not available.

Operating Characteristics

The following table gives the inverse-time operating characteristics for distribution protection with all poles energised at an ambient temperature of +40°C, without humidity compensation.

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 1.30 <1h <2h Hot state

The following table gives the inverse-time operating characteristics for motor protection with all poles energised at an ambient temperature of +40°C, without humidity compensation.

Test current designation Setting current multiple Conventional time Initial state
In≤800
Conventional non-tripping current 1.0 ≥2h Cool state
Conventional tripping current 1.2 <2h Hot state

The operating-characteristics reference gives an instantaneous trip current setting of 10In for distribution protection. Confirm the applicable trip-unit setting for the ordered configuration.

The operating-characteristics reference gives an instantaneous trip current setting of 12In for motor protection.

The stated accuracy of the instantaneous trip current setting is 20% of the setting value.

CQM6-125 Operating Characteristic Curve

CHAC CQM6 MCCB - CQM6-125 Operating Characteristic Curve

CQM6-160 Operating Characteristic Curve

CHAC CQM6 MCCB - CQM6-160 Operating Characteristic Curve

CQM6-250 Operating Characteristic Curve

CHAC CQM6 MCCB - CQM6-250 Operating Characteristic Curve

CQM6-400 / 630 Operating Characteristic Curve

CHAC CQM6 MCCB - CQM6-400 / 630 Operating Characteristic Curve

CQM6-800 Operating Characteristic Curve

CHAC CQM6 MCCB - CQM6-800 Operating Characteristic Curve

CQM6-1250 Operating Characteristic Curve

CHAC CQM6 MCCB - CQM6-1250 Operating Characteristic Curve

CQM6-125~1250 Outline and Installation Dimensions(mm)

CHAC CQM6 MCCB - CQM6-125~1250 Outline and Installation Dimensions(mm)

CQM6-1600 Outline and Installation Dimensions(mm)

CHAC CQM6 MCCB - CQM6-1600 Outline and Installation Dimensions(mm)

Molded case circuit breaker Overall dimension Installation dimensions Boit
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
CQM6-125CSM 75 100 50 75 – – – – 130 114 85 50 48 – 91 73.4 2.4 68 61 23.9 24 25 111 M6
CQM6-160CS 90 120 60 90 – – – – 155 134 103 50 48 – 95 75.5 2.1 70 62 24 24.8 30 132 M8
CQM6-160M 90 120 60 90 – – – – 155 134 103 50 48 – 109.5 90 2.1 85 76.5 23.6 25 30 132 M8
CQM6-250CS 105 140 70 105 – – – – 165 144 102 50 97 – 95 74.2 2.7 70 61.4 22.3 23.1 35 126 M8
CQM6-250M 105 140 70 105 – – – – 165 144 102 50 95 – 118.5 97.7 2.7 93.4 84.8 22.9 23.3 35 126 M8
CQM6-400SMH 140 185 70 132 140 196 112 168 257 230 179 90 103 42 156 111.7 3.5 107.5 99.5 30.9 32.4 44 194 M10
CQM6-630SMH 400A 140 185 88 132 140 196 112 168 257 230 179 90 103 42 156 111.7 3.5 107.5 99.5 30.9 32.4 44 194 M10
CQM6-630SMH 630A 140 185 88 132 140 196 112 168 257 230 179 90 103 42 156 111.7 3.5 107.5 99.5 33.2 34 44 194 M10
CQM6-800SMH 630A 210 280 140 210 180 250 140 210 275 243 192 90 103 87 162.5 118 2.7 113.4 105.5 28.3 30.4 70 242.5 M12
CQM6-800SMH 800A 210 280 140 210 180 250 140 210 275 243 192 90 103 87 162.5 118 2.7 113.4 105.5 29 32.6 70 242.5 M12
CQM6-1250SMH 210 280 140 210 180 250 140 210 275 243 192 90 103 87 162.5 118 2.7 113.4 105.5 31.3 34.4 70 242.5 M10
CQM6-1600LMH 210 – 140 – – – – – 268 240 118 97 110 – 240 171 5 161 150 33 34 70 245.0 M10

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.

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30+

YEARS EXPERIENCE

Specialized in low-voltage electrical manufacturing

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1100+

EMPLOYEES

Professional team ensures stable quality and delivery

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100M+

POLES ANNUAL CAPACITY

Large-scale production capacity to meet global demand

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90%

AUTOMATED PRODUCTION

Advanced automation for high efficiency and consistency

CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

Automated Assembly Line

CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

Testing Laboratory

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Injection & Stamping

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Quality Inspection

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CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image
CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image
CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image
CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

Strict quality control system ensures every product meets global standards.

What Can We Customize?

For CQM6 projects, CHAC can review private-label marking, packaging, approved appearance options, published 16–1600A electrical configurations and technical-document requirements. Requests outside the published range are subject to engineering evaluation, testing, minimum order quantity and project feasibility.

CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

Enclosure
Design

Customized enclosure sizes, structures and installation details.

CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

Internal
Configuration

Flexible internal layout and component arrangement options.

CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

Branding &
Logo

Private label logos, nameplates and brand identification.

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Packaging
Design

Custom cartons, labels, manuals and packaging solutions.

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CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

Electrical
Configuration

Tailored electrical setup based on application requirements.

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CQM6 Standard Molded Case Circuit Breaker (MCCB) OEM Manufacturer product image

Certification
Support

Support for target-market standards and compliance requirements.

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Download

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CQM6 Series Moulded Case Circuit Breaker

Complete product overview for low-voltage electrical components and product selection reference.

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CQM6 Product FAQ

What is the CQM6 MCCB used for?

The CQM6 is specified for overload and short-circuit protection in AC systems at the voltage listed for the ordered frame within the published 16–1600A range. Suitability depends on the fault study, conductor coordination, enclosure and local rules.

How does the CQM6 molded case circuit breaker work?

The protection mechanism responds to the fault conditions stated for this model: overload and short-circuit protection. Trip behaviour, settings and interruption duty must be checked against the ordered frame and product instructions.

How do I choose the CQM6 rated current and poles?

Start with the design current and conductor calculation, then choose a published current within 16–1600A and poles from 2P / 3P / 4P, depending on frame; CQM6-1600: 3P. Neutral treatment, fault level, ambient conditions and coordination also need review.

What breaking capacity should I check on the CQM6?

Use the declared C/S/M/H/L classes, with Icu up to 100kA for the listed CQM6-1600 660/690V configurations; verify the exact frame and voltage for the exact frame, voltage and configuration. The prospective short-circuit current at the installation point must be within the applicable duty; a larger ampere value alone is not a selection rule.

Can the CQM6 replace an MCB or an earth-leakage device?

An MCCB is not automatically a like-for-like replacement. The CQM6 provides overload and short-circuit protection; residual-current protection, DC interruption, adjustable settings and other functions must be confirmed separately from the project requirement.

How should the CQM6 be installed and tested?

Use only the exact model drawing, terminal identification and accessory instructions. A qualified person should verify isolation, conductor size, torque, clearances, settings, fault duty and functional tests before energising the circuit.

Confirm the Right CQM6 Configuration

Send the frame, rated current, poles, protection function, system voltage, expected fault level, destination market and quantity. CHAC will review the request against the published model range.

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