CQM5L Series Residual Current Circuit Breaker
The CQM5L MCCB provides overload, short circuit and residual-current protection within its published 10–630A range. Specification should follow the system voltage, load, conductor coordination, prospective fault current and applicable rules—not the ampere value alone.
Product Overview
CQM5L is a residual current circuit breaker for AC 380/400/415V distribution and protection applications. Its published range covers 10–630A with 3P / 4P options. Selection depends on the complete power-system design, including fault level, coordination, conductor ampacity, enclosure conditions and local rules.
The saved model record lists IEC 60947-2 and GB/T 14048.2 as the applicable standard reference. No certification claim is added beyond the model record.
Key Features
Typical Applications
Typical applications include distribution and motor circuits where the project requires integrated residual-current protection. 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 CQM5L 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 | CQM5L reference | What the project must confirm |
|---|---|---|
| Rated current | 10–630A | Design current, conductor ampacity, installation method, temperature and grouping |
| Voltage | AC 380/400/415V | Supply system and equipment rating |
| Poles | 3P / 4P | Live conductors and neutral treatment |
| Trip / protection | thermal-magnetic trip | Load profile, fault response and coordination |
| Breaking capacity | 70kA Icu; 50kA or 70kA Ics by configuration | Prospective short-circuit current at the installation point |
Overcurrent vs Earth-Leakage Protection
An MCCB's overcurrent function does not replace residual-current protection. Select leakage sensitivity, delay and waveform type from the verified model data and project rules.
Leakage Protection
Confirm Leakage Selection →
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 CQM5L lists 70kA Icu; 50kA or 70kA Ics by configuration. 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 3P / 4P. Confirm which conductors must be switched, protected and isolated together.
System Arrangement
View MCCB Range →
Ordering Guide
- State the exact model: CQM5L.
- Provide frame and rated current within the published range: 10–630A.
- Confirm poles: 3P / 4P.
- Specify the trip unit or protection function: thermal-magnetic trip.
- Provide system voltage, frequency, application, expected fault level, destination market and quantity.
- 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.
Accessory List
Type designation
| Code Position | Code Symbol | Meaning & Explanation |
| ① | CQ | Enterprise Code: Zhejiang Chuangqi Electric Co., LTD. |
| ② | M | Product Category: Molded Case Circuit Breaker |
| ③ | 5 | Design Serial Number |
| ④ | L | Special Protection Function Residual Current Protection (Options: L=RC Protection) |
| ⑤ | 125 | Rated Frame Current (A): Options: 125, 250, 400, 630 |
| ⑥ | □ | Operation Mode: • (No Code) – Manual Direct Operation • Z – Rotary Handle Operation • P – Electric Operation |
| ⑦ | 4 | Number of Poles: • 3 – Three Poles • 4 – Four Poles |
| ⑧ | 300 | Trip Unit & Accessories Code: • 3 – Electronic Trip (Compound Trip) • 2 – Magnetic Trip Only (Single Magnetic Trip) • 00 – No Accessories (Refer to accessory table for specific codes) |
| ⑨ | □ | Application Type: • (No Code) – Distribution Protection • 2 – Motor Protection |
| ⑩ | B | N-Pole Type (For 4P products only, 3P has no code): • Type A: N-pole is always connected, without overcurrent release. • Type B: N-pole breaks with other poles, without overcurrent release. • Type C: N-pole breaks with other poles, with overcurrent release. • Type D: N-pole is always connected, with overcurrent release. |
| ⑪ | 125A | Rated Current: See technical parameter table for available values. |
| ⑫ | Y | Time-Delay Function • Y: With Delay • F: Without Delay |
| ⑬ | □ | Terminal & Connection Type: • (No Code) – Front Terminal Connection • B – Rear Terminal Connection • C – Plug-in Type |
Technical Specifications
| Model number | CQM5L-125 | CQM5L-250 | ||
| Rated current of frame level Inm(A) | 125 | 250 | ||
| Rated current In(A),at 40℃ | 10, 16, 20, 32, 40, 50, 63, 80, 100, 125 | 100, 125, 140, 160, 180, 200, 225, 250 | ||
| Rated operating voltage Ue(V) | AC380/400/415V | AC380/400/415V | ||
| Rated insulation voltage Ui (V) | 1000 | 1000 | ||
| Rated impulse withstand voltage Uimp(kV) | 8 | 8 | ||
| Mechanical life | 20000 | 20000 | ||
| Electrical life(AC415V) | 8000 | 8000 | ||
| Trip mechanisms and protection types | Thermal-magnetic trip | Thermal-magnetic trip | ||
| Selectivity category | A | A | ||
| Number of poles | 3P, 4P | 3P, 4P | ||
| Rated Ultimate Short-Circuit Breaking Capacity (Icu) (kA) | 70 | 70 | ||
| Rated Service Short-Circuit Breaking Capacity (Ics) (kA) | 50 | 50 | ||
| Rated Residual Operating Current (IΔn) | Time-delayed + Non-delayed | 100/300/500 | 100/300/500 | |
| Non-delayed only | 30/100/300/500 | / | ||
| Rated Residual Current Type | AC type | AC type | ||
| Rated Residual Making & Breaking Capacity (IΔm) | 1/4Icu | 1/4Icu | ||
| Phase spacing (mm) | 30 | 35 | ||
| Arc distance (mm) | ≤50 | ≤50 | ||
| Operating ambient temp | -35 ℃ to +70℃ | -35℃ to +70℃ | ||
| Accessory | Auxiliary contacts | ● | ● | |
| Alarm contacts | ● | ● | ||
| Shunt Release | ● | ● | ||
| Under-Voltage Release | ● | ● | ||
| Motor Operating Mechanism | ● | ● | ||
| Manual Handle Assembly | ● | ● | ||
| Fixed Type Rear-Mounting Kit | ● | ● | ||
| Plug-in Type, Front-of-Panel | ● | ● | ||
| Plug-in Type, Rear-of-Panel | ● | ● | ||
| Mechanical Interlock | ● | ● | ||
| Instantaneous protection | Power distribution protection | In≤40A: 400A; In≥50A: 10In | 10In | |
| Electric motor protection | In≤40A: 400A; In≥50A: 12In | 12In | ||
| Overall dimensions (mm) (L-W-H) |
 |
3 P | 155-90-90 | 165-105-103 |
| 4 P | 155-120-90 | 165-140-103 | ||
Note:● for optional accessories;”-”for no optional accessories.
| Model number | CQM5L-400 | CQM5L-630 | ||
| Rated current of frame level Inm(A) | 400 | 630 | ||
| Rated current In(A),at 40℃ | 225, 250, 315, 350, 400 | 400, 500, 630 | ||
| Rated operating voltage Ue(V) | AC380/400/415V | AC380/400/415V | ||
| Rated insulation voltage Ui (V) | 1000 | 1000 | ||
| Rated impulse withstand voltage Uimp(kV) | 8 | 8 | ||
| Mechanical life | 10000 | 10000 | ||
| Electrical life(AC415V) | 7000 | 7000 | ||
| Trip mechanisms and protection types | Thermal-magnetic trip | Thermal-magnetic trip | ||
| Selectivity category | A | A | ||
| Number of poles | 3P, 4P | 3P, 4P | ||
| Rated Ultimate Short-Circuit Breaking Capacity (Icu) (kA) | 70 | 70 | ||
| Rated Service Short-Circuit Breaking Capacity (Ics) (kA) | 70 | 70 | ||
| Rated Residual Operating Current (IΔn) | Time-delayed + Non-delayed | 100/300/500/1000 | 100/300/500/1000 | |
| Non-delayed only | / | / | ||
| Rated Residual Current Type | AC type | AC type | ||
| Rated Residual Making & Breaking Capacity (IΔm) | 1/4Icu | 1/4Icu | ||
| Phase spacing (mm) | 48 | 70 | ||
| Arc distance (mm) | ≤100 | ≤100 | ||
| Operating ambient temp | -35 ℃ to +70℃ | -35℃ to +70℃ | ||
| Accessory | Auxiliary contacts | ● | ● | |
| Alarm contacts | ● | ● | ||
| Shunt Release | ● | ● | ||
| Under-Voltage Release | ● | ● | ||
| Motor Operating Mechanism | ● | ● | ||
| Manual Handle Assembly | ● | ● | ||
| Fixed Type Rear-Mounting Kit | ● | ● | ||
| Plug-in Type, Front-of-Panel | ● | ● | ||
| Plug-in Type, Rear-of-Panel | ● | ● | ||
| Mechanical Interlock | ● | ● | ||
| Instantaneous protection | Power distribution protection | 10In | 10In | |
| Electric motor protection | 12In | 12In | ||
| Overall dimensions (mm) (L-W-H) |
|
3 P | 257-150-104.5 | 280-210-112 |
| 4 P | 257-198-104.5 | 280-280-112 | ||
Note:● for optional accessories;”-”for no optional accessories.
Dimensions (mm)
CQM5L-125
Front Terminal Connection Dimensions (X-X, Y-Y denote center points for 3P breakers)
CQM5L-250
Front Terminal Connection Dimensions (X-X, Y-Y denote center points for 3P breakers)
CQM5L-400
Front Terminal Connection Dimensions (X-X, Y-Y denote center points for 3P breakers)
CQM5L-630
Front Terminal Connection Dimensions
Note: Undefined tolerances comply with grade GB/T 1804-80.
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?
For CQM5L projects, CHAC can review private-label marking, packaging, approved appearance options, published 10–630A electrical configurations and technical-document requirements. Requests outside the published range are subject to engineering evaluation, testing, minimum order quantity and project feasibility.
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
CQM5 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.
CQM5L Product FAQ
What is the CQM5L MCCB used for?
The CQM5L is specified for overload, short circuit and residual-current protection in AC 380/400/415V systems within the published 10–630A range. Suitability depends on the fault study, conductor coordination, enclosure and local rules.
How does residual-current protection work in the CQM5L?
The residual-current function monitors imbalance associated with earth leakage and trips at the selected sensitivity or delay. The waveform type, threshold, time delay, earthing arrangement and local rules must be confirmed for the exact configuration.
How do I choose the CQM5L rated current and poles?
Start with the design current and conductor calculation, then choose a published current within 10–630A and poles from 3P / 4P. Neutral treatment, fault level, ambient conditions and coordination also need review.
What breaking capacity should I check on the CQM5L?
Use the declared 70kA Icu; 50kA or 70kA Ics by configuration 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 CQM5L replace an MCB or an earth-leakage device?
An MCCB is not automatically a like-for-like replacement. The CQM5L provides overload, short circuit and residual-current protection; residual-current protection, DC interruption, adjustable settings and other functions must be confirmed separately from the project requirement.
How should the CQM5L 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 CQM5L 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.
