CQM7DC Series Molded Case Circuit Breaker
Der CQM7DC MCCB provides overload and short-circuit protection for DC systems within its published 63–1600A range. Specification should follow the system voltage, load, conductor coordination, prospective fault current and applicable rules—not the ampere value alone.
Product Overview
CQM7DC is a dc MCCB for 1500V DC distribution and protection applications. Its published range covers 63–1600A with 2P / 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 UL 489 requirements listed on the page as the applicable standard reference. No certification claim is added beyond the model record.
Key Features
Typical Applications
Typical applications include solar PV, EV charging and energy-storage distribution where the complete DC fault study supports the rating. 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 CQM7DC 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 | CQM7DC reference | What the project must confirm |
|---|---|---|
| Rated current | 63–1600A | Design current, conductor ampacity, installation method, temperature and grouping |
| Spannung | 1500V DC | Supply system and equipment rating |
| Masten | 2P / 3P / 4P | Live conductors and neutral treatment |
| Trip / protection | 5In or 10In instantaneous setting | Load profile, fault response and coordination |
| Ausschaltvermögen | Icu/Ics values vary by voltage and frame; verify the ordered table | Prospective short-circuit current at the installation point |
AC MCCB vs DC MCCB
DC interruption is not interchangeable with AC interruption. Use the CQM7DC voltage, pole, arc-distance and fault-duty data for the intended PV, EV or storage circuit.
DC Interruption
Review DC MCCB Range →
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 CQM7DC lists Icu/Ics values vary by voltage and frame; verify the ordered table. 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. Confirm which conductors must be switched, protected and isolated together.
System Arrangement
View MCCB Range →
Ordering Guide
- State the exact model: CQM7DC.
- Provide frame and rated current within the published range: 63–1600A.
- Confirm poles: 2P / 3P / 4P.
- Specify the trip unit or protection function: 5In or 10In instantaneous setting.
- 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.
Type designation
Accessory List
Note: Code 50:For models 125 and 160, a custom left-side undervoltage release is required. For model 250, a custom left-side shunt release is required.Optional voltage ranges for shunt/undervoltage releases:DC24V, DC110V, DC220V, AC230V, AC400V.Standard production voltage: AC230V.
Technical Specifications
| Parameter | CQM7DC-320 | CQM7DC-630 | CQM7DC-1600 |
| Rated Current (A) | 63, 80, 100, 125, 140, 160, 180, 200, 225, 250, 315, 320 | 225, 250, 320, 350, 400, 500, 630 | 800, 1000, 1250, 1500, 1600 |
| Number of Poles | 2P | 2P | 3P,4P |
| Rated Operational Voltage Ue DC (V) | 1500 | 1500 | 1500 |
| Rated Insulation Voltage Ui (V) | 1800 | 1800 | 1800 |
| Rated Impulse Withstand Voltage Uimp (kV) | 12 | 12 | 12 |
| Power Frequency Withstand Voltage (1 min) (kV) | 3.5 | 3.5 | 3.5 |
| Rated Ultimate Short-Circuit Breaking Capacity Icu | DC1200V DC1500V | DC750V DC1000V | DC750V DC1000V DC1200V DC1500V |
| Rated Service Short-Circuit Breaking Capacity Ics (kA) | 35kA 20kA | 85kA 50kA | 50kA 30kA 15kA 10kA |
| Mechanical Life (operations) | 4000 | 4000 | 4000 |
| Electrical Life (operations) | 10000 | 10000 | 500 |
| Arc Chute Distance (mm) | 50 / 0 | 50 / 0 | 50 / 0 |
| Dimensions W×L×H (mm) | 90×215×136 | 110×275×152 | 3P: 210×340×244 4P: 280×340×244 |
| Instantaneous Trip Setting | 5In or 10In | 5In or 10In | 5In or 10In |
| Reference Ambient Temperature (℃) | 50 | 50 | 50 |
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 CQM7DC projects, CHAC can review private-label marking, packaging, approved appearance options, published 63–1600A 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.
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Weitere Produkte
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Need Technical Documents?
Contact us for datasheets, certificates, drawings, selection guidance or OEM/ODM project support.
CQM7DC Product FAQ
What is the CQM7DC MCCB used for?
The CQM7DC is specified for overload and short-circuit protection for DC systems in 1500V DC systems within the published 63–1600A range. Suitability depends on the fault study, conductor coordination, enclosure and local rules.
What is the CQM7DC 1500V DC rating?
The page lists 1500V DC as the rated operational voltage. DC interruption is not interchangeable with AC interruption, so the pole arrangement, arc path, fault current and installation instructions must be checked for the actual PV, EV or storage circuit.
How do I choose the CQM7DC rated current and poles?
Start with the design current and conductor calculation, then choose a published current within 63–1600A and poles from 2P / 3P / 4P. Neutral treatment, fault level, ambient conditions and coordination also need review.
What breaking capacity should I check on the CQM7DC?
Use the declared Icu/Ics values vary by voltage and frame; verify the ordered table 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 CQM7DC replace an MCB or an earth-leakage device?
An MCCB is not automatically a like-for-like replacement. The CQM7DC provides overload and short-circuit protection for DC systems; residual-current protection, DC interruption, adjustable settings and other functions must be confirmed separately from the project requirement.
How should the CQM7DC 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 CQM7DC 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.
