CQB2-125 Miniaturstromschutzschalter
Der CQB2-125 Miniatur-Leistungsschalter ist für den Überlast- und Kurzschlussschutz in stärkeren Wechselstromverteilungsnetzen ausgelegt. Er ist in den Ausführungen 63A, 80A, 100A und 125A mit C- oder D-Auslösekennlinien sowie in den Konfigurationen 1P, 2P, 3P oder 4P erhältlich. Die Baureihe verfügt über eine 10kA maximale Kurzschlussausschaltleistung und entspricht der Norm IEC 60947-2. Wählen Sie die Konfiguration entsprechend der Schaltungsauslegung, dem erwarteten Fehlerstrom, den Leiteranforderungen und dem Zielmarkt.
Produktübersicht
Der CQB2-125 ist ein Hochstrom-Wechselstrom-Miniaturleistungsschalter für kommerzielle, leichtindustrielle und infrastrukturelle Verteilungsstromkreise, die Überlast- und Kurzschlussschutz erfordern. Er ist in den Ausführungen 63A, 80A, 100A und 125A erhältlich, mit C- oder D-Auslösekennlinien sowie in den Konfigurationen 1P, 2P, 3P oder 4P. Die Serie bietet die Kurzschlusswerte 10kA Icu und 7.5kA Ics und ist nach IEC 60947-2 und GB/T 14048.2 ausgelegt.
Die Auswahl sollte auf der Grundlage des Bemessungsstroms, der Leiterkapazität, der Mastanordnung, des Einschaltstroms der Last, des voraussichtlichen Kurzschlussstroms sowie der Anforderungen des Zielmarktes erfolgen. Das CQB2-125 ist ein Wechselstromprodukt und darf nicht als Ersatz für einen Gleichstromschutzschalter, einen RCBO mit Fehlerstromschutz oder einen MCCB angesehen werden, der für eine einstellbare Schutzwirkung und höhere Kurzschlussbelastungen erforderlich ist.
Hauptmerkmale
Typische Anwendungen
Der CQB2-125 kann zur Schutzschaltung von Zuleitungen und stärkeren Ableitungen in kommerziellen Schalttafeln, der Energieverteilung in Hochhäusern, leichtindustriellen Schaltanlagen und Infrastrukturausrüstungen eingesetzt werden. Er ist nur geeignet, wenn die gewählte Nennstromstärke, die Auslösekurve, die Polkonfiguration und die Kurzschlussbemessungswerte mit der Schaltkreisberechnung übereinstimmen. Für Schaltkreise bis einschließlich 63A vergleichen Sie die CQB2-63; wenn einstellbare Einstellungen oder eine höhere Schaltbelastung erforderlich sind, prüfen Sie das MCCB-Programm.
Antragsformular und Auswahlhinweis
| Auswahlobjekt | Wie man es bewertet | CQB2-125-Optionen |
|---|---|---|
| Bemessener Strom | Bestätigen Sie den Bemessungsstrom, die Leitertragfähigkeit, die Verlegeart, die Umgebungstemperatur, die Gruppierung und die Koordination. Wählen Sie 125A nicht einfach deshalb aus, weil es die höchste verfügbare Nennleistung ist. | 63A, 80A, 100A, 125A |
| Auslösekurve | Vergleichen Sie den normalen Betriebsstrom, den Anlauf- oder Einschaltstrom sowie den Fehlerstromwert, der für einen rechtzeitigen magnetischen Auslösevorgang erforderlich ist. | C or D |
| Anzahl der Pole | Match the supply system and determine which live conductors must be switched and protected together under the project rules. | 1P, 2P, 3P, 4P |
| Short-circuit duty | Verify that the prospective short-circuit current and protection coordination are within the device ratings at the installation point. | Icu 10kA; Ics 7.5kA |
| Standard and documents | Check the product standard, destination-market rules and the exact documents required by the customer or approval body. | IEC 60947-2; GB/T 14048.2; CCC confirmed |
Compare current range, breaking capacity, tripping curves, pole configurations and protection functions before selecting a CQB2-125 miniature circuit breaker.
6kA vs 10kA MCB
Select breaking capacity according to the prospective short-circuit current at the installation point, not only the rated current of the circuit.
C Curve vs D Curve
Select the tripping curve according to the load’s inrush characteristics and the available fault current, not by current rating alone.
1P vs 2P vs 3P vs 4P
Choose the pole configuration from the supply arrangement and required common switching or isolation—not from panel space alone.
MCB vs RCBO
An MCB protects against overload and short circuit, while an RCBO also provides residual-current protection.
Need Help Selecting a CQB2-125 Configuration?
Share the rated current, pole configuration, tripping curve, system voltage, available fault-current information and quantity. CHAC will review the requested configuration and applicable documents.
CQB2-125 Ordering Guide
| Required information | Buyer selection |
|---|---|
| Product series | CQB2-125 |
| Bemessener Strom | 63A / 80A / 100A / 125A |
| Anzahl der Pole | 1P / 2P / 3P / 4P |
| Auslösekurve | C / D |
| Project details | System voltage, application and available fault-current information |
| Commercial details | Quantity, destination market, marking, packaging and required documents |
Installation Details to Confirm
How to Choose Between C and D Curves
C and D curves respond differently to short-duration inrush current. C curve is commonly evaluated for general distribution loads with moderate inrush, while D curve may be considered for equipment with higher starting current. These are selection tendencies, not universal assignments. Confirm that the chosen curve tolerates normal starting current while still providing the required fault protection and disconnection time.
How to Choose the Pole Configuration
Select 1P, 2P, 3P or 4P from the actual supply and isolation requirements. The design must identify which conductors require protection and common switching. Neutral treatment, earthing arrangement and local rules vary, so the pole configuration should be confirmed against the project drawings rather than selected from enclosure space alone.
When a 10kA MCB Is Required
The 10kA Icu value describes the rated ultimate short-circuit breaking capacity, not the normal load current. Use CQB2-125 only when the prospective short-circuit current, Ics requirement and protection coordination are within its published ratings. Where the required duty exceeds these values, select a suitably rated protective device or a verified coordinated solution.
CQB2-125 Type Designation
CQB2-125 C and D Tripping Curves
CQB2-125 Dimensions (mm)
Technische Spezifikationen
Use the table below to confirm voltage, rated current, poles, tripping curve, short-circuit duty, service life, protection degree, standard and certification for the CQB2-125 series. Final selection must be checked against the complete circuit design.
| Parameter | CQB2-125 |
| Rated voltage (V) | AC230V, AC400V |
| Rated current (A) | 63A, 80A, 100A, 125A |
| Anzahl der Pole | 1P, 2P, 3P, 4P |
| Kurvenverlauf | C, D |
| Rated short-circuit breaking capacity Icu (A) | 10000 A |
| Rated service short-circuit breaking capacity Ics (A) | 7500 A |
| Rated impulse withstand voltage Uimp (V) | 4000 V |
| Mechanical life | ≥ 8500 operations |
| Electrical life | ≥ 1500 operations |
| Schutzgrad | IP20 |
| Standards | IEC 60947-2, GB/T 14048.2 |
| Zertifizierung | CCC |
CQB2-125 Tripping Characteristics at 30°C Reference Temperature
| Artikel | Tripping Curve | Test current ln(A) | Erste Statusmeldung | Zeitrahmen für Auslösen oder Nichtauslösen | Erwarteter Ergebnis | Bemerkungen |
| a | C、D | 1.05ln | Kalt | 1h(In≤63A) | Nicht-Verletzung | Die Stromstärke steigt innerhalb von 5 Sekunden problemlos auf den vorgegebenen Wert an. |
| b | C、D | 1.3ln | Folgende Prüfung erfolgt nach Artikel a | 2h(ln>63A) | Tripping | |
| c | C、D | 2ln | Kalt | 1h(ln≤63A) | Tripping | |
| d | C | 8ln×80% | Kalt | 2h(In>63A) | Nicht-Verletzung | Schalten Sie die Stromversorgung ein, indem Sie den Hilfsschalter schließen. |
| D | 12ln×80% | 1s<t<300s | ||||
| e | C | 8In×120% | Kalt | t≤0.2s | Tripping | Schalten Sie die Stromversorgung ein, indem Sie den Hilfsschalter schließen. |
| D | 12ln×120% | t<0.2s |
Test note: “Cold” means the test is carried out at the reference calibration temperature without load before the test.
Reference Copper Conductor Cross-Sections
| Leiterquerschnitt (mm²) | Nennstrom In(A) |
| 16 | 63A |
| 25 | 80A |
| 35 | 100A |
| 50 | 125A |
Conductor note: These cross-sections are CQB2-125 product references. Final conductor sizing must follow the project design, installation method, ambient temperature, grouping, voltage-drop requirements and applicable local rules.
Warum CHAC wählen?
CQB2-125 production is supported by CHAC’s low-voltage manufacturing, assembly and quality-control system. Incoming components, assembly processes, operating checks and final inspection are managed against the approved product specification. The company-scale figures below describe CHAC’s overall manufacturing capability rather than a separate performance claim for this model.
30+
JAHRE ERFAHRUNG
Low-voltage product engineering and manufacturing experience
1100+
ARBEITER
Production, engineering and quality teams support project execution
100 Millionen+
JAHRESTERNE VON POLES
Company-wide annual pole capacity across supported product ranges
90%
AUTOMATISCHE PRODUZIERUNG
Automated processes support repeatable assembly and inspection
Automatisierte Montagelinie
Testlabor
Injektion und Stempeln
Qualitätskontrolle
Quality records and applicable product documents can be supplied for the confirmed CQB2-125 configuration. Certification and market-approval availability must be verified for the selected model.
Was können wir anpassen?
For CQB2-125 projects, CHAC can assess private-label marking, packaging, appearance, existing electrical configurations and technical-document requirements. Requests outside the published product range, including new electrical ratings or market approvals, are subject to engineering evaluation, testing and project feasibility.
Logo & Branding
Private-label marking and nameplate options are available subject to artwork review and sample approval.
Verpackung
Anpassung
Color boxes, cartons, labels and manuals can be prepared for the destination market and approved order specification.
Elektrisch
Anpassung
Select from the published 63–125A, 1P–4P and C/D options; requests outside this range require technical evaluation.
Produkt
Aussehen
Housing, handle and appearance options can be reviewed subject to tooling, MOQ and technical feasibility.
Zertifizierung
Support
Für die entsprechende genehmigte Konfiguration werden Datenblätter, Zeichnungen und verifizierte Zertifikatinformationen bereitgestellt.
Ingenieurwesen
Entwicklung
Project support can include drawing review, sample evaluation, testing and production planning, subject to technical approval.
Herunterladen
CQB2-Serie Miniaturstromschutzschalter
Download the CQB2 series overview for product selection reference. Confirm that each specification and document applies to the CQB2-125 configuration requested for your project.
Need CQB2-125 Technical Documents?
Request the applicable datasheet, drawings, verified certificate information, selection support or OEM/ODM project review.
CQB2-125 Miniature Circuit Breaker FAQ
Q1. What does 10kA mean on the CQB2-125 miniature circuit breaker?
The CQB2-125 has a rated ultimate short-circuit breaking capacity (Icu) of 10,000A and a rated service short-circuit breaking capacity (Ics) of 7,500A. The 10kA marking does not make the breaker suitable for every installation. The prospective short-circuit current at the installation point and the complete protection design must be checked before selection.
Q2. How do I choose between a C curve and D curve MCB?
Choose the curve according to the load’s inrush characteristics and the required protection coordination. C curve is commonly evaluated for general distribution loads with moderate inrush, while D curve may be considered for loads with higher starting current. The correct choice depends on the actual load and system study, not on rated current alone.
Q3. What is the difference between Icu and Ics?
Icu is the rated ultimate short-circuit breaking capacity. Ics is the rated service short-circuit breaking capacity and indicates the short-circuit duty after which the breaker is expected to remain suitable for continued service under the applicable test conditions. For CQB2-125, the listed values are 10kA Icu and 7.5kA Ics.
Q4. Can the CQB2-125 be used as a 125A DC circuit breaker?
No. The specifications on this page describe an AC 230/400V product. AC and DC interruption duties are not interchangeable. Use a breaker that is specifically rated and verified for the intended DC system when DC protection is required.
Q5. What cable size is required for a 125 amp circuit breaker?
The CQB2-125 product reference table pairs 125A with a 50mm² copper conductor; it also lists 16mm² for 63A, 25mm² for 80A and 35mm² for 100A. These are product references, not universal wiring rules. Final conductor sizing must account for installation method, temperature, grouping, voltage drop, conductor material and local electrical requirements.
Q6. When should I choose a 125A MCB instead of a 63A MCB or MCCB?
Consider CQB2-125 when the circuit design requires a 63A to 125A modular AC breaker and its fixed C or D curve, 10kA Icu and other listed characteristics meet the project. For lower-current circuits, a 63A-range MCB may be more appropriate. If adjustable protection, higher fault duty or more advanced coordination is required, evaluate an MCCB. The final decision should be made from the complete system study.
Build the Right CQB2-125 Configuration for Your Project
Send the required current rating, C or D curve, pole configuration, system voltage, destination market and estimated quantity. CHAC will review the specification and provide the applicable technical documents and commercial proposal.
