PXB6-125 Miniature Circuit Breaker
The PXB6-125 miniature circuit breaker provides overload and short-circuit protection within the published 10A–125A range. Its verified product data lists 12.5kA Icn; 7.5kA Ics, 1P / 2P / 3P / 4P and C / D. Final selection must match the conductor, load, prospective fault current, installation system and applicable local rules.
Product Overview
PXB6-125 is a 12.5kA Icn; 7.5kA Ics miniature circuit breaker covering 10A–125A. It is available with 1P / 2P / 3P / 4P and C / D trip options as stated in the product data.
The model data references IEC 60898-1; GB/T 10963.1. Standards, certification scope and technical documents must be confirmed for the ordered configuration and destination market.
Key Features
Typical Applications
It is intended for AC distribution circuits where the selected current rating, curve, pole arrangement and breaking capacity match the conductor and system study. Typical project contexts include residential, commercial and light-industrial final distribution; suitability depends on the actual circuit rather than the application label alone.
Applications and Selection Guide
Use the product-specific values below as a shortlist, then validate the complete circuit design. Product ratings do not replace a fault-current study, conductor calculation, coordination review or applicable installation rules.
| Selection point | PXB6-125 option | What the project must confirm |
|---|---|---|
| Rated current | 10A–125A | Coordinate with design current, conductor ampacity, ambient temperature and grouping |
| Trip curve | C / D | Choose for load inrush and required fault-clearing performance, not by current alone |
| Breaking capacity | 12.5kA Icn; 7.5kA Ics | Confirm against the prospective short-circuit current at the installation point |
| Pole arrangement | 1P / 2P / 3P / 4P | Match supply system and local switching or isolation rules |
| Installation interface | DIN-rail installation | Check enclosure, rail/base, terminal and conductor compatibility |
Breaking Capacity
12.5kA Icn; 7.5kA Ics is the published product value. Confirm the prospective short-circuit current at the installation point.
Trip and Load Behaviour
C / D is the available trip/protection option. Match it to load inrush and required disconnection performance.
Pole Configuration
Available arrangement: 1P / 2P / 3P / 4P. Confirm which conductors must be switched and protected under local rules.
MCB or RCBO
An MCB does not replace residual-current protection where an RCD or RCBO is required.
Ordering Guide
- Specify the exact model: PXB6-125.
- State the required current rating within 10A–125A.
- Confirm pole arrangement: 1P / 2P / 3P / 4P.
- Confirm trip or protection option: C / D.
- Provide system voltage, expected fault level, destination market, quantity and any document requirements.
Installation and Coordination Checks
- Verify conductor material and cross-section against the circuit calculation and the published terminal range.
- Confirm the prospective short-circuit current does not exceed the applicable breaking rating.
- Check upstream/downstream coordination, enclosure temperature, grouping, altitude and required clearances.
- Installation, isolation, testing and maintenance must be carried out by qualified personnel under applicable rules.
Type designation
Tripping curves
Dimensions(mm)
Technical Specifications
| Parameter | |
| Rated Voltage (V) | 230V (1P), 400V (2P, 3P, 4P) |
| Rated Impulse Withstand Voltage, Uimp (V) | 6000V |
| Rated Current (A) | 10, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125A |
| Rated Frequency | 50Hz |
| Number of Poles | 1P, 2P, 3P, 4P |
| Rated Ultimate Short-Circuit Breaking Capacity, Icn (A) | 12500A |
| Rated Service Short-Circuit Breaking Capacity, Ics (A) | 7500A |
| Mechanical Life (operations) | ≥10000 |
| Electrical Life (operations) | ≥4000 |
| Tripping Curves | C, D |
| Protection Class | IP20 |
| Installation Category | Ⅱ & Ⅲ |
| Standard | IEC60898-1, GB/T10963.1 |
Tripping Characteristics (Reference Temperature: 30°C)
| Item | Tripping Curve | Test Current (A) | Initial Status | Time limit for tripping or non-tripping | Expected result | Remarks |
| a | C, D | 1.05In | Cold | 1h(In≤63A) 2h(In>63A) |
Non-tripping | Current smoothly rises to specified value within 5s |
| b | C, D | 1.3In | Following item a test | 1h(In≤63A) 2h(In>63A) |
Tripping | |
| c | C, D | 2In | Cold | 1s<t<300s | Tripping | |
| d | C | 8In×80% | Cold | t ≤ 0.2s | Non-tripping | Switch on the power supply by closing the auxiliary switch |
| D | 12In×80% | Non-tripping | ||||
| e | C | 8In×80% | Cold | t < 0.2s | Tripping | Switch on the power supply by closing the auxiliary switch |
| D | 12In×80% | Tripping |
Note: The term “cold” means that the test is carried out at a reference calibration temperature without load before the test.
Conductor requirements and cross section
| Copper cross-section(mm²) | Rated current In(A) |
| 1 | In≤6 |
| 1.5 | 6 < In≤13 |
| 2.5 | 13 < In≤20 |
| 4 | 20 < In≤25 |
| 6 | 25 < In≤32 |
| 10 | 32 < In≤50 |
| 16 | 50 < In≤63 |
| 25 | 65 < In≤80 |
| 35 | 80 < In≤100 |
| 50 | 100 < In≤125 |
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 PXB6-125 projects, CHAC can review private-label marking, packaging, appearance, available electrical configurations and technical-document requirements. Requests outside the published range are subject to engineering evaluation, testing, MOQ and project feasibility.
Logo & Branding
Private-label marking and nameplate options are subject to artwork review and sample approval.
Packaging
Customization
Cartons, labels and manuals can be prepared for the approved order specification and destination market.
Electrical
Customization
Select from the published 10A–125A, 1P / 2P / 3P / 4P and C / D options; non-standard requests require technical evaluation.
Product
Appearance
Appearance options can be reviewed subject to tooling, MOQ, marking requirements and technical feasibility.
Certification
Support
Datasheets, drawings and verified certificate information are supplied for the applicable approved configuration.
Engineering
Development
Project support may include drawing review, sample evaluation, testing and production planning, subject to technical approval.
Download
PXB6 Series Miniature 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.
PXB6-125 Product FAQ
Is 2 AWG wire suitable for a 125A breaker?
No universal answer is safe because AWG ampacity depends on conductor material, insulation, temperature, termination rating, installation method and local code. PXB6-125 uses metric product references; the project designer must perform the final cable calculation.
What conductor size will fit the PXB6-125?
The published product reference associates 125A with up to 50mm² copper, with smaller references for lower ratings. Terminal fit does not prove ampacity; verify conductor calculation, termination data and installation conditions.
Can #4 copper be used on a 100A breaker?
That is jurisdiction- and installation-specific and cannot be confirmed from the breaker rating alone. For PXB6-125, use the published metric terminal reference and the applicable conductor-sizing rules rather than converting by assumption.
What does kA mean on the PXB6-125?
kA describes short-circuit interrupting duty, not rated load current. PXB6-125 publishes 12.5kA Icn and 7.5kA Ics, which must be checked against the prospective fault current and coordination requirements.
When is a higher-breaking-capacity MCB required?
It is required when the calculated prospective short-circuit current and coordination study demand that duty. The published Icn and Ics values must both be considered for the intended system.
How do I choose the correct PXB6-125 breaker?
Confirm 10A–125A rated current, C or D curve, 1P–4P arrangement, operating voltage, fault level, conductor calculation, enclosure conditions, standard and destination-market documents.
Confirm the Right PXB6-125 Configuration
Send your current rating, pole arrangement, trip option, system voltage, prospective fault level, destination market and quantity. CHAC will review the request against the published product range.
