PXB6-63 Miniature Circuit Breaker
The PXB6-63 miniature circuit breaker provides overload and short-circuit protection within the published 6A–63A range. Its verified product data lists 6kA Icu = Ics, 1P / 2P / 3P / 4P and B / C / D. Final selection must match the conductor, load, prospective fault current, installation system and applicable local rules.
Product Overview
PXB6-63 is a 6kA Icu = Ics miniature circuit breaker covering 6A–63A. It is available with 1P / 2P / 3P / 4P and B / C / D trip options as stated in the product data. It provides overload and short-circuit protection and positive isolation.
The updated model data references IEC 60898-1; GB/T 10963.1 and lists CE, CB and CCC certification, together with DEKRA certification. 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, high-rise and 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 | PXB6-63 option | What the project must confirm |
|---|---|---|
| Rated current | 6A–63A | Coordinate with design current, conductor ampacity, ambient temperature and grouping |
| Trip curve | B / C / D | Choose for load inrush and required fault-clearing performance, not by current alone |
| Breaking capacity | 6kA Icu = 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 | 45mm terminal-centre reference | Check enclosure, rail/base, terminal and conductor compatibility |
Breaking Capacity
6kA Icu = Ics is the published product value. Confirm the prospective short-circuit current at the installation point.
Trip and Load Behaviour
B / 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: PXB6-63.
- State the required current rating within 6A–63A.
- Confirm pole arrangement: 1P / 2P / 3P / 4P.
- Confirm trip or protection option: B / C / D.
- Provide system voltage, expected fault level, destination market, quantity and any document requirements.
Ordering Specification
Please specify the following when ordering:
- Product model: PXB6-63.
- Number of poles: 1P, 2P, 3P or 4P.
- Rated current and tripping curve, for example C/16A:
- Tripping curve (type): B, C or D.
- Rated current (In): 6, 10, 16, 20, 25, 32, 40, 50 or 63 A.
- Quantity, for example 120 pcs.
Ordering example: PXB6-63 1P C/16A, 120 pcs. This is an example order, not a minimum order quantity.
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 | Specification |
| Rated Insulation Voltage (Ui) | 500V |
| Rated Impulse Withstand Voltage (Uimp) | 4000V |
| Rated Current (In) | 6, 10, 16, 20, 25, 32, 40, 50, 63 |
| Rated Frequency | 50Hz / 60Hz |
| Number of Poles | 1P, 2P, 3P, 4P |
| Rated Short-Circuit Breaking Capacity (Icu = Ics) | 6000A |
| Mechanical Endurance | 20000 |
| Electrical Endurance | 10000 |
| Tripping Curves | B, C, D |
| Terminal Center Distance | 45mm |
| Protection Class | IP20 |
| Standard | IEC 60898-1; GB/T 10963.1 |
| Certification | CE · CB · CCC | DEKRA Certified |
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 | B, C, D | 1.13In | Cold | t ≤ 1h | Non-tripping | Current smoothly rises to specified value within 5s |
| b | B, C, D | 1.45In | Following item a test | t < 1h | Tripping | |
| c | B, C, D | 2.55In | Cold | 1s < t < 60s (In ≤ 32A) 1s < t < 120s (In > 32A) |
Tripping | |
| d | B | 3In | Cold | t ≤ 0.1s | Non-tripping | Switch on the power supply by closing the auxiliary switch |
| C | 5In | |||||
| D | 10In | |||||
| e | B | 5In | Cold | t < 0.1s | Tripping | Switch on the power supply by closing the auxiliary switch |
| C | 10In | |||||
| D | 20In |
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 |
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 PXB6-63 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 6A–63A, 1P / 2P / 3P / 4P and B / 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.
PXB6-63 Product FAQ
What does the 6kA rating on the PXB6-63 MCB mean?
It is the published short-circuit breaking capacity, stated as 6kA Icu = Ics for the relevant product data. It does not describe normal circuit loading.
What is the difference between a 6A MCB and a 6kA MCB rating?
6A is a rated-current value for normal load and conductor protection; 6kA is 6,000A of short-circuit interrupting capacity under stated conditions. They describe different functions.
How many amperes is 6kA?
6kA equals 6,000A. This is a fault-current value, while PXB6-63 continuous rated-current options are published separately as 6A–63A.
What is the main difference between 6kA and 10kA breakers?
The main difference is the stated short-circuit breaking capacity. Select the required level from the prospective fault current, product standard and coordination study.
Would a higher kA breaker always be better than PXB6-63?
Not by itself. A higher verified duty may be required for a higher fault level, but curve, rated current, poles, voltage, standard, dimensions and coordination must also match.
Does kA determine the maximum normal load of a breaker?
No. kA relates to short-circuit interruption. Normal load is governed by the ampere rating, conductor design, installation conditions and applicable rules.
How does the PXB6-63 miniature circuit breaker work?
PXB6-63 automatically opens the circuit when an overload or short circuit triggers its protective mechanism. Its thermal response allows a time delay for overloads, while its magnetic response operates at higher fault currents according to the selected B, C or D curve. Use the published time-current characteristics to check the required disconnection time for your circuit.
How do I choose the rated current for a PXB6-63 MCB?
PXB6-63 is available in 6, 10, 16, 20, 25, 32, 40, 50 and 63 A ratings. Choose a rating that suits the design load and protects the cable within its calculated current-carrying capacity. Account for installation method, ambient temperature, grouping, load inrush and local electrical rules. The 63 A frame designation does not mean every circuit should use a 63 A breaker.
What do B, C and D tripping curves mean for PXB6-63?
The curves distinguish the magnetic tripping bands: B is 3–5 times rated current, C is 5–10 times and D is 10–20 times. These are current multiples, not operating-time values. PXB6-63 offers all three curves. Select a curve that accommodates the actual load inrush while meeting fault-disconnection requirements; do not move to C or D simply to stop unexplained tripping.
How do I choose between 1P, 2P, 3P and 4P PXB6-63 breakers?
PXB6-63 is available in 1P, 2P, 3P and 4P configurations. Choose according to the supply arrangement and which conductors must be switched and protected together. A single-phase circuit may require one-pole or two-pole switching, while three-phase circuits may require three-pole or four-pole switching. Confirm neutral treatment, the product connection diagram and local installation rules rather than selecting by pole count alone.
Can an RCCB replace the PXB6-63 MCB?
An RCCB does not replace PXB6-63 overload and short-circuit protection. An RCCB detects residual current, whereas PXB6-63 is an MCB and does not provide residual-current protection. Where both functions are required, the circuit needs a suitably coordinated MCB and RCCB, or an appropriate RCBO combining the two functions. Select residual-current type and sensitivity according to the application and local rules.
Confirm the Right PXB6-63 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.
