ACB Main Distribution Switchboard

An ACB Main Distribution Switchboard is a floor-standing low-voltage assembly for high-current incoming power and centralized distribution. An Air Circuit Breaker (ACB) provides the main incoming switching and protection function, while copper busbars distribute power to outgoing feeder circuits.

The configuration is selected according to rated current, operating voltage, short-circuit level, feeder schedule, cable arrangement and installation space.

ACB Incomer
The main incoming section houses the ACB. Typical current ratings range from 400 A to 6300 A, subject to the electrical design.

Copper Busbars
Copper busbars connect the incoming section with outgoing feeders. Their size and arrangement are determined by current rating and short-circuit requirements.

Feeder Sections
Outgoing sections are arranged according to the feeder schedule, with dedicated space for protective devices and cable connections.

Cable Compartment
Cable termination areas accommodate incoming and outgoing conductors. Top or bottom cable entry can be specified according to the installation layout.

Rated Current
The ACB rating is selected from the calculated load current and incoming supply capacity, with coordination between the ACB and main busbar rating.

Short-Circuit Level
The required withstand rating is determined from the prospective fault current at the installation point.

Pole Configuration
3-pole or 4-pole arrangements are selected according to the distribution system and neutral switching requirements.

Protection Functions
Long-time, short-time and instantaneous protection functions can be specified according to the protection coordination requirements.

Industrial Plants
Used for main distribution supplying production equipment, utility systems and auxiliary loads.

Commercial Buildings
Applied in centralized electrical rooms serving multiple downstream distribution circuits and building services.

Infrastructure Facilities
Suitable for installations requiring high-current incoming protection and multiple outgoing feeders.

Electrical Rooms
The floor-standing arrangement provides defined sections for incoming power, busbars, feeders and cable connections.

Steel Structure
Formed steel panels provide the cabinet structure and mounting surfaces for electrical components.

Functional Separation
Incomer, busbar, feeder and cable areas can be arranged according to the required internal configuration and separation form.

Heat Dissipation
Component spacing, busbar arrangement and ventilation are considered according to rated current and internal heat generation.

Cable Access
Cable space is determined by conductor quantity, cable diameter, bending requirements and termination position.

Sheet Metal Processing
Panels are cut, formed, welded, drilled and surface-treated according to approved fabrication drawings.

Busbar Processing
Copper bars are cut, punched, drilled and formed before assembly. Connection positions follow the approved electrical layout.

Electrical Assembly
The ACB, feeder devices, busbar connections, control wiring and terminals are installed according to the electrical drawings.

Final Inspection
Checks cover cabinet dimensions, component identification, wiring, protective conductor continuity, insulation performance and assembly condition.

Electrical Data
System voltage, frequency, incoming current, short-circuit level and feeder ratings establish the main electrical configuration.

Feeder Schedule
Feeder quantity and ratings determine the arrangement of outgoing sections and termination space.

Mechanical Data
Cabinet dimensions, cable entry direction and available installation clearance are confirmed before fabrication.

Control and Metering
Metering, indication, control circuits and auxiliary interfaces can be incorporated according to the project drawings.

Single-Line Diagram
The single-line diagram defines the incoming arrangement, busbar structure and outgoing circuits.

Load Information
Incoming current, feeder ratings and system voltage provide the basis for ACB and busbar selection.

Cable Information
Cable size, quantity and entry direction determine the required termination space.

Installation Conditions
Room dimensions, access direction, maintenance clearance and required IP rating should be confirmed before production.

High-Current Distribution
The ACB configuration supports incoming current requirements typically ranging from 400 A to 6300 A.

Centralized Feeder Arrangement
Multiple outgoing circuits can be organized within one coordinated switchboard lineup.

Defined Internal Sections
Incomer, busbar, feeder and cable areas follow the electrical and mechanical configuration.

Project-Specific Layout
Busbar rating, feeder quantity, cabinet dimensions, cable entry and internal separation can be specified for the installation.

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