Paidong Industrial Zone Qiligang,Yueqing City,Zhejiang province,China.
Paidong Industrial Zone Qiligang,Yueqing City,Zhejiang province,China.
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    21 Apr, 2023
    Posted by elcb_admin
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    Explore Power Distribution Box Types and Functions

    What is a Power Distribution Box?

    18 Ways IP66 PC Waterproof Distribution Box Switch Box Breaker Box
    18 Ways IP66 Waterproof Distribution Box

    Electrical distribution boxes are used in commercial and residential buildings and are part of the electrical system, also known as switchboards. It integrates power distribution, protection, and monitoring capabilities, and is responsible for distributing power to entire commercial or residential buildings. To put it bluntly, the distribution box is the control and distribution center of electricity.

    Distribution boxes vary in shape and structure due to different usage scenarios and requirements, but the basic components include fuses, circuit breakers, SPDs, switches, bypass devices, various insulating materials, wires, bus bars, and other components.

    In order to ensure the electrical safety of the building, the distribution box needs to have strict quality control, and must ensure function and use:

    1. Qualification of the components in the distribution box
    2. There should be enough space to place components in the distribution box, and it is necessary to ensure that the wires are convenient to connect
    3. The enclosure of the distribution box must be airtight, waterproof, and not easily corroded
    4. The wiring is regular, and the power distribution is simple and clear
    5. When the circuit is overheated or short-circuited, it can trip in time to ensure safety

    Types of Distribution Boxes and Their Functions

    According to different usage scenarios and requirements, there are several types of distribution boxes:

    1. Main Circuit Breaker Panel

    The main and most common distribution panel. Electricity travels through the wires first to a meter that records usage and then to a circuit breaker panel. The circuit breaker panel plays the role of protecting and monitoring the circuit during use. In the case of circuit overheating and short circuit faults, the components in the circuit breaker panel can detect the fault and cut off the circuit to prevent subsequent greater damage.

    2. Main Lug Panel

    The main lug panel is basically located downstream of the main circuit breaker panel and is a sub-panel used to increase the number of circuits. In the main lug panel, the upstream input wires are connected directly to the lugs. In use, it can share the load of the main circuit breaker panel to meet the increasing power demand.

    3. Sub Panel

    The relatively small size of the sub-panel allows for more detailed power distribution to specific areas or rooms. From the internal components, there is the position of the circuit breaker. In this way, specific areas or rooms can be protected during use.

    For places with special power requirements, in order not to affect the power consumption of other areas, it is more convenient to install and use a sub-panel. Such as garages, office rooms, etc.

    4. Fuse Box

    The fuse box uses disposable fuses to protect the circuit from damage caused by overloads and short circuits. Inside a fuse is a thin, fusible strip of metal called the fuse element. When the current passing through it reaches a certain value, it will heat up and melt to cut off the circuit.

    Fuses have a much faster reaction time than circuit breakers and are suitable for protecting sensitive electronic equipment.

    5. Transfer Switch

    The transfer switch can switch the load between the two power supplies. It is an electrical switch. When the main power supply fails or fails, the main power supply can be switched to the backup power supply through the transfer switch. On the market, there are manual transfer switches and automatic transfer switches. In comparison, the manual transfer switch is cheaper and easier to install, while the automatic transfer switch can automatically switch the power supply in time. For places with demand, automatic transfer switches are essential, such as hospitals and so on.

    Transfer switches are used in various scenarios. According to different needs, there are many specifications for transfer switches to choose from.

    What are the Requirements for the Material of the Distribution Box Shell?

    The distribution box is an indispensable part of the electrical system. Only when the shell quality meets the requirements can it be used safely and securely. The material of the distribution box shell should meet the following requirements:

    1. Anti-fall. The material needs to have basic strength to prevent the box from falling to the ground or being damaged by being hit by other objects.
    2. Non-flammable. While the installation location of the distribution box needs to be non-flammable, there are also requirements for the enclosure of the distribution box. In use, it can be ensured that the outside of the box and the inside of the box will not be affected by the flame.
    3. Resistance to leakage and surge. As a part of the electrical system, the distribution box cannot be easily damaged by current.

    Distribution Box Size

    Due to different usage scenarios and requirements, as well as considering the location of the actual wiring, the distribution box has a variety of sizes, which can be selected on the distribution box page.

    You can see how many circuits are on the periphery of the box to divide the circuit. 8 circuits and below will basically be used for home use, and more than 8 circuits will basically be used for commercial and factory power distribution. The greater the demand for circuit branches, the larger the distribution box can be selected to meet the demand.


    Distribution boxes are very important. It integrates wires, so there is no need to connect each device to the power supply separately, which saves the length of wires, simplifies the circuit structure, and ensures the efficiency of use. It can also ensure the safety of building electrical electricity.



    1. What’s in the distribution box?

    In the distribution box, commonly known as the distribution board or breaker panel, you’ll find several critical components responsible for managing and distributing electrical power throughout a building or home. These components typically include:

    Circuit Breakers:The primary safety device that prevents electrical overloads and short circuits.It has basic circuit protection functions, including overload protection, over-under-voltage protection, and so on.

    • Leakage Current Protection Switch:Also known as a main switch, it rapidly breaks an electrical circuit to prevent harm from an ongoing electric shock.
    • Dual Power Automatic Switch:Switches the power supply from the main grid to generator during outages.
    • Surge Protective Device (SPD):Protects the circuit from voltage spikes and surges.
    • Energy Meter:Monitors and records electricity usage.
    • Ammeter and Voltmeter:Measure the current and voltage, ensuring the distribution board works within the specified electrical parameters.


    2. How to install a distribution box?

    Installation of a distribution box is a critical task that should ideally be performed by a qualified electrician. However, providing a step-by-step guide can be informative for those interested in the process. It may include:

    • Pre-installation Planning:Assessing the space, understanding the power requirements, and selecting the correct distribution box size.
    • Mounting:Securely attaching the distribution box to the wall, considering ease of access and safety compliance.
    • Wiring:Connecting the mains supply to the distribution board and from there to various circuits, following all safety protocols.
    • Testing:Ensuring all connections are secure, and the distribution box is functional by testing the RCDs and breakers.


    3. What to Consider When Buying a New Circuit Breaker Distribution Box?

    When purchasing a new circuit breaker distribution box, several criteria should be considered:

    • Circuit Requirements:Considering the number and types of circuits in the property that the box needs to support.
    • Quality and Compliance:Selecting a UL-listed product for safety assurance and ensuring it meets local electrical codes.
    • Brand and Warranty:Considering reputable brands and those that offer a comprehensive warranty.
    • Box Size:Making sure the size of the box is adequate for both current requirements and potential future expansions.
    • Features:Looking into additional features like SPDs, RCDs, and ease of installation.
    • Price:Balancing the cost with the quality and feature set provided.

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