Understanding Db Boards: Essential Components of Distribution Systems

The distribution board (DB board) is an essential component of any electrical distribution system that controls energy flow to various circuits and appliances.

A DB board, the “heart of the electrical system,” is a centralised device that distributes electricity from the primary power supply to specific circuits or subcircuits.

This article examines the essential parts of distribution boards and emphasises how they ensure electrical performance and safety.

Main Switch And Incoming Power

The element of a db board, the main switch, is the entranceway for incoming electrical power. It offers an essential safety feature during maintenance or emergencies, allowing users to isolate the electrical installation from the main supply completely.

The primary switch is fitted with circuit breakers or fuses to trip or blow in the case of an overload or short circuit to safeguard the system and its users from electrical risks.

Circuit Breakers

Circuit breakers are essential elements of distribution boards that safeguard circuits against overloading or short circuits. When the current reaches a preset limit, they automatically trip, turning off the power supply to the corresponding circuit.

Different circuit breakers exist, including residual current circuit breakers (RCCBs) and tiny circuit breakers (MCBs). MCBs provide Overcurrent protection, while RCCBs provide extra protection from electric shock and ground faults.

Busbars And Neutral Links

Busbars are metal bars that distribute electricity throughout a DB board as conductors. From the main switch or circuit breakers, they are in charge of transferring the current to the various circuits.

Whereas neutral linkages make it easier for the current to return to its source. Busbars and neutral links must get installed properly to provide effective power distribution and avoid overheating or voltage dips within the system.

Residual Current Devices (Rcds)

RCDs are crucial safety tools that offer defence from electric shocks and ground faults. They keep an eye on the current flow in both the live and neutral conductors and trip immediately if there is an imbalance.

RCDs, particularly in damp or high-risk places like bathrooms or outdoor installations, can avoid potentially life-threatening electrical mishaps by detecting even minute variations in current. RCDs are frequently installed as independent units or integrated into DB boards, depending on the local electrical codes in each area.

Surge Protection Devices (SPDs)

Electrical equipment can sustain considerable damage from voltage surges or unexpected spikes. SPDs shield delicate electronics and appliances from these voltage surges.

SPDs save expensive damage and downtime by directing extra power to the ground. Although SPDs get frequently installed at the main distribution board, some applications may call for additional safety at the circuit level.


Maintaining electrical safety, avoiding overloads, and protecting priceless equipment depends on understanding the roles and significance of these components.

Individuals and organisations can ensure dependable power distribution and reduce the hazards related to electrical systems by investing in high-quality DB boards and ensuring correct installation and maintenance.

Do check out Legrand’s website for more information and details!

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