Distribution Boards

Distribution boards are the central protection and control point of any low-voltage electrical system, routing incoming supply to individual circuits through a main switch, circuit breakers and earth leakage units. They are specified across residential, commercial and industrial installations in both single-phase and three-phase configurations.

Our stock range at RS Australia covers compact electrical distribution panels through to heavy-duty electrical power distribution board assemblies for industrial sites, in a breadth of current ratings, pole counts and enclosure ratings to match different requirements.

How Does a Distribution Board Work?

A distribution board is the central hub of power where the main cable enters the board and is routed to secondary circuits. Inside the enclosure, you will find the main switch, circuit breakers, earth leakage units and bus bars. All of these devices work together to protect the system and linked equipment from hazards caused by short circuits, earth leakage or overload.

Every distribution board, electrical panel board or electrical distribution box is designed around these core protection functions. In Australia and New Zealand, low-voltage switchgear and controlgear assemblies are governed by AS/NZS 61439.

Single-Phase vs. Three-Phase Distribution Boards

Single-Phase Distribution Boards

A single phase distribution panel board operates on a two-wire supply (active and neutral) and is typical for residential properties, small commercial premises and light commercial loads. Standard current ratings generally span 40A to 125A, suiting lighting circuits, general power outlets and small appliance loads.

Three-Phase Distribution Boards

A three-phase electrical distribution panel operates on a four-wire supply (three actives and a neutral) and is preferred for industrial facilities, manufacturing plants, large commercial buildings and sites running heavy machinery. Three-phase supply delivers higher power density and balanced loading, making it the default choice for any electrical power distribution board serving motors, HVAC plant or process equipment.

To determine which phase type is required, confirm the incoming supply configuration from the distribution network, calculate total connected load and assess site layout and future expansion needs.

Key Benefits of Distribution Boards

Specifying a properly rated distribution panel board delivers measurable operational and safety advantages across commercial and industrial installations:

• Safe and controlled power distribution across multiple circuits, significantly reducing overload risk on any single feeder.
• Integrated protection for equipment and personnel through circuit breakers, residual current devices (RCDs) and earth leakage units.
• Scalable circuit configurations to suit single-phase residential loads through to three-phase industrial systems with high short-circuit ratings.
• Simplified maintenance and fault isolation, allowing individual circuit control and repair without disrupting the wider electrical system.

Applications of Distribution Boards

Distribution boards are specified across industrial and commercial sectors wherever reliable, compliant power distribution is required.

• Industrial manufacturing facilities: Three-phase electrical distribution panel boards handle high-load machinery, motor control centres and process equipment.
• Commercial buildings: Tiered power distribution boards with main switchboards are used to feed sub-distribution and floor-level boards for tenancy power and lighting.
• Construction sites: Both temporary and permanent distribution panel assemblies are used to energise site offices, plant equipment and power tools, with construction-specific boards verified against AS/NZS 61439.4.
• Data centres: Distribution boards with redundancy, monitoring and metering for critical power distribution are typically paired with UPS and backup generation in server rooms.
• Residential buildings: These premises typically use single-phase consumer units for general circuit protection.

Buy Distribution Boards Online from RS Australia

RS is a trusted manufacturer, supplier and distributor of electrical distribution boxes in Australia, stocking leading brands including Eaton, HENSEL and Schneider Electric. Browse related categories such as busbar trunking, surge protection devices and thermal breakers to complete your specifications.

Place your order online for same-day dispatch on in-stock items, with delivery reaching most Australian metro and regional addresses inside 2 to 4 business days. Please check out our delivery page for more information on shipping timelines and options.