Types of Main Distribution Boxes

Main distribution boxes include Main Distribution Boards (MDBs), Sub Distribution Boards (SDBs), meter panels, fuse banks, unitized panels, and specialized control or consumer units, each designed for specific power distribution needs.

Main Types of Distribution Boxes

1. Main Distribution Board (MDB) The MDB is the primary control panel for an entire building or facility. It receives high-voltage, high-amperage power from the utility or transformer and distributes it to sub-distribution boards and major electrical loads. MDBs typically contain the main incoming breaker, busbars, and outgoing feeders. They are used in large commercial buildings, industrial plants, high-rise residential complexes, and power stations, designed to handle very high fault currents and often custom-built for specific projects . 2. Sub Distribution Board (SDB) SDBs are secondary panels that receive power from the MDB and distribute it to specific areas, floors, or machinery groups. They provide localized control and protection, making it easier to isolate and troubleshoot issues without affecting the entire system. SDBs are smaller than MDBs and are commonly used in offices, factories, hospitals, and residential complexes . 3. Meter Panel Meter panels are distribution boxes that house electrical meters to monitor power consumption. They include primary switches, fuses, and circuits, often with Residual Current Devices (RCDs) for safety. Meter panels are widely used in residential and industrial settings to track electricity usage and ensure safe distribution . 4. Panel Fuse Bank An older type of distribution box, fuse banks use fuses for overcurrent protection. When a circuit overloads, the fuse melts, breaking the circuit. While reliable, they are not resettable and require spare fuses. Fuse banks are still found in older homes and some industrial applications . 5. Unitized Panel Unitized panels are modular, pre-assembled units combining circuit breakers, metering, and control devices. They are compact and ready to install, ideal for industrial settings, data centers, or renewable energy projects where space and installation speed are critical . 6. Transfer Switch Transfer switches are specialized distribution boxes that allow switching between two power sources, such as utility power and a generator. They ensure continuous power supply during outages and are commonly used in hospitals, data centers, and critical infrastructure . 7. Consumer Unit Consumer units, often found in residential buildings, distribute electricity to individual circuits like lighting, outlets, and appliances. They include miniature circuit breakers (MCBs) and RCDs for protection and are designed for easy access and maintenance . 8. Enclosed Switchgear Enclosed switchgear boxes integrate multiple control and protection devices in a single enclosure. They are used in industrial and commercial facilities to manage high-power circuits safely and efficiently .

Additional Types and Configurations

• Surface Mounted DB Boxes: Installed on walls, suitable for retrofits and industrial environments .
• Flush Mounted DB Boxes: Embedded into walls for aesthetic purposes, common in residential and commercial buildings .
• Pole Mounted DB Boxes: Designed for outdoor use, such as street lighting or utility applications .
• Single Phase and Three Phase DB Boxes: Single-phase for residential or small commercial loads; three-phase for industrial or large commercial facilities .
• Lighting and Power Distribution Boxes: Dedicated to lighting circuits or heavy machinery, respectively .
• Control Distribution Boxes: Include relays, contactors, and timers for automation and control purposes . Modern distribution boxes may also feature smart monitoring, energy management, and predictive maintenance capabilities, enhancing safety and efficiency in both residential and industrial applications .