A distribution board (also known as panel board, breaker panel, or electric panel) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits, while providing a protective fuse or circuit breaker for each circuit in a common enclosure. Normally, a main switch, and in recent boards, one or more residual-current devices (RCD) or residual current breakers with over current protection (RCBO), are also incorporated.

Power Distribution is a system, consisting of a Main Distribution Board (MDB), Sub Main Distribution Boards (SMDBs) and Final Distribution Boards, by which the electrical energy is transmitted via branches to reach the exact end user.
An MDB is a panel or enclosure that houses the fuses, circuit breakers and ground leakage protection units where the electrical energy, which is used to distribute electrical power to numerous individual circuits or consumer points, is taken in from the transformer or an upstream panel. An MDB typically has a single or multiple incoming power sources and includes main circuit breakers and residual current or earth leakage protection devices. A MDB is comprised of a free standing enclosure, a bus bar system, MCCB’s, metering and support equipments and required current transformers. Panels are assembled in a systematic manner such as incomer section and outgoing section.

MDB is a panel or enclosure that houses the fuses, circuit breakers and ground leakage protection units where the electrical energy is used to distribute electrical power to numerous individual circuits or consumer points is taken in from the transformer or an upstream panel. It typically has a single or multiple incoming power source and includes main circuit breakers, residual current or earth leakage protection devices. It is comprised of a free-standing enclosure, a bus bar system, MCCB’s, metering, supporting equipments and appropriate current transformers. Panels are then assembled in a systematic manner such as incoming and outgoing section.

The MDB then feeds SMDBs which are installed midway through the power distribution system at a point where the large distribution cable terminates and several smaller sub-circuits begin. These switchboards are larger than a final distribution board circuit although they have similar construction process.