People often use “MCB” and “DB” as if they mean the same thing. They are related, but not identical.
What is an MCB?
An MCB (miniature circuit breaker) is a switch that automatically cuts power when a circuit is overloaded or short-circuited. Each MCB protects one circuit, such as lights, sockets or a geyser, and each has a current rating that must match the cable and load.
What is a DB box?
A DB (distribution board) is the enclosure that holds the main switch, MCBs and other protection devices. It receives power from the supply and distributes it to separate circuits around the building.
How they work together
Think of the DB as the control room and each MCB as a guard on one door. If one circuit has a problem, only that MCB trips, and the rest of the building keeps power.
Signs you need an upgrade
- Old rewirable fuses instead of MCBs
- No spare ways for new circuits
- Unlabelled breakers that nobody can identify
- Rust, burn marks or loose wires inside the board
- You have added heavy appliances since the board was installed
What a good installation looks like
Correctly rated breakers, clear labels, tidy termination, proper earthing and spare ways for future needs.
Learn more about our MCB installation and DB installation services.
