Issue: Loose connections inside the distribution board can lead to arcing, which creates heat and poses a fire risk. However, in actual applications, distribution boxes often encounter a series of problems, which not. An MCB Distribution Box (DB) is the central point of power distribution in any electrical installation—whether residential, commercial, or industrial. It houses Miniature Circuit Breakers (MCBs) that protect electrical circuits from overloads and short circuits. Always turn off the power before you start any inspection.