The electricity that powers your home has one source, the consumer unit otherwise known as the fuse box.A consumer unit is a type of distribution board a component of an electrical power system within which an electrical power feed provides supply to subsidiary circuits.
source/image(PrtSc): The Engineering Mindset
How do consumer units work. Learn the service head, fuse, circuit breaker, miniature circuit breaker, residual current device, live, phase, neutral, earth, bus bar, main breaker, RCD, MCB in this video.
Modern consumer units usually use DIN-rail mount breakers. The rail and the shape of the front opening are standardized but the busbar arrangements are not. Therefore, mixing of brands should generally be avoided and, where unavoidable, care should be taken to ensure that the breaker chosen is a good fit for the busbars.
The choice of consumer unit will reflect several factors such as the size and layout of the dwelling, number of floors, outbuildings, the expected load levels (ovens, showers, immersion heaters, electric blankets, car-chargers etc.), and how much protection is required for each circuit./ The Engineering Mindset