It's responsible for powering all the circuits in your home/office. It's made up of mains switch and circuit breakers. Always know where the consumer unit is located so as to turn it off or on in case of an emergency.

These are connected to two separate electric circuits. They essentially contain 2 switches which are linked together to complete the circuit either simultaneously or staggered- so as to isolate appliances safely.

It's an automatically operated electrical switch intended to prevent damage by tripping. The damage may occur due to excess current.