Electrical surges are more common than you realise and have the potential to damage wiring and appliances, as well as cause a fire or injury to those in the home or building. Safety switches are there to turn off the electricity in a specific area of the building as soon as they detect a surge or other type of electrical fault.
There are three types of safety switches: switchboard RCD, power point RCD and a portable RCD. Each type has a particular use, but each must be installed by a licensed electrician to ensure correct installation.