Safety switches are often confused with circuit breakers. Here is a handy guide to understanding the difference:
Circuit breakers provide short circuit and over current protection such as when a power point is overloaded. Circuit breakers do not act as a safety switch for personal protection against electric shock.
Safety switches monitor the flow of electricity through a circuit and detect a problem that may pose a risk to personal safety and turn the power off within 0.03 of a second. Safety switches always have a test button, have 30ma written on them and are also sometimes labelled with the words "safety switch".