A fuse is the old fashion way to protect against overloading your circuits. A circuit breaker is a modern way to do the same thing with more accuracy. It also provides an easier way to restore power by simply flicking the switch. A safety switch, or RCD (residual current device) protects against current leaking to earth – such as the metal on appliances. It detects when there is an imbalance in the circuit – like electricity flowing through a human when it shouldn’t be. If you still have fuses, it is recommended that you get them replaced with circuit breakers and safety switches. Again, there are many options.