Question

What is a safety device to protest us from electric shock.

Answer 1

1)Fuse
A fuse is an electrical safety device that has the capability to protect a circuit from excessive current. It is designed to allow current through the circuit, but in the event that the current exceeds some maximum value it will open, severing the circuit. 2)Circuit breaker
Circuit breakers are devices that protect circuits from overload current conditions. They do the same job as fuses, but they are not destroyed when activated. They are more expensive to put in than fuses, but since components rarely need to be replaced may be cheaper in the long term. Circuit breakers are often considered safer since the user can't as easily disable them (like putting the wrong size fuse in place).
Circuit breakers functionally open a switch which turns off all the electrical current before the excess electrical current can start a fire. Before resetting the circuit breaker, always turn off or unplug the electronic devices that were being used with the breaker was activated. 3)Ground fault circuit interrupt
A ground fault circuit interrupt is a device designed to detect a tiny mismatch in currents (going into and out of the circuit), in order to prevent electrocution. They are mandatory in bathrooms and kitchens, and anywhere else in a house where water may come in contact with an electric circuit