1. Protection against overload and short-circuit currents.
2. Protection against the effects of sinusoidal alternating earth fault currents.
3. Protection against indirect contacts and additional protection against direct contacts.
4. Protection against fire hazard caused by insulation faults.
5. Used in residential building.
6. According to the type of instantaneous release classified as follows: type B(3-5)ln, type C(5-10)ln.