- displays the earth leakage current of the electrical installation
- trips an alarm if the earth leakage current exceeds the alarm threshold "I alarm" for time greater than the delay "t alarm"
- trips the installation protection circuit breaker via an MN or MX release if the earth-leakage current exceeds the fault threshold
- people against indirect contacts and provides complementary protection against direct contacts
- property against risk of fire
- earthing conductors