- The WRN-22 relay is an earth leakage relay with a built-in earth leakage transformer, with a diameter Ø 22 mm
- DIN 46277 Symmetrical profile coupling (EN 50022)
- The leakage is detected by means of sampling the earth leakage intensity and calculating its true root mean square (TRMS)
- Detection of the presence of voltage with LEDs
- TEST button.