Digital monitoring relay for residual current monitoring with residual-current transformer 3UL23 for IO-Link Setting range 0.03 A to 40 A separate for warning threshold and switch-off value ON delay and tripping delay 0 to 999.9 s Shutdown hysteresis up to 50% Warning hysteresis 5% fixed Width 22.5mm, 2 change-over contacts with or without fault buffer screw terminal