IL 5880.12 50-400HZ 220-240V (DOLD & SOEHNE)

The IL 5880 series Voltage Monitoring Relay for single and 3-phase AC-systems up to 0 to 500V and 10 to 1000Hz. The device is connected to the supply via terminals A1-A2. The unit can either be supplied from the monitored voltage system or from separate auxiliary supply. Terminal L is connected to the monitored voltage and PE to earth. If the insulation resistance RE drops below the adjusted alarm value RAL the red LED goes on and the output relay switches OFF. If the unit is on auto reset and the insulation resistance gets better (RE rises), the insulation monitor switches on again with a certain hysteresis and the red LED goes off. Without the bridge between LT1-LT2 the Insulation monitor remains in faulty state even if the insulation resistance is back to normal. The reset is done by pressing the internal or external reset button or by disconnecting the auxiliary supply. By activating the test button an insulation failure can be simulated to test the function of the unit.