MAIN CHARACTERISTICS range VIGILOHM range of product VIGILOHM product name VIGILOHM IM device short name IM9 product or component type INSULATION MONITORING DEVICE device application SMALL NETWORK earthing system IT COMPLEMETARY CHARACTERISTICS network rated voltage 0...600 V AC 45...440 HZ DEVICE CONNECTED TO NEUTRAL type of measurement NETWORK INSULATION RESISTANCE threshold setting PRE-ALARM 2..500 KOHM response time