MAIN CHARACTERISTICS range VIGILOHM range of product VIGILOHM product name VIGILOHM IM device short name IM9-OL product or component type INSULATION MONITORING DEVICE device application OFF-LINE MOTOR earthing system IT COMPLEMETARY CHARACTERISTICS network rated voltage 0...690 V AC 45...440 HZ PHASE TO PHASE type of measurement STATOR INSULATION RESISTANCE threshold setting PRE-ALARM 0.5..10 MOHM response time