The A-ISOMETER® of the IRDH575 series monitors the insulation resistance of unearthed power supplies (IT systems). It is suitable for universal use in 3(N)AC, AC / DC and DC systems. AC systems may include extensive DC-supplied loads, such as converters or thyristor-controlled DC drives. The IRDH575, the insulation fault evaluators of the EDS4… series and the appro­priate measuring current transformers can be combined to an insulation fault location system.

• Universal application in 3(N)AC, AC / DC and DC IT systems
  20…575 V / 340…760 V
• Response range 1 kΩ…10 MΩ
• Info key for the indication of various para­meters and the system leakage capacitance
• Comprehensive self-monitoring function including system fault alarm relay
• Internal / external test and reset button
• Two separate alarm relays, N / C or N / O operation selectable