The A-ISOMETER® of the IR1575 series is designed to monitor the insulation resistance of unearthed main circuits (IT systems) AC, AC / DC 30…480 V resp. DC 0…480 V.

The AMP measuring principle allows the Isometers to be used in systems with directly con­nected DC components. The IR1575 automatically adapts itself to the existing system leakage capacitances. An external supply voltage allows de-energized systems to be monitored too.

Please note that the frequency range of the IR1575 is limited to DC, 30…420 Hz. For use in systems containing variable-speed drives, we recommend to use the IRDH275 / 375 version.

• Insulation monitoring for unearthed sys­tems
  AC, AC / DC 0 … 480 V, DC 0 … 480 V
• Two separately adjustable response values
  2 kΩ … 1 MΩ
• AMP measuring principle
• Automatic adaptation to the system leakage capacitance
• Alarm LEDs: Alarm 1 / Alarm 2
• Fault memory behaviour, selectable
• Connection monitoring system / earth

• AC or AC / DC main circuits
• AC / DC main circuits with directly connected DC components
• UPS systems, battery systems
• Heaters with phase control
• Systems including switched-mode power supplies