The ISOMETER® of the IR470LY series is designed to monitor the insulation resistance of unearthed AC and three-phase systems (IT systems) AC/3(N)AC 0…793 V. In combination with a coupling device, the Isometers can also be used for higher voltages. An external supply voltage allows de-energized systems to be monitored too.

The systems to be monitored should not contain DC components. Due to the measuring principle, insulation faults downstream of directly connected rectifiers are indicated with increased response sensitivity. The set response values apply to the pure AC system only.

• Insulation monitoring for AC, 3(N)AC systems 0…793 V (IT systems)
• Nominal voltage extendable via coupling device
• Response values, adjustable 1…200 kΩ
• Connection monitoring system/earth
• Power ON LED, Alarm LED for signalling AC, L+, L- insulation faults
• LED bar graph indicator for signalling AC, L+, L- insulation faults

• Connection for external kΩ indication
• Combined test and reset button
• Connection external test/reset button
• Alarm relay with two potential-free changeover contacts
• Selectable N/O or N/C operation
• Fault memory behaviour, selectable

參數 ISOMETER® IR470LY