ISOMETER® IRDH275
- Insulation monitoring device for AC and DC IT systems
- Application main circuits with connected frequency converters
- According to IEC 61557-8
- Automatic adaptation to the system leakage capacitance
- Info button to display the device setting
The ISOMETER® of the IRDH275 series is designed to monitor the insulation resistance of unearthed main circuits (IT systems) AC, AC / DC 0…793 V resp. DC 0…650 V. The AMPPlus measuring principle meets the particular requirements of modern power supplies which often include rectifiers, converters, thyristor-controlled DC drives and directly connected DC components. In these systems often high leakage capacitances against earth occur due to interference suppression measures. The IRDH275 automatically adapts itself to the existing system conditions.
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. For door mounting into distribution panels, refer to type IRDH375(B).
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- Insulation monitoring for unearthed AC, AC/DC systems 0…793 V, DC 0…650 V
- Nominal voltage extendable via coupling device
- Two separately adjustable response values1 kΩ…10 MΩ
- AMPPlus measurement method
- Automatic adaptation to the system leakage capacitance
- Info button to display device settings and system leakage capacitance
- Self monitoring with automatic alarm
- Automatic self test, selectable
- Connection for external kΩ indication
- Test and reset button
- Connection external test/reset button
- Two separate alarm relays with two voltage-free changeover contacts
- N/O or N/C operation
- Backlit LC display
- RS-485 interface
- AC, DC or AC/DC main circuits
- AC/DC main circuits with directly connected DC components, such as rectifiers, converters, and thyristor-controlled DC drives
- UPS systems, battery systems
- Heaters with phase control
- Installations including switch-mode power supplies
- IT systems including high leakage capacitances
- Coupled IT systems
Optional accessories for ISOMETER® IRDH275
| Type | Art. No. |
|---|---|
| 7204-1421 | B986763 |
| 9604-1421 | B986764 |
External kΩ measuring instrument 20 mA
| Type | Art. No. |
|---|---|
| 9620-1421 | B986841 |
Coupling devices
| Type | Nominal system voltage Un | Art. No. |
|---|---|---|
| AGH150W-4 | DC 0…1760 V | B98018006 |
| AGH204S-4 | AC 0…1650 (1300) V | B914013 |
| AGH520S | AC 0…7200 V | B913033 |
Variants of ISOMETER® IRDH275
| Type | Nominal voltage Un | Supply voltage US | Art. No. |
|---|---|---|---|
| IRDH275-435 | AC 0…793 V / DC 0…650 V* | AC 88…264 / DC 77…286 V* | B91065100 |
| IRDH275-427 | AC 0…793 V / DC 0…650 V* | DC 19,2…72 V | B91065104 |
| IRDH275-425 | AC 0…793 V / DC 0…650 V* | DC 10,2…36 V | B91065108 |
| IRDH275B-435 | AC 0…793 V / DC 0…650 V* | AC 88…264 / DC 77…286 V* | B91065101 |
| IRDH275B-427 | AC 0…793 V / DC 0…650 V* | DC 19,2…72 V | B91065105 |
| IRDH275B-425 | AC 0…793 V / DC 0…650 V* | DC 10,2…36 V | B91065108 |
Downloads for ISOMETER® IRDH275
| Category | Product | Language | Date | Size | Download |
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