ISOMETER® IR425-D4
- Ground-fault monitoring device for AC and DC IT systems
- Application control circuits
- According to IEC 61557-8
- Two separately configurable response values
- Multi-functional LC display
The ISOMETER® of the IR425 series is designed to monitor the insulation resistance of ungrounded AC/DC control circuits (IT systems) 0…300 V. DC components existing in AC/DC systems do not influence the operating characteristics. An external supply voltage allows de-energized systems to be monitored too.
- Ground-fault monitoring device for AC and DC IT systems
- Application control circuits
- According to IEC 61557-8
- Two separately configurable response values
- Multi-functional LC display
The ISOMETER® of the IR425 series is designed to monitor the insulation resistance of ungrounded AC/DC control circuits (IT systems) 0…300 V. DC components existing in AC/DC systems do not influence the operating characteristics. An external supply voltage allows de-energized systems to be monitored too.
Features
- Insulation monitoring for AC/DC control circuits 0…300 V
- Two separately adjustable response values
- Preset function (automatic setting of basic parameters)
- Connection monitoring system/earth
- LEDs: Power On, Alarm 1, Alarm 2
- Internal/external test/reset button
- Two separate alarm relays (one changeover contact each)
- N/O or N/C operation, selectable
- Fault memory behaviour, selectable
- Self monitoring with automatic alarm
- Multi-functional LC display
- Adjustable response delay
- Two-module enclosure (36 mm)
- Push-wire terminal (two terminals per connection)
Applications
- AC/DC control circuits in the industrial sector, mechanical engineering, power plants, elevators, automation systems etc.
- AC/DC control and auxiliary circuits in accordance with DIN EN 60204-1 “Electrical equipment of machines”, IEC 60204-1, EN 60204-1
- AC/DC auxiliary circuits in accordance with DIN VDE 0100-725 (VDE 0100-725)
- Smaller AC/DC IT systems such as lighting systems
ISOMETER® IR425-D4 Variant(s)
| Type | Nominal system voltage* Un | Supply voltage* US | Response value Ran | System leakage capacitance Ce | Art. No.** |
|---|---|---|---|---|---|
| IR425-D4-1 | DC/AC 0…300 V, 15…460 Hz | DC 9,6…94 V/ AC 16…72 V, 15…460 Hz | 1…200 kΩ | < 20 µF | B71036403 B91036403 |
| IR425-D4-2 | DC/AC 0…300 V, 15…460 Hz | DC 70…300 V/ AC 70…300 V, 15…460 Hz | 1…200 kΩ | < 20 µF | B71036402 B91036402 |
* Absolute values
**(B7… = push-wire terminal / B9… = screw-type terminal)
Optional Accessories for ISOMETER® IR425-D4
| Type | Art. No. |
|---|---|
| Mounting clip for screw mounting (one piece per device) | B98060008 |
| Mounting frame XM420 | B990994 |
Downloads for ISOMETER® IR425-D4
| Name | Category | Size | Language | Timestamp | D-/B-Number |
|---|---|---|---|---|---|
| UKCA - IR42x | Declarations of Conformity | 140.6 KB | 2022/12/2020.12.2022 | ||
| IR42x | CE Declarations of Conformity | 94.2 KB | 2022/08/1212.08.2022 | ||
| IR425-D4 | Manuals | 1.9 MB | EN | 2024/08/0909.08.2024 | D00039 |
| IR425-D4 | Datasheets | 471.9 KB | EN | 2024/07/3030.07.2024 | D00039 |
| XM420 interface options | Datasheets | 223.5 KB | EN | 2019/05/1313.05.2019 | D00051 |
| Changed variants of relays from goldplated to silver-plated contacts | Technical Information | 166.3 KB | EN | 2022/06/2727.06.2022 |