ISOMETER® IR420-D4
- Ground-fault monitoring device for AC IT systems
- Application control circuits
- According to IEC 61557-8
- Two separately configurable response values
- Multi-functional LC display
The ISOMETER® IR420-D4 monitors the insulation resistance of ungrounded AC control circuits (IT systems) 0…300 V. If the systems to be monitored include DC components, such as switched-mode power supplies or solenoid valves, the display and operating characteristics may be affected.
The display and response values apply to pure AC systems. An external supply voltage allows de-energized systems to be monitored too.
- Ground-fault monitoring device for AC IT systems
- Application control circuits
- According to IEC 61557-8
- Two separately configurable response values
- Multi-functional LC display
The ISOMETER® IR420-D4 monitors the insulation resistance of ungrounded AC control circuits (IT systems) 0…300 V. If the systems to be monitored include DC components, such as switched-mode power supplies or solenoid valves, the display and operating characteristics may be affected.
The display and response values apply to pure AC systems. An external supply voltage allows de-energized systems to be monitored too.
Features
- Insulation monitoring for IT control circuits AC 0…300 V
- Two separately adjustable response values
- Preset function (automatic assignment 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 message
- Multi-functional LC display
- Adjustable response delay
- Two-module enclosure (36 mm)
- RoHS-compliant
- Push-wire terminal (two terminals per connection)
Applications
- AC control circuits in the industrial sector, mechanical engineering, power plants, elevators, automation systems etc.
- AC control and auxiliary circuits in accordance with IEC 60204-1 / DIN EN 60204-1 Electrical equipment of machines
- AC auxiliary circuits in accordance with DIN VDE 0100-725 (VDE 0100-725)
- Smaller AC IT systems such as lighting systems, mobile generators
ISOMETER® IR420-D4 Variant(s)
| Type | Nominal system voltage* Un | Supply voltage* US | Response value Ran | System leakage capacitance Ce | Art. No.** |
|---|---|---|---|---|---|
| IR420-D4-1 | AC 0…300 V, 42…460 Hz | DC 9,6…94 V / AC 16…72 V, 42…460 Hz | 1…200 kΩ | < 20 µF | B71016409 B91016409 |
| IR420-D4-2 | AC 0…300 V, 42…460 Hz | DC 70…300 V / AC 70…300 V, 42…46 Hz | 1…200 kΩ | < 20 µF | B71016405 B91016405 |
* absolute values
**(B7… = push-wire terminal / B9… = screw-type terminal)
Optional Accessories for ISOMETER® IR420-D4
| Type | Art. No. |
|---|---|
| Mounting clip for screw mounting (one piece per device) | B98060008 |
| Mounting frame XM420 | B990994 |
Downloads for ISOMETER® IR420-D4
| Name | Category | Size | Language | Timestamp | D-/B-Number |
|---|---|---|---|---|---|
| UKCA - IR42x | Declarations of Conformity | 34.0 KB | 2025/04/0101.04.2025 | ||
| IR42x | CE Declarations of Conformity | 104.4 KB | 2025/04/0101.04.2025 | ||
| IR420-D4 | Manuals | 1.7 MB | EN | 2025/06/0404.06.2025 | D00037 |
| IR420-D4 | Datasheets | 511.8 KB | EN | 2024/07/3030.07.2024 | D00037 |
| Changed variants of relays from goldplated to silver-plated contacts | Technical Information | 166.3 KB | EN | 2022/06/2727.06.2022 |
