IR420-D4-2 A-Isometer
Product description
The ISOMETER® IR420-D4 monitors the insulation resistance of unearthed AC control circuits (IT systems) 0...300 V. If the systems to be monitored contain DC voltage components, e.g. in switching power supplies or solenoid valves, the display and response behavior may be distorted.
The display and response values apply to pure AC voltage systems.
A separate supply voltage also enables monitoring of the de-energized system.
Main features:
- Insulation monitoring device for AC IT systems
- Control circuit application
- In accordance with DIN EN 61557-8
- Two separately adjustable response values
- Multifunctional LC display
Features and functions:
- Insulation monitoring for IT control circuits AC 0...300 V
- Two separately adjustable response values
- Reset function (automatic basic parameterization)
- System/earth connection monitoring
- Indicator LEDs for operation, alarm 1, alarm 2
- Internal/external test/reset button
- Two separate alarm relays (one changeover contact each)
- Working/quiescent current selectable
- Fault memory selectable
- Self-monitoring with automatic message
- Multifunctional LC display
- Adjustable response delay
- 2-module housing (36 mm)
- RoHS-compliant
- Spring terminal (two terminals per connection)
Technical features:
- Supply voltage Us: AC/DC 70...300V
- for unearthed AC control circuits
- AC 0 ... 300V
- Response values (Alarm 1) 1 ... 200K Ohm
- Response values (alarm 2) 1 ... 200K Ohm
- Connection monitoring system / earth
- Rated frequency 42...460Hz
- Rated voltage: AC 250V
Applications:
- AC control circuits in industry, mechanical engineering, power plants, elevators, automation, etc.
- AC control and auxiliary circuits in accordance with DIN EN 60204-1 "Electrical equipment of machines", IEC 60204-1, EN 60204-1
- AC auxiliary circuits in accordance with DIN VDE 0100-725 (VDE 0100-725)
- Smaller AC IT systems, e.g. lighting systems, mobile power generators