Under-voltage and overvoltage protection relay
BENDER
The A-ISOMETER® of the IR420 series is designed to monitor the insulation resistance of 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.
