➱IRDH275B-425 Insulation Monitoring Device

Product description

The ISOMETER® of the IRDH275 series is designed to monitor the insulation resistance ofunearthed main circuits (IT systems) AC, AC/DC 0…793 V resp. DC 0…650 V. The AMPPlusmeasurement method meets the particular requirements of modern power supplieswhich often include rectifiers, converters, thyristor-controlled DC drives and directly connectedDC components. In these systems often high leakage capacitances against earth occurdue to interference suppression measures. The IRDH275 automatically adapts itself to theexisting system conditions.In combination with a coupling device, the devices can also be used for higher voltages.An external supply voltage allows de-energised systems to be monitored too. For doormounting into distribution panels, refer to type IRDH375(B).

Device features 

 Insulation monitoring for unearthed AC,AC/DC systems 0…793 V, DC 0…650 V

• Nominal voltage extendable via couplingdevice

• Two separately adjustable response values1 kΩ…10 MΩ

• AMPPlus measurement method

• Automatic adaptation to the systemleakage capacitance

• Info button to display device settingsand system leakage capacitance

• Self monitoring with automatic alarm

• Automatic self test, selectable

• Connection for external kΩ indication

• Test and reset button

• External test/reset button can be connected

• Two separate alarm relays with twopotential-free changeover contacts

• N/O or N/C operation, selectable

• Backlit LC display

• RS-485 interface

Discounted price will be support if you buy big quantity of  IRDH275B-425 

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