IRDH375B-435 BENDER

The ISOMETER® of the IRDH375(B) series is designed to monitor the insulation resistance of 

unearthed main circuits (IT systems) AC, AC/DC 0…793 V resp. DC 0…650 V. The AMPPlus

measurement method meets the particular requirements of modern power supplies which 

often include rectifiers, converters, thyristor-controlled DC drives and directly connected 

DC components. In these systems often high leakage capacitances against earth occur 

due to interference suppression measures. The IRDH375(B) automatically adapts itself to 

the existing 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.

• Insulation monitoring for unearthed AC, 

AC/DC systems 0…793 V, DC 0…650 V

• Nominal voltage extendable via coupling 

device

• Two separately adjustable response values 

1 kΩ…10 MΩ 

• AMPPlus measurement method

• Automatic adaptation to the system 

leakage capacitance

• Info button to display device settings 

and the system leakage capacitance

• Continuous self monitoring, with automatic alarm message

• Automatic self test, selectable

• Connection for external kΩ indication

• Test and reset button 

• Connection external test and reset button

• Two separate alarm relays with two 

potential-free changeover contacts 

• N/O or N/C operation

• Alarm relay for system fault (N/C operation)

• Backlit LC display

• RS-485 interface

• Plug-in terminals

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