BENDER IRDH275-427 Ground Fault Detector

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BENDER IRDH275-427 Ground Fault Detector

The ISOMETER® of the IRDH275 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 IRDH275 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. For door 

mounting 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 coupling 

device

 •  Two separately adjustable response val

ues1 kΩ…10 MΩ

 • AMPPlus measurement method

 •  Automatic adaptation to the system 

leakage capacitance

 •  Info button to display device settings 

and 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 two  

potential-free changeover contacts 

• N/O or N/C operation, selectable 

• Backlit LC display

 • RS-485 interfac

Device version IRDH275B

 Device version IRDH275B includes the following additional functions:

 • History memory with real-time clock to store all alarm messages with date and time stamp

 •  Electrically isolated RS-485 interface (BMS protocol) for communication with other 

Bender devices

 •  Isometer disconnecting relays for the operation of several ISOMETER®s in coupled  

IT systems

 • Current output 0(4 )…20 mA (electrically isolated

Use in coupled IT systems

 Only one ISOMETER® may be active when several IT systems are coupled. Isometer dis

connecting relays and the control inputs F1/F2 integrated in version IRDH275B guarantee 

that only one ISOMETER® is active at any one time.

The structure and details of the product：

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