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IR427


ISOMETER® IR427

with alarm indicator and test combination MK7​

Insulation monitoring device with integrated load and temperature
monitoring for medical IT systems in accordance with IEC 60364-7-710,
IEC 61557-8 and DIN VDE 0100-710

BENDER hospital earth fault relay IR427

Product description:

The ISOMETER® of the IR427 series is designed to monitor the insulation resistance of AC circuits (medical IT systems). At the same time, the load current and temperature of the IT system transformer can be monitored.


Device features:

• Insulation monitoring for medical IT systems
• Load and temperature monitoring for IT system transformers
• Adjustable response value for insulation monitoring
• Adjustable load current response value
• Integrated voltage monitoring for four alarm and test combinations MK7
• Temperature monitoring with PTC thermistor or bimetal switch
• Connection monitoring earth
• LEDs: Power On, Alarm 1, Alarm 2
• Internal/external test button
• Configurable alarm relay: N/O or N/C operation selectable
• Self monitoring with automatic alarm
• Compact two-module enclosure (36 mm)
• Four-wire interface for four alarm indicator and test combinations MK7

Remote alarm indicator and test
combination MK7:

• Easy-to-clean front foil surface
• Label field
• Panel frame alpine white
• Alarm LEDs: Power On, insulation fault overload, overtemperature
• Test button, mute button
• Standard flush-mounting enclosure 66 mm

Application:

Medical IT systems in accordance with IEC 60364-7-710, IEC 61557-8 and DIN VDE 0100-710.

Function:

The insulation monitoring device monitors the insulation resistance, the load current and the temperature of the IT system transformer. In addition, the connections to earth, the measuring current transformer and the temperature sensor connections are monitored.
The currently measured value is indicated on the LC display. By pressing the ” “ or ” “ keys, other measured values can be displayed.
Alarms are indicated on the LC display via LEDs and an additional identification.
Parameters are assigned to the device via LCD or the function keys on the front of the device.

Insulation Monitoring:

The AMP measuring principle, also detects DC faults. When the value of the insulation resistance
falls below the set response value, the alarm relay K1 switches and the alarm LED
”AL1“ lights. When the insulation resistance exceeds the release value (response value plus
hysteresis), the alarm relay returns to its initial position and the alarm LED ”AL1“ goes out.

Load current and temperature monitoring:

The load current is monitored via the measuring current transformer STW2; the temperature
is monitored via a temperature (Bimetal) switch or a PTC Thermistor according to DIN 44081.
When the response value is exceeded, the alarm LED ”AL2“ lights. The required temperature
sensors are already incorporated in BENDER transformers.

Alarm relays:

The alarm relay switches on the occurrence of an alarm or in case of voltage failure (N/C
operation). The operating principle can be changed.

Wiring diagram:

BENDER hospital earth fault relay IR427 wiring diagram
 

Dimensions diagram:

BENDER hospital earth fault relay IR427 dimensions

Application Exapmle:

BENDER hospital earth fault relay IR427 application example

Technical data:

BENDER hospital earth fault relay IR427 technical dataBENDER hospital earth fault relay MK7 technical data

Ordering information:

BENDER hospital earth fault relay IR427 ordering information