BENDER AGH675S-7

The coupling devices of the AGH675S-7/AGH675S-7MV15 series are used to extend the 

nominal voltage range of the ISOMETER® IRDH275BM-7 illustrated in the wiring diagram. 

The ISOMETER® IRDH275BM-7 together with the coupling device AGH675S-7 monitors 

the insulation resistance of IT medium voltage systems up to 7,2 kV. 

The ISOMETER® IRDH275BM-7 together with two coupling devices AGH675S-7MV15 monitors 

the insulation resistance of IT systems up to 15,5 kV. Always two AGH675S-7MV15 together 

with one IRDH275BM-7 are required. 

Terminal 5 of the coupling device AGH675S-7 has to be connected to terminal AK of the 

IRDH275BM-7. 

If two AGH675S-7MV15 are connected to the IRDH275BM-7, the terminals 5 have to be 

connected in parallel to terminal AK of the IRDH275BM-7.

Insulation coordination acc. to DIN EN 61800-5-1 

AGH675S-7 

Rated insulation voltage AC 7.2 kV 

AGH675S-7MV15 

Rated insulation voltage AC 15.5 kV 

Voltage test according to IEC 61800-5-1 

Type test: 

AGH675S-7 

AC voltage test (basic insulation) 40 kV 

AC voltage test (basic insulation) 20 kV 

Partial discharge test 14 kV 

AGH675S-7MV15 

Impulse voltage test (basic insulation) 111 kV 

AC voltage test (basic insulation) 70 kV 

Partial discharge test 29 kV 

Routine test: 

AC voltage test 40 kV 

Voltage ranges 

AGH675S-7 

Nominal system voltage Un AC, 3(N)AC, DC 0…7.2 kV 

Nominal frequency fn 0…460 Hz 

Internal DC resistance Ri ≥ 2.39 MΩ

AGH675S-7MV15 

Nominal system voltage Un AC, 3(N)AC, DC 0…15.5 kV 

Nominal frequency fn 0…460 Hz 

Internal DC resistance Ri ≥ 4.7 MΩ

Environment/EMC 

Operating temperature (normal operation) - 10…+ 60 °C 

Operating temperature (continuous operation with asymmetrical earth fault) - 10…+ 55 °C 

Classification of climatic conditions acc. to IEC 60721:

Stationary use (IEC 60721-3-3) 3K5 (except condensation and formation of ice)

Transport (IEC 60721-3-2) 2K3

Long-term storage (IEC 60721-3-1) 1K4 

Classification of mechanical conditions acc. to IEC 60721:

Stationary use (IEC 60721-3-3) 3M4 (3M7 Y axis)

Transport (IEC 60721-3-2) 2M2

Long-term storage (IEC 60721-3-1) 1M3 

Connection 

Connection terminal 2 (medium voltage) high-voltage cable (encapsulated on the device side) 

Connection, flexible with ring eyelet M4 

Connection type terminals 3, 4, 5 screw-type terminals 

Connection

rigid/flexible 0.2…4 mm²/0.2…2.5 mm²

flexible connector sleeve 0.25…2.5 mm² 

Other 

Operating mode continuous operation 

Mounting any position 

Degree of protection, internal components (DIN EN 60529) IP 64 

Degree of protection, terminals (DIN EN 60529) IP 20 

Type of enclosure resin-encapsulated block 

Screw mounting M5 

Flammability class UL94 HB 

Documentation number D00095 

Weight ≤ 5100 g

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