AD-LU 655 GT


The AD-LU 655 GT is a digital measuring transducer for the acquisition of all measured variables in the three-phase network. Currents are detected via external folding current transformers. In addition to the fundamental oscillations, the harmonics up to the 32nd harmonic are also measured for currents and voltages. In addition to the three phase currents, the current in the neutral conductor can also be measured. Any measured variable can be assigned to each analog output. Each digital output can be assigned its own function such as limit value monitoring or pulse output for an energy meter. All measured data can be read out via the Modbus-RTU interface. With an optional display device such as the AD-MM 400 FE or the AD-MM 500 FE, the data can be displayed and the device can be configured if necessary.

AD-LU 655 GT


Transducer for a maximum of any 4 three-phase current quantities. Limiting value indicator for monitoring of a maximum of 2 three-phase current quantities. Registration of all relevant measuring quantities of the three-phase current network and supply of the measuring quantities via a modbus interface.

Business data

Order number
AD-LU 655 GT Messumformer, externe Klappstromwandler
USB programming adapter VarioPass
EClass 27210124
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-lu655gt.pdf (319 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Voltage inputs L1, L2, L3 against N
Nominal voltage 230 V AC
Maximum voltage 300 V AC
Input resistance 1 MOhm
Peak load 600 V AC, 1s
Current inputs
Number 4 (L1, L2, L3 und N)
Rated current range 0 ... 33,3 mA AC
Current measurement Externe Klappstromwandler
Input resistance ~10 Ohm
Analog outputs
Number 4
Type Current or voltage, software configurable
Current outputs
Maximum output range -21 ... 21 mA
Max. burden 400 Ohm
Max. residual ripple 40 µAss
Voltage outputs
Maximum output range -10,5 ... 10,5 V
Min. burden 10 kOhm
Max. residual ripple 20 mVss
Digital outputs
Number 3
Type Optisch, MOS-Relais
Maximum switching voltage 60 V AC/DC
Maximum switching current 550 mA AC/DC
Accuracy class 0,5%
Temperature influence < 200 ppm/K
Frequency influence ~0,2 %, 40 ... 60 Hz
Influence of phase angle ~0,2 %, 40 ... 60 Hz
Response time ~500 ms, 10 ... 90 %
Communication interface
Physical RS-485
Parameter 19200, 8, 1 , even
Protocol Modbus RTU
DC 21 ... 253 V DC, 3,5 W
AC 50 ... 253 V AC, 6 VA
Type of protection IP 20
Connection method Screw clamp
Cross section fine wire 2,5 mm2
Cross section one wire 4 mm2
Mounting DIN rail mounting
Weight ~400 g
Environmental conditions
Operating temperature -10 ... 50 °C
Storage, transport -25 ... 80 °C
Electromagnetic compatibility
Product family standard EN 61326-1
Emission EN 55011, CISPR11 Cl. B, Gr. 1
During an interference effect slight signal deviations are possible.
Electrical safety requirements
Product family standard EN 60688
Overvoltage category III
Pollution degree 2
Isolation-voltage 500 V AC
Test voltage input/output 5 kV RMS, 1 Min.
Test voltage output/supply 4 kV RMS, 1 Min.
Test voltage input/supply 5 kV RMS, 1 Min.

Block and wiring diagram

AD-LU 655 GT


AD-LU 655 GT

CAD / CAE Daten

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