The digital power measuring transducer AD-LU 55 GT measures all quantities of the three-phase network (current, voltage, energy, harmonics, phase angle, active power, reactive power, apparent power …) and converts these measuring values onto two freely scalable analogue outputs (20 mA / 10 V). The unit is therefore optimal suitable for integration in energy management systems. 3- or 4-wire systems can be measured. 4-wire networks can be loaded balanced or unbalanced, whereby 3-wire networks can only be measured balanced. The AD-LU 55 GT is supplied via its measuring voltage L1. The current measuring is carried out via extrenal split-core-current-transformer. For measuring of high voltages, external transformers can be connected in series at any time. The AD-LU 55 GT can be read out and parameterised via the integral interface with the aid of the available AD-Studio. An LED at the front signals the operating condition. The compact type of construction and the high performance ability with simultaneous low energy consumption allows usage in almost any application.



Typical usage in plant, machines or energy management systems for balancing and determination of energy distribution.

Specific characteristics

  • compact design
  • current measurement via split-core-current-transfomrers
  • supplied via its measuring voltage L1
  • current and voltage output
  • monitoring all variables of the three-phase network
  • parameterization via AD-Studio

Business data

Order number
AD-LU 55 GT Power measurement transducer
AD-KSW 50 Split core current transformer 50 A
AD-KSW 100 Split core current transformer 100 A
AD-KSW 200 Split core current transformer 200 A
AD-KSW 400 Split core current transformer 400 A
AD-KSW 600 Split core current transformer 600 A
Accessory (optional)
VarioPass3 USB-inetrface adapter
AD-Studio Configuration software
EClass 27210124
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-lu55gt.pdf (307 kB)
Tender text zip (17 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Current-inputs (I1...I3)
Measuring range (via split-core-transformer) 0 ... 33,3 mA AC
Input resistance Ca. 10 Ohm
Max. measurable harmonic 40
Voltage-inputs (L1...L3)
Measuring range 80 ... 253 V AC
Input resistance > 900 kOhm
Output current
Output range 0/4 ... 20 mA
Max. load 400 Ohm
Resolution 11 Bit
Residual ripple 25 µAss
Output voltage
Output range 0/2 ... 10 V
Min. load 10 kOhm
Resolution 11 Bit
Residual ripple 30 mVss
Voltage range AC 80 ... 253 V AC, 50/60 Hz (see voltage-inputs)
Nominal voltage AC 230 V AC
Power consumption Max. 3,9 VA
Transfer behavior - in reference to the current value
Basic accuracy < 0,5 % (class 0.5)
Temperature influence 80 ppm/K
Response time < 0,5 s
Dimensions (WxHxD) 71x90x70 mm
Type of protection IP 20
Connection method Screw clamp
Terminals, wire cross section 2,5 mm² flex wire / 4 mm² one wire
Bolting torque terminals 0,6 Nm
Skinning length 6 mm
Weight ~ 170 g
Manner of fastening 35 mm DIN rail 35mm
Environmental conditions
Ambient temperature -10 ... 50 °C
Storage and transport -10 ... 70 °C (no condensation)
Product family standard EN 61326-1 1)
Emitted interference EN 55011, CISPR11 Cl. B, Gr. 1
Electrical safety requirements
Product family standard EN 61010-1
Overvoltage category II
Pollution degree 2
Safety measurement EN 61010-2-030
Measurement category CAT III
Galvanic isolation, test voltages
Power supply to analog outputs 4 kV, 50 Hz (1 min.)
Power supply to relay 4 kV, 50 Hz (1 min.)
Relay to analog outputs 4 kV, 50 Hz (1 min.)
Protection circuits
Input Electrical surge protection
Power supply Protection against over-temperature, over-voltage and over-current
Analog outputs Electrical surge protection
1) During checking, slight signal deviations are possible.

Block and wiring diagram




CAD / CAE Daten

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