The digital power measuring transducer AD-LU 325 GVD measures all quantities of the power-network (current, voltage, energy, harmonics, phase angle, active power, reactive power, apparent power) and converts these measuring values onto two freely scalable analogue outputs. The unit is therefore optimal suitable for integration in energy management systems. The current is measured via additionally available split-core current transformers. For measuring of high voltages, external transformers can be connected in series at any time. All measuring ranges and outputs can be freely parameterized. This can be carried out via the optional operating modul AD-VarioControl or via the programming software AD-Studio. The LEDs 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

  • Measurement of a phase
  • Current measurement via split-core current transformers up to 600 A
  • Measuring quantities: effective power, reactive power, apparent power, currents and voltages, frequency, power factor, harmonics (active power), energy metering
  • current and voltage output
  • Counters for active power (consuption and infeed), reactive power (inductive and capacitive) and apparent power
  • 23 mm narrow housing with detachable terminal clamp
  • Operating module AD-VarioControl as an accessory

Business data

Order number
Accessory (optional)
AD-split core current transformer 5/50/100/200/400/600 A AC
Operating module AD-VarioControl
USB programming adapter AD-VarioPass
Configuration software AD-Studio
Customs tariff number / country of origin 8543 70 90 / Deutschland


Technical specifications

Input current
Measuring ranges 0 ... 0,05 A AC from split core current transformer
Max. measurable harmonic 40
Input voltage
Measuring range 10 ... 253 V AC
Input resistance > 1 MOhm
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 20 mVss
Voltage range AC 50 ... 253 V AC, 50/60 Hz
Nominal voltage AC / DC 230 V AC / 24 V DC
Voltage range DC 20 ... 253 V DC
Power consumption AC / DC 3,4 VA / 1,8 W
Power consumption with operating module AC / DC 3,6 VA / 2,0 W
Transmission behaviour
Basic accuracy < 0,5 % (class 0.5)
Temperature influence 80 ppm/K
Response time < 0,5 s (0...90 %, 100...10 %)
Dimensions (WxHxD) 23x110x134mm
With operating module (bxhxt) 23x110x138 mm
Type of protection IP 20
Connection method Detachable terminal clamp
Terminals, wire cross section 2,5 mm² flex wire / 4 mm² one wire
Bolting torque terminals 0,5 Nm
Skinning length 6 mm
Weight ~ 145 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
1) During checking, slight signal deviations are possible.
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
Input to analog outputs / power-supply 4 kV, 50 Hz (1 min.)
Power-supply to analog out 3 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

Block and wiring diagram




Circuit examples


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