The digital power measuring converter AD-LU 30 GT measures all magnitudes of the three-phase network (current, voltage, energy, effective power, reactive power and apparent power..) and makes this data available via a RS485 bus. The unit is therefore optimally suitable for integration in energy management systems. 3- or 4-conductor networks can be measured. 4-wire networks can be loaded balanced or unbalanced, whereby 3-wire networks can only be measured balanced. The AD-LU 30 GT supplies itself via its measuring voltage L1. The current measuring is carried out with the bushing transformer mounted at the front. For measuring high voltages or currents, external converters can be fitted in series at any time. A Modbus-RTU protocol is run via the RS485 bus interface, whereby the AD-LU 30 GT represents a Modbus slave. The bus address is set via the rotary coding switch mounted at the front, this way several of these measuring units can be switched at one bus and can be interrogated from one central point. The AD-LU 30 GT can also be read and parameterized via the available AD-Studio. Two LEDs at the front signal the operating condition and the RS485 data traffic. The compact type of construction and the high performance ability, with simultaneous low energy consumption, allows usage in almost any application.



A typical usage is in energy management systems for balancing and determining the energy distribution.

Specific characteristics

  • current measurement through current transformer
  • power supply by measuring voltages
  • address setting via rotary coding switch
  • recording of all sizes of the three-phase system
  • parameter setting via AD-Studio

Business data

Order number
AD-LU 30 GT Digital power meter
AD-MM 400 TFT-Display
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-lu30gt.pdf (415 kB)
Tender text zip (15 kB)
STEP file step gt4a.step (6 MB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Current-inputs (I1...I3)
Measuring ranges 0 ... 1 A AC; 0 ... 5 A AC;
0 ... 20 A AC
Max. conductor diameter 4,8 mm
Voltage-inputs (L1...L3)
Measuring range 80 ... 253 V AC
Input resistance Ca. 500 kOhm
Software protocol Modbus-RTU
Data format 19200, e, 8, 1
Max. bus users 99
Bus termination 120 ohms both sides at the end
Max. length of bus 500 m (no stubs)
Cable Twisted and shielded
Voltage range AC 80 ... 253 V AC, 50/60 Hz (see voltage-inputs)
Nominal voltage AC 230 V AC
Power consumption Max. 3 VA
Transfer behavior - in reference to the current value
Basic accuracy < 0,5 % (class 0.5)
Temperature influence 80 ppm/K
Response time < 2 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
Grid side to RS485-Bus 4 kV, 50 Hz (1 min.)
Grid side to control elements 4 kV, 50 Hz (1 min.)
Protection circuits
Input Electrical surge protection
RS485-Bus Electrical surge protection
Power supply Protection against over-temperature, over-voltage and over-current
1) During checking, slight signal deviations are possible.

Block and wiring diagram




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