The digital power converter AD-LU 40 GT measures all values of the three-phase power grid such as current, voltage, energy, active, reactive, apparent power and frequency and makes this data available via a fieldbus. The device is therefore ideally suited for integration into energy management systems. The ProfiNet variant contains a 2-port switch for direct forwarding to the next device. 3- or 4-wire networks can be measured. 4-wire networks may have balanced or unbalanced load. 3-wire networks must have balanced load. The AD-LU 40 GT is powered by its measuring voltage L1. However, a variant with separate supply terminals and wide-range power supply is also available (AD-LU 40-S GT). The current measurement takes place via the throughput converters attached to the front. For the measurement of higher voltages or currents, external converters can be connected at any time. LEDs on the front panel signal the operating state and the data traffic. The compact design and the high performance combined with low energy consumption allow it to be used in almost any application. In addition, the device has a front-sided RS485 interface to which, for example, the TFT display AD-MM 400 can be connected. Thus, without any great effort, all measured values can be displayed.

AD-LU 40 GT,  AD-LU 40S GT


Measurement and monitoring of all electrical characteristics in electrical systems. Detection of load profiles for energy management systems, e.g. ISO 50001. Recording the energy consumption of individual consumers. Monitoring of voltage quality variables, e.g. Harmonics.
Attention: This is a Class A product according to EN 55011. Additional EMC actions may be necessary when used in small businesses or in residential areas.

Specific characteristics

  • Connection of 4-wire systems of any load
  • Measurement of currents, voltages, power, power factors, frequency, harmonics
  • Low power loss during current measurement thanks to integrated through-current transformers
  • Counters for applied and feedback energies
  • Counters for inductive and capacitive reactive power
  • Fieldbus interface for PROFINET or PROFIBUS
  • RS485 interface for connecting a TFT display

Business data

Order number
AD-LU 40S GT-PN PROFINET, with separate supply terminals
AD-LU 40S GT-PB PROFIBUS, with separate supply terminals
AD-MM 400 TFT display for front panel installation
EClass 27210124
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-lu40gt.pdf (447 kB)
Tender text zip (5 kB)
Tender text zip (15 kB)
STEP file zip (543 kB)
Grundlagenwissen Leistungs- und Energiemesstechnik pdf lu-grundbegriffe.pdf
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
Max. measurable harmonic 40
Voltage-inputs (L1...L3)
Measuring range 80 ... 253 V AC (AD-LU 40 GT)
0 ... 253 V AC (AD-LU 40S GT)
Input resistance Ca. 970 kOhm
Ethernet 2 Port Switch
Protocol specification PROFINET IO
Default IP-address
Address setting BCD-switches 00 ... 99
Bus termination 120 ohms both sides at the end
Max. length of bus 500 m (no stubs)
Cable Twisted and shielded
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 spur lines)
Cable Twisted and shielded
Address setting BCD-switches 00...99
Voltage range AC 80 ... 253 V AC, 50/60 Hz (see voltage-inputs)
Nominal voltage AC 230 V AC
Power consumption Max. 4 VA
Supply (-S)
Voltage range AC 50 ... 253 V AC, 50/60 Hz
Voltage range DC 20 ... 253 V DC
Nominal voltage AC/DC 230 V AC / 24 V DC
Input power AC/DC Max. 4 VA / 3 W
Basic accuracy <= 0,5 % (class 0.5)
Temperature influence 80 ppm/K
Sampling interval 200 ms
Dimensions (WxHxD) 105x90x83 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
Weight Ca. 210 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. A, 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
Grid side zu bus 4 kV, 50 Hz (1 min.)
Grid side to control elements 4 kV, 50 Hz (1 min.)

Block and wiring diagram

AD-LU 40 GT,  AD-LU 40S GT


AD-LU 40 GT,  AD-LU 40S GT

Circuit examples

AD-LU 40 GT,  AD-LU 40S GT

We only use technically necessary cookies to improve the user-friendliness of our site.
Cookies for analysis and marketing purposes are not used!
You can find further information in our privacy policy.
made with ♡ by