AD-LW 110 GS


The AD-LW 110 GS monitors the load condition of inductive loads. The main application is asynchronous motors in the 1- or 3-phase network, the load of which is greatly changed. The device makes an evaluation of the cos-phi value and an undervoltage monitoring. Exceeding the set limit values triggers a contact. The switching states are indicated on the front side by LEDs. The measuring principle for the cos-phi is based on the evaluation of the phase shift between voltage and current in one phase. The actual measured variable is therefore the phase angle between voltage and current. The setting value of the cos-phi or of the phase angle is therefore only correct for sinusoidal quantities. The phase shift is almost inverse to the load. A cos-phi of 0 (= 90 °) thus corresponds to a low load while a cos-phi of 1 (= 0 °) corresponds to a large load. An external current transformer can be connected to the current input of the device. Thanks to the integrated, efficient switching power supply, operation is possible in a wide supply voltage range.

AD-LW 110 GS


Load monitoring of asynchronous machines, e.g. Pumps and drives.

Specific characteristics

  • Connection of external current transformer possible
  • Wide range power supply
  • Limits can be set via potentiometer
  • 2 potential-free normally open contacts
  • LED display of the relay states

Business data

Order number
AD-LW 110 GS
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-lw110gs.pdf (189 kB)
Tender text zip (17 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Current input (L1)
Measuring range 0 ... 1/5 A AC (alternatively)
Permanent overload 50 %
Short-term overload 3 s 100 %
Voltage input (L1, L2, L3)
Measuring range 180 ... 253 V
Input resistance 1 MOhm
Relay outputs
Maximum switching load AC 230 V, 1 A
Maximum switching load DC 50 V, 1 A
Contact construction Closing contact
Switching operations mechanical 10000000
At 230V/1 A AC, cos(phi)=1 600000
At 230V/1 A AC, cos(phi)=0,4 200000
At 24V/1 A DC 200000
Switching hysteresis 3 % of the measuring range
Voltage range AC 50 ... 253 V AC, 50/60 Hz
Nominal voltage AC 230 V AC
Voltage range DC 20 ... 253 V DC
Nominal voltage DC 24 V DC
Power consumption AC / DC 4 VA / 2,5 W
Transmission behaviour
Basic accuracy < 2 %
Temperature influence 100 ppm/K
Response time ~ 50 ms
Dimensions (WxHxD) 23x78x103 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
Weight ~ 120 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
Galvanic isolation, test voltages
Input / relay output 4 kV, 50 Hz (1 min.)
Power supply / relay output 4 kV, 50 Hz (1 min.)
Relay 1 / relay 2 2 kV, 50 Hz (1 min.)
Protection circuits
Input Electrical surge protection
Power supply Electrical surge protection
1) During checking, slight signal deviations are possible.

Block and wiring diagram

AD-LW 110 GS


AD-LW 110 GS

CAD / CAE Daten

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