AD-SWT 50 SO, AD-SWT 100 SO, AD-SWT 200 SO


The SWT series of devices (AD-SWT 50 SO, AD-SWT 100 SO and AD-SWT 200 SO) serves the measuring of large sinusoidal currents and simultaneous conversion to 4...20 mA transmitter signal. The devices are designed in two-wire technology and can be operated in a wide range of voltages. Dependent on the amount of the primary current, the devices sink a proportional 4...20 mA signal from the connected supply voltage. Due to the integral protection against polarization error and over-voltage, the transmitter are also protected against erroneous applications or transient over-voltages. The housing is designed in external clamp-on transformer format and therefore can be easily integrated into existing units.

AD-SWT 50 SO, AD-SWT 100 SO, AD-SWT 200 SO


Measurings of large sinusoidal alternating currents, which, for instance, correspond to motor currents, pump currents or generator currents.

Attention: when fitting, it must be ensured that the ferrite surfaces of the SWT are free from dirt or fat residues through contact. Otherwise measuring value deviations or even error measurings are possible.

Specific characteristics

  • Clamp-on transformer technology
  • Extended supply voltage range
  • 4 ... 20 mA transmitter signal
  • Easy installation

Business data

Order number
AD-SWT 50 SO 50 A AC Primärstrom
AD-SWT 100 SO 100 A AC Primärstrom
AD-SWT 200 SO 200 A AC Primärstrom
DIN rail holder 35 mm DIN rail
Customs tariff number / country of origin 8504 31 29 / Deutschland


Data sheet pdf en-swt.pdf (133 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Primary current
Measurement method Inductive
Measuring range 0 ... 50/100/200 A AC
Max. conductor diameter 23 mm
Transmitter output
Output range 4 ... 20 mA
Residual ripple 50 µAss
Voltage range DC 10 ... 30 V DC
Nominal voltage DC 24 V DC
Transmission behaviour
Basic accuracy < 1 %
Temperature influence 100 ppm/K
Response time < 2 s (10...90 %)
Dimensions (WxHxD) 50x42x82 mm
Type of protection IP 20
Connection method Screw clamp
Terminals, wire cross section 1,5 mm² flex wire / 2,5 mm² one wire
Bolting torque terminals 0,5 Nm
Weight ~ 200 g
Manner of fastening Folding transducer housing
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 61010-2-030
Measurement category CAT III
Galvanic isolation, test voltages
Input / output 4 kV, 50 Hz (1 min.)
Protection circuits
Output Electrical surge and reverse current protection
1) During checking, slight signal deviations are possible.

Block and wiring diagram

AD-SWT 50 SO, AD-SWT 100 SO, AD-SWT 200 SO


AD-SWT 50 SO, AD-SWT 100 SO, AD-SWT 200 SO

CAD / CAE Daten

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