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Electric actuator AT 3900 (45-150 Nm)

Electric actuator for on/off or positioning of ball valves, butterfly or where a 90° rotation is needed.

Torque45 Nm to 150 Nm
Fits valves:AT3502, AT3507, AT3533S, AT3534S, AT3542, AT3547, AT3582, AT3585, AT3590, AT2282, AT 2310-2319, AT2270B


Article number Performance Control signal/Communication Torque (Nm) Power supply Amount
AT 3900-4-3A3A Electric On/Off On/Off 45 230V
AT 3900-6-3A3A Electric On/Off On/Off 60 230V
AT 3900-6-3A0A Electric On/Off On/Off 60 24VDC
AT 3900-6-3A4A Electric On/Off On/Off 60 3x400V
AT 3900-10-3A3A Electric On/Off On/Off 100 230V
AT 3900-10-9A3C Electric positioning 4-20mA, 0-10V, Profinet 100 230V
AT 3900-10-9A0A Electric On/Off On/Off 100 24VDC
AT 3900-10-9A0C Electric positioning 4-20mA, 0-10V, Profinet 100 24VDC
AT 3900-10-3A4A Electric On/Off On/Off 100 3x400V
AT 3900-10-9A4C Electric positioning 4-20mA, 0-10V, Profinet 100 3x400V
AT 3900-15-7A3A Electric On/Off On/Off 150 230V
AT 3900-15-7A3C Electric positioning 4-20mA, 0-10V, Profinet 150 230V
AT 3900-15-7A0A Electric On/Off On/Off 150 24VDC
AT 3900-15-7A0C Electric positioning 4-20mA, 0-10V, Profinet 150 24VDC
AT 3900-15-7A4A Electric On/Off On/Off 150 3x400V
AT 3900-15-7A4C Electric positioning 4-20mA, 0-10V, Profinet 150 3x400V

Product information

Range of application

Weather-proof actuator for on-off maneuvering or positioning of ball valves, butterfly or where a 90° rotation is needed. Torque 45-150 Nm.


UEC.11 Actuator for valve, electric, two-position without spring return
Actuator Bernard Electrical AT 3900 for 90°. Maneuvering of ball valves, butterfly or where a 90° rotation is needed.

Quality assurance


EC Directives 2004/108/EC, 2006 /95/EC and fulfills the EN 61000-6-4, EN 61000-6-2, EN 60034-1 and EN 60529.

IP 67 rated.

Material specification

DetailMaterialSurface treatment
1BodyAluminumEpoxy painted RAL 2010
2CoverAluminumEpoxy painted RAL 2010
3Drive shaftMassive steelUntreated

Dimension and weight

Actuator/Fig. noStandard driveABCWeight
Dimension in mm, weight in kg. *Possible to get in different sizes.

Function and design

Standard version
Reversible actuator in four sizes, for 0-90° rotation, adjustable through a combination of cams, mechanical end stop and/or torque switch.

The acutator is a compact combination of an electric motor with thermal overload protection and self-locking, permanently lubricated worm gear. Standard with manual emergency operation and position indicator.

The actuator mounting-dimensions in relation to the fittings are according to ISO 5211.

Design lifetime 20 000 cycles for on/off or 300 000 starts for positioning. Tested according to EN 15714-2 class A and B

Standard perfomance

Standard performance
Motor dutyS4-25% ED. 360 starts/h max
Temperature-20°C to +60°C
Anti condensation heaterYes
Overload protectionThermostats

Permanently lubricated gear

Cable entries2 pcs.M20x1,5 for On/Off, 3 pcs for reglulating
End position switches250V, max 16A
Terminal block8 connections

Technical data

Actuator 3900 on/off

Torque NmOperating time s/90ISO-Connection230 V AC 50 Hz Ampere400 V AC 50 Hz Ampere24 V DC
StartStopStartStopKwStartStopKwOperating time

Technical data

Actuator 3900 for positioning

Torque NmOperating time (50 Hz) sISO-connection230 V AC 50 Hz Ampere


Valve typeDp, bar
Ball valve 3 piece25DN8-40506580
Ball valve flanged16DN15-405065-80100
Butterfly valve10DN50-100125150
Butterfly valve10DN32-80100125

Accessories and options

On/off is avaliable in two different variants

1. The basic version with electromechanical circuit breaker. A feedback signal (4-20mA) is possible with accessories POT and TAM.
2. With LCD display and push buttons, this includes control with either 4-20 mA or 0-10 V.

For regulatory

  • Precision is better than 2%, adjusting the dead band with potentiometer.
  • Configurable input, 4-20 mA, 0-20 mA or 0-10 V.
  • Output signal is same as input.
  • 3 LED lights; Green (open), red (closed), yellow (torque switch or overheating enabled).
  • Mounting kit and stem extension.


During all work with the actuator, the power MUST be disconnected.
- The actuator must be connected as per the wiring diagram, see the manual.
- Each actuator must be powered by an individual switch or relay contact, minimum 16A, to prevent cross-feed between the actuators.
- At outdoor installation, the actuator should be protected by a roof or cap.
- Installation with the motor downwards should be avoided.
- Turn the valve with the control unit's hand wheel to centre position. See indication on top of the device.
- Always connect the heater.
- Check that the actuator turns the valve in the desired direction.
- The correct limit switch (open or closed) shall break the motor current.
- Cable entries must comply at least to the lowest protection class of devices.

See the manual for start-up, storage and maintenance.


Article number, manufacturer, serial number, voltage and current.
Wiring diagram is placed by the motor at delivery.

How to order

Example: 3900-4-3A3A
Fig. no.SizeOperating timeConnectionVoltageOptions
Example: 3900-4-3A3C (Positioning qith 4-20mA or 0-10V signal)
* 4, 6, 10 or 15 depending on needed torque
** 3=6 s, 7=25 s, 9=35s, seeTechnical datafor possible time
*** A=F05/07
**** 0=24 VDC, 3=230 VAC, 4=3-phase 400 VAC (Size 4 is not available as 400 VAC or 24 VDC)
***** A=On/Off, B= On/off Logic, C=Positioning D=, E=1000 ohm POT, I=TAM