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Electric actuator AT 3942 (1000-10000 Nm)

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

Torque1000 Nm to 10000 Nm
Power supplyElectric 230V, 3x400V or 24VDC
ValvesAT3502, AT3507, AT3533S, AT3534S, AT3542, AT3547, AT3582, AT3585, AT3590, AT2282, AT 2310-2319, AT2270B


Article number Performance Control signal/Communication Torque(Nm) Power supply Operation time(s) Amount
AT 3942-XX Electric On/Off On/Off XX 230V 60
AT 3942-XX-POS Electric modulating, Electric positioning 4-20mA, 0-10v, modbus, profibus XX 230V 60
AT 3942-XX-24VDC Electric On/Off On/Off XX 24VDC 60
AT 3942-XX-POS24VDC Electric modulating, Electric positioning 4-20mA, 0-10v, modbus, profibus XX 24VDC 60
AT 3942-XX-400V Electric On/Off On/Off XX 400V 60
AT 3942-XX-POS400V Electric modulating, Electric positioning 4-20mA, 0-10v, modbus, profibus XX 400V 60

Product information

Range of Application

Weather-proof actuator for on-off or control of ball- and butterfly valves. Torque 45-150 Nm.


UEC.11 actuator for valve, electric, two-position, without spring return
Actuator Bernard Electrical AT 3942 for 90°. Maneuvering of ball-, butterfly- and plug valves.

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 68 rated.

Material Specification

DetailMaterialSurface treatment
1BodyAluminiumEpoxy painted RAL 2010
2CoverAluminiumEpoxy painted RAL 2010
3Drive shaftSteelUntreated

Function and Design

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

The acutator is a compact combination of 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 2 500 cycles for On/Off or 250 000 starts for modulating. Tested according to EN 15714-2 class A, B and C.

Standard perfomance

Standard performance
Motor dutyS4-30% ED. 12 (on/off), S4-50% ED. 12 (positioning/modulating)
Temperature-20°C to +60°C
Anti condensation heaterYes
Overload protectionThermostats

Permanently lubricated gear

Cable entries2 st.M20x1,5 for On/Off, 3 pcs for reglulating
End position switches250VAC-5A / 48VDC-2,5A
Terminal block8 connections


During all work with the actuator the power must be disconnected.
The actuator must be connected as per the wiring diagram.
Each actuator must be powered by 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, alternatively choose an actuator with protection class IP67.
Installation with motor downwards should be avoided.
Turn the valve with the control unit's hand wheel to centre position. See indication on top of 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 instructions 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

AT394110, 15, 25, 30, 50 och 80
Fig. no.Size
Exemple: 3941-5 (On/Off, 50 Nm, 230V)
* 10, 15, 25 eller 50 depending on torque 100, 150, 250, 500 eller 800 Nm
* * Option (POS= Positioner 4-20mA eller 0-10V, or for fieldbus contact Armatec)