3SU1851-0NA00-2AA2 Siemens SIRIUS ACT Emergency-stop/off button complete device


  • 3SU1851-0NA00-2AA2
  • Mushroom-headed emergency-stop/off button
  • Complete device with contacts
  • 1 x NC
  • With rotate-to-release
  • Colour: Red
  • Mushroom diameter: 40 mm
  • Mounting diameter: 22.3 mm
  • Cable entry: 2 x M20
  • Floor mounting
  • Protection rating: IP66/IP67/IP69K
  • Material: Plastic/Metal

Availability: 104 in stock

Emergency-stop/off button complete device Siemens SIRIUS ACT 3SU1851-0NA00-2AA2


With AS‑Interface enclosures, distributed SIRIUS ACT pushbuttons and indicator lights can be quickly connected to the AS‑Interface communication system.
Using suitable components you can assemble your own enclosures with integrated AS-Interface or flexibly modify existing enclosures.

Enclosures for AS-Interface


Color of enclosure cover:

  • Gray, RAL 7035
  • Pantone yellow C, for EMERGENCY STOP

Color of enclosure base:

  • Black, RAL 9005
Equipping with AS-Interface slaves

The following slaves are available for connecting the command points:

  • Slave in A/B technology with 4 digital inputs and 3 digital outputs (4 DI/3 DQ)
  • Slave with 4 digital inputs and 4 digital outputs (4 DI/4 DQ)
  • F slave with 2 safe inputs for EMERGENCY STOP mushroom pushbutton (2 F‑DI), also with integrated red LED for the illuminated EMERGENCY STOP mushroom pushbutton.

The following table shows the maximum number of slaves possible:


One set of links is required in each case to connect a slave to contact modules, LED modules, and the connection element.

The connection elements are mounted in the front-end cable glands and are used to connect the AS‑Interface or bring unused inputs or outputs out of the enclosure.

For connection to AS-Interface, the following options are available:

  • Terminal for shaped AS‑Interface cable. The cable is contacted by the insulation piercing method and routed past the enclosure on the outside (possible only with plastic enclosure).
  • Cable gland for the shaped AS-Interface cable or round cable. The cable is routed into the enclosure (preferable for metal enclosure).
  • Connection using M12 plug.

If less than all inputs/outputs of the installed slaves in an enclosure are used for connecting the command devices, free inputs and outputs can be routed on request to the outside through an M12 socket on the top or bottom side of the enclosure.

To supply inputs with power, the S+ connection of the slave must be assigned to the socket, for outputs the OUT– connection must be assigned. Addressing is performed using the AS‑Interface connections or the integrated addressing socket. An external power supply is not required.

Enclosures with standard fittings

Enclosures with standard fittings are available with:

  • 1 to 3 command points
  • Operational voltage through AS‑Interface (approx. 30 V)
  • Vertical mounting type
  • Plastic enclosures are equipped with plastic actuators and indicators,
    and metal enclosures are equipped with metal actuators and indicators

The enclosures without EMERGENCY STOP each have one module with 4I/3O; the enclosures with EMERGENCY STOP mushroom pushbuttons have a safe AS‑Interface slave integrated in the enclosure. Enclosures with EMERGENCY STOP mushroom pushbuttons are fitted with two NC contact modules, which are wired to the safe F slave.

The contact modules and LED modules (with spring-loaded terminals) of the command devices and the AS-Interface slaves are mounted in the base of the enclosure and connected using cables. The plastic enclosures are designed with a connection for the AS‑Interface flat cable (the cable is run along the outside of the enclosure). For metal enclosures, the AS‑Interface cable is run inside the enclosure.

The enclosures with EMERGENCY STOP mushroom pushbuttons are also available with an M12 connector.

Customized enclosures (selection by configurator)

To order customized 3SU18 AS‑Interface enclosures with pushbuttons and indicator lights, use the configurator to select the elements for fitting.
An electronic order form will be generated for the options.

Configurator, see .


Enclosure for command devices, 22 mm, round, Enclosure material metal, Enclosure top part yellow, 1 control point metal, A=EMERGENCY STOP mushroom pushbutton red, 40 mm, rotate-to-unlatch, Control point in center, 1 NC, screw terminal, floor mounting, 1xM20 each on top and bottom


DataSheet in PDF

Weight 0.613 kg
Dimensions 95.00 × 101.00 × 134.00 mm


product brand name


product designation


product type designation


manufacturer's article number

● of supplied contact module

A1 = 3SU1400-2AA10-1CA0

● of supplied contact module at the command point A 1


● of the supplied holder

A = 3SU1550-0AA10-0AA0

● of the supplied holder at the command point A


● of the supplied actuator

A = 3SU1050-1HB20-0AA0

● of the supplied actuator at the command point A


● of supplied empty enclosure


design of the housing

Command point in center

shape of the enclosure front


material of the enclosure


number of command points


product component



● protective collar


color of the enclosure top part


delivery state

● as a kit


● pre-wired on strip terminal


fastening method of the enclosure


design of the actuating element

Emergency stop mushroom pushbutton

suitability for use EMERGENCY OFF switch


product feature lockout


product extension optional light source


color of the actuating element


material of the actuating element


shape of the actuating element


number of contact modules


type of unlocking device

A = rotate-to-unlatch mechanism

product component front ring


design of the front ring


material of the holder


number of LED modules


product function

● positive opening


● EMERGENCY OFF function




protection class IP

IP66, IP67, IP69(IP69K)

degree of protection NEMA rating

1, 2, 3, 3R, 4, 4X, 12, 13

shock resistance

● acc. to IEC 60068-2-27

Sinusoidal half-wave 50g / 11 ms

vibration resistance

● acc. to IEC 60068-2-6

10 … 500 Hz: 5g

reference code acc. to IEC 81346-2


continuous current of the C characteristic MCB

10 A; for a short-circuit current smaller than 400 A

operating voltage

● at AC

— at 50 Hz rated value

5 … 500 V

— at 60 Hz rated value

5 … 500 V

● at DC rated value

5 … 500 V

design of the interface for communication


design of the contact of auxiliary contacts

Silver alloy

number of NC contacts for auxiliary contacts


number of NO contacts for auxiliary contacts


type of electrical connection of modules and accessories

Screw-type terminal

type of electrical connection on enclosure

Cable routing above and below, both 1 x M20

tightening torque of the screws in the bracket

1 … 1.2 N·m

tightening torque of fixing screws in the enclosure cover

1.5 … 1.7 N·m

tightening torque with screw-type terminals

0.8 … 0.9 N·m

ambient temperature

● during operation

-25 … +70 °C

● during storage

-40 … +80 °C

environmental category during operation acc. to IEC 60721

3M6, 3S2, 3B2, 3C3, 3K6 (with relative air humidity of 10 … 95 %, no condensation in operation permitted for all devices behind front panel)

fastening method of modules and accessories

Floor mounting

shape of the installation opening


number of labels


number of inscription plates


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