EUCHNER – More than safety.
EUCHNER – More than safety.

STA4A-4141A024SEM4AS1 (Order no. 105305)

Safety switch STA ASi, plug connector M12 (open-circuit current principle)

  • Auxiliary release on the front
STA4A-4141A024SEM4AS1 (Order no. 105305)


Guard locking type


Open-circuit current principle, guard locking by control of AS-i output 0. Release by spring force.

Control of the guard locking solenoid

The guard locking solenoid is controlled by the control system via AS-Interface bus bit D0. In addition, the 24V connection can be switched safely.

AS-Interface inputs

D0, D1

Door monitoring contact SK

D2, D3

Solenoid monitoring contact ÜK

Evaluation is performed via a safety monitor.

AS-Interface outputs


LED red


LED green

LED function display

  • The Power LED indicates the operating voltage on the bus.
  • The Fault LED indicates if a fault has been detected on the AS-Interface bus.
  • The green and the red LEDs can be controlled as required by the control system via the bus using bits D1 and D2.

Auxiliary release

This is used for releasing the guard locking with the aid of a tool. To protect against tampering, the auxiliary release is sealed with sealing lacquer.

Dimension drawing
Dimension drawing
Connector assignment
Connector assignment
Electromechanical safety switches in use

Dimensional drawings

Dimensional drawings
1Auxiliary release
2Locking screw
3LED indicator

Connection examples

Connection examples
View of plug side

Technical data


EAC_RU C-DE.MO05.B.00971/20c_UL_us_E155795_2/5CCC_2020980305000541_CQC2008010305306207Asi Interface_60902_

Electrical connection values

ASI operating current max. 45 mA
ASI data in
according to AS-i Safety at Work D0, D1, D2, D3 (see positively driven contact)
ASI data out
LED green D2 (1 = LED on)
LED red D1 (1 = LED on)
Guard locking solenoid D0 (1 = Solenoid energized)
ASI auxiliary voltage
IEC 60742, PELV 24 V -15% ... +10%
ASI auxiliary current 300 mA
LED green Power (ASI voltage present)
LED red Fault (Offline phase or address 0)
ASI slave type
according to ASI specification 2.1 EA code: 7
according to ASI specification 2.1 ID code: B
ASI voltage 22.5 ... 30 ... 31.6 V
Solenoid duty cycle 100 %

Mechanical values and environment

Approach speed max. 20 m/min
Connection type
1 x Plug connector M12 (4-pin)
Number of door position positively driven contacts
according to AS-i Safety at Work 1 (D0,D1 / 1 = door closed)
Number of guard lock monitoring positively driven contacts
according to AS-i Safety at Work 1 D2,D3 (1 = locked)
Extraction force 30 N
Actuation frequency max. 1200 1/h
Actuating force 35 N
Installation orientation any
Insertion depth 24.5 mm
Mechanical life 1 x 10⁶
Retention force 20 N
Switching principle Slow-action switching contact
Degree of protection IP67
Ambient temperature -20 ... +55 °C
Contact Silver alloy, gold flashed
Housing Alloy - die-cast
Locking force Fmax 3000 N
Locking force FZh 2300 N
Guard locking principle Open-circuit current principle

Characteristic values according to EN ISO 13849-1 and EN IEC 62061

B10DMission time
Monitoring of the guard position1.15x10720 y
Important! Values valid at DC-13 100 mA/24V
Monitoring of guard locking1.15x10720 y
Important! Values valid at DC-13 100 mA/24V

In combination with actuator ACTUATOR-S-GT-SN

Overtravel 5 mm



Complete package

Download all important documents with a single click.


  • The operating instructions and any additions to the operating instructions or brief instructions
  • Any data sheets to supplement the operating instructions
  • The declaration of conformity
Download Complete Package (ZIP, 5,2 MB)

Single Documents

Other Documents

Ordering data

Ordernumber 105305
Item designation STA4A-4141A024SEM4AS1
Gross weight 0,705kg
Customs tariff number 85365019000
ECLASS 27-27-26-03 Safety switch with guard control

Technical support

Technical support
Do you have technical questions about our products, their possible use or applications? Our experts will be happy to help.

+1 315 701-0315