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

STM1A-222B024-MC2160 (Order no. 098856)

Safety switch STM

  • Actuating head made of metal
  • Auxiliary release on the front
  • 1 LED green
STM1A-222B024-MC2160 (Order no. 098856)


Approach direction

Horizontal and vertical

Can be adjusted in 90° steps

Solenoid operating voltage

  • AC/DC 24 V +10%, -15%

Guard locking type


Closed-circuit current principle, guard locking by spring force. Release by applying voltage to the guard locking solenoid.

Switching element


For monitoring the guard locking (built-in solenoid) slow-action switching contact 1 NC

Combination available:


Slow-action switching contact 2 NC

Auxiliary release

Used to unlock the guard locking with the aid of tools. The auxiliary release must be sealed to prevent tampering.

Switching function
Switching function
Dimension drawing
Dimension drawing
Wiring diagram 222
Wiring diagram 222
Electromechanical safety switches in use

Functional drawings

Functional drawings

Dimensional drawings

Dimensional drawings
1Auxiliary release
2Locking screw
3Actuator S standard
4Insertion depth

Connection examples

Connection examples

Technical data


EAC_RU C-DE.MO05.B.00971/20DGUV_STM_ET 22021_ET 22022c_UL_us_E155795_6/1CCC_2020980305000541_CQC2008010305306207

Electrical connection values

Power consumption 6 W
Connection cross section 0.34 ... 1.5 mm²
Rated insulation voltage Ui 250 V
Rated impulse withstand voltage Uimp 2.5 kV
Utilization category
AC-15 4 A 230 V
DC-13 4 A 24 V
Short circuit protection according to IEC 60269-1 4A gG
Solenoid operating voltage
AC/DC 24 V -15% ... +10%
Solenoid duty cycle 100 %
Switching voltage
min. at 10 mA 12 V
Switching current
min. at 24 V 1 mA
thermal rated current Ith 4 A

Mechanical values and environment

Approach speed max. 20 m/min
Approach direction B
Connection type
1 x M20 x 1.5
Number of door position positively driven contacts 2
Number of guard lock monitoring positively driven contacts 1
Extraction force 30 N
Actuation frequency max. 1200 1/h
Actuating force 35 N
Installation orientation any
Insertion depth 24.5 mm
Mechanical life 2 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 Reinforced thermoplastic
Locking force Fmax 2000 N
Locking force FZh 1500 N
Guard locking principle Closed-circuit current principle

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

B10DMission time
Monitoring of the guard position2x10620 y
Important! Values valid at DC-13 100 mA/24V
Monitoring of guard locking2x10620 y
Important! Values valid at DC-13 100 mA/24V

PLMaximum SILCategoryMission time
Control of guard lockingDepending on external control of guard locking20 y


C number
C2160 with 1 LED green

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, 6,5 MB)

Single Documents

Other Documents

Ordering data

Ordernumber 098856
Item designation STM1A-222B024-MC2160
Gross weight 0,491kg
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