Notes Switch travel diagram
  Contact closed
  Contact open
  Setting range
  Break point
  Positive opening sequence/- angle
VS  adjustable range of NO contact
  adjustable range of NC contact
N   after travel
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• Actuation from bottom parallel to the switch, therefore only suitable for small housings.
• Thermoplastic enclosure
• AS-Interface M12 connector
• Wide range of alternative actuators
• Good resistance to oil and petroleum spirit
• 73,5 mm x 50,5 mm x 31 mm
• Actuator heads can be repositioned by 4 x 90°
• Mounting details to EN 50047
• AS-Interface LED and status display
• Integrated AS-Interface
• Suitable for AS-i Power24

Ordering details
Product type descriptionT4K 256 STR-AS - Ordering suffix
Article numberT4K 256 STR -AS
EAN Code

StandardsEN ISO 13849-1, IEC 61508
PLup c
Control categoryup 1
PFH1.14 x 10−6 /
- noticeup to max. 100000 switching cycles/year
SILup 1
Mission time20 Years
If a fault exclusion for hazardous damage of the 1-channel mechanics is authorized and an adequate protection against tampering is ensured, suitable for use up to:
StandardsEN ISO 13849-1, IEC 61508
PLup d
Control categoryup 3
PFH value1.01 x 10−7 /
- noticeup to max. 100000 switching cycles/year
SILup 2
Mission time20 Years
Global Properties
Permanent lightAS - 256 Winkelhebel 4K
StandardsEN 50295, EN 60947-5-1, EN ISO 13849-1, IEC 61508
Compliance with the Directives (Y/N) Yes
Suitable for safety functions (Y/N)Yes
- Material of the housingsPlastic, glass-fibre reinforced thermoplastic, self-extinguishing
- Material of the connectorPlastic
- Material of the contactsSilver
Housing coating
Housing construction formNorm construction design
Mechanical data
Design of electrical connectionconnector plug M12, 4-pole
Mechanical life1.000.000 operations
Switching frequency5000
Design of actuating elementAngle roller lever
Actuating force6
restistance to shock30 / 11
Resistance to vibration10 … 150, Amplitude 0,35 / 5
Positive break force16
Actuating speed for vertical actuation
- Max. Actuating speed1
Ambient conditions
Ambient temperature
- Min. environmental temperature−25
- Max. environmental temperature+60
- Min. Storage and transport temperature−25
- Max. Storage and transport temperature+85
Relative humidity30 … 95
- non-condensing
- non-icing
Protection classIP67 to IEC/EN 60529
Protection ratingII
Electrical data
Design of control elementOpener (NC)
Switching principleCreep circuit element
- positive break NC contact
Number of auxiliary contacts0
Number of safety contacts2
Rated impulse withstand voltage800
Rated insulation voltage32
Thermal test current10 A
Utilisation categoryAC-15: 230 V / 4 A,
DC-13: 24 V / 1 A
Max. fuse rating6 A gG D-fuse
Electrical data - AS interface
AS-i Supply voltage18 … 31.6 VDC, Protection against polarity reversal
AS-i operating current≤ 50
AS-i Device insulationinternally short-circuit proof
AS-i Specification
- versionV 3.0
- ProfileS-0.B.F.F
AS-i Inputs
- Channel 1Data bits DI 0/DI 1= dynamic code transmission
- Channel 2Data bits DI 2/DI 3= dynamic code transmission
AS-i OutputsDO 0 … DO 3 not used
AS-i Parameter bitsP1 … P3 not used
- P0Channel 2 switched
AS-i input module address0
- Default on address 0, programmable via the AS-Interface Master or Hand-held programming device
LED switching conditions display
LED switching conditions display (Y/N)Yes
AS-i LED switching conditions display
(1) yellow LEDChannel 1 / AS-i SaW Bit 0,1
(2) green/red LED (AS-i duo LED)Supply voltage / Communication error / slave address = 0
(3) yellow LEDChannel 2 / AS-i SaW Bit 2,3
Explosion protection categories for gasesNone
Explosion protected category for dustsNone
Dimensions of the sensor
- Width of sensor73.5
- Height of sensor94
- Length of sensor31
Pin assignment
1AS interface +
3AS interface −
5Functional earth connection
Switch travel diagram

Notes Switch travel diagram
  Contact closed
  Contact open
  Setting range
  Break point
  Positive opening sequence/- angle
VS  adjustable range of NO contact
  adjustable range of NC contact
N   after travel
Ordering suffix
The applicable ordering suffix is added at the end of the part number of the safety switch.
Order example: T4K 256 STR-AS-STL
...-STL connector plug M12, left

...-FKR Connection for flat cable, right

...-FKL Connection for flat cable, left

K.A. Schmersal GmbH & Co. KG, Möddinghofe 30, D-42279 Wuppertal
The data and values have been checked throroughly. Technical modifications and errors excepted.
Generiert am 22.02.2019 - 13:08:56h Kasbase 3.3.0.F.64I