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

CTP-L1-AS1B-U-HA-AE-SJ-126644 (Order no. 126644)

Safety switch CTP-L1-AS – with AS-i connection, plug connector M12, with escape release (closed-circuit current principle)

  • Safety switch with guard locking and integrated evaluation electronics
  • Locking force up to 3,900 N
  • Category 4/PL e according to EN ISO 13849-1
  • Unicode
  • With escape release
  • Approach directions A, B and C (delivery state)
CTP-L1-AS1B-U-HA-AE-SJ-126644 (Order no. 126644)


Approach direction




Can be adjusted in 90° steps

Guard locking type

CTP‑L1Guard locking actuated by spring force applied and power-ON released (closed-circuit current principle)

Control of the guard locking solenoid

The guard locking solenoid can be controlled via AS-Interface bus bit D0 or via the auxiliary power.

AS-Interface inputs

D0, D1Door monitoring
D2, D3Guard lock monitoring

Evaluation is performed via a safety monitor.

AS-Interface outputs

D0Guard locking

LED function display

  • The ASI LED indicates the state of the ASi bus.
  • The STATE LED indicates the state of the switch.
  • The LOCK/DIA LED indicates if the door is locked and whether a fault has been detected in the switch.

Escape release

This is used for manual release of guard locking from the danger zone without tools.

Dimension drawing
Dimension drawing
Dimension drawing
Dimension drawing
Wiring diagram
Wiring diagram
CTP: Transponder coded safety switch CTP

Dimension drawing

Dimension drawing
1Auxiliary release
2Locking screw
4Plug connector not aligned

Dimension drawing

Dimension drawing

Wiring diagram

Wiring diagram

Technical data


Zulassung EACZulassung c_UL_us LISTED Class 2 or LV/C

Mechanical values and environment

Shock and vibration resistance In acc. with EN 60947-5-3
Housing material
Switch head cover Die-cast zinc
Safety switch housing Fiber glass reinforced thermoplastic
Net 0,42 kg
Ambient temperature -20 ... +55 °C
Degree of protection IP67/IP69/IP69K (Screwed tight plug connector/mating component)
Mechanical life 1 x 106
Installation orientation Any
Ready delay max.1 s
Switching frequency max.0,5 Hz
Connection 1 plug connector M12, 4-pin
Approach speed max.20 m/min
Guard locking principle Closed-circuit current principle
Locking force Fmax 3900 N
Locking force FZh 3000 N (Fzh = Fmax/1.3 Depending on the actuator used)
Retention force 20 N
Extraction force 20 N
Actuating force 10 N
Overtravel 5 mm

Electrical connection ratings

ASi voltage 30 V 26,5 ... 31,6 V
ASi operating current 50 mA
ASi auxiliary voltage
IEC 60742, PELV 24 V -15% ... +10%
ASi auxiliary current 400 mA
ASi slave type
According to ASI specification 3.0 ID code: B
EA code: 7
ASi data in
According to As-i Safety at Work D0 (Door position)
D1 (Door position)
D2 (Guard locking)
D3 (Guard locking)
ASi data out
Guard locking solenoid D0 (1 = Solenoid energized)
Safety class
EN IEC 61140 III

Work area

Repeat accuracy R
According to EN 60947-5-2 10 %


Additional feature Escape release actuated by pushing
For the approval acc. to UL the following applies Operation only with UL class 2 power supply, or equivalent measures see operating instructions

Reliability values according to EN ISO 13849-1

Performance Level PL e
Category 4
PFHD 4.3 x 10 -9
Mission time 20 y



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