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

CTP-L2-AS1B-U-HA-AZ-SJ-124988 (Order no. 124988)

Safety switch CTP-L2-AS – with AS-i connection, plug connector M12 (open-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
  • Approach directions A, B and C (delivery state)
CTP-L2-AS1B-U-HA-AZ-SJ-124988 (Order no. 124988)


Approach direction




Can be adjusted in 90° steps

Guard locking type

CTP‑L2Guard locking actuated by power-ON applied and spring released (open-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.
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

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 Open-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 %


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