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

CTA-L2-BR-U-HA-AP-SAB-166701 (Rend. sz. 166701)

Transponder-coded safety switch CTA-BR, 2 x M12

  • Safety switch with guard locking and integrated evaluation electronics
  • Up to 20 switches in series
  • Communication functions in combination with an IO-Link Gateway GWY-CB or ESM-CB
  • Short circuit monitoring
  • 2 safety outputs (semiconductor outputs)
  • Open-circuit current principle
  • Up to category 4 / PL e according to EN ISO 13849-1
  • With 2 plug connectors M12
  • Unicode
  • Door monitoring output
  • Approach directions A, B and C (delivery state)
CTA-L2-BR-U-HA-AP-SAB-166701 (Rend. sz. 166701)


Approach direction


Can be adjusted in 90° steps

Unicode evaluation

Each actuator is highly coded (unicode). The switch detects only taught-in actuators. Additional actuators can be taught-in. Only the last actuator taught-in is detected.

Guard locking type


Guard locking actuated by power-ON and released by spring force (open-circuit current principle).

Connector assignment

Plug connector (view of connection side)PinDesignationFunctionConnecting cable conductor coloring

X 1.1FI1BEnable input, channel BWH
X 1.2UBElectronics operating voltage, 24 V DCBN
X 1.3FO1ASafety output, channel AGN
X 1.4FO1BSafety output, channel BYE
X 1.5OL/CGuard lock monitoring output/communicationGY
X 1.6FI1AEnable input, channel APK
X 1.70VUBElectronics operating voltage, 0 V DCBU
X 1.8RSTReset inputRD
X 2.1IMMSolenoid operating voltage, 0 V DCBN
X 2.2ODDoor position monitoring outputWH
X 2.3OIDiagnostic monitoring outputBU
X 2.4IMPSolenoid operating voltage, 24 V DCBK
X 2.5-n.c.GY
Dimension drawings
Dimension drawings
Connection examples
Connection examples

Dimension drawings

Dimension drawings
1Auxiliary release
2Locking screw

Connection examples

Connection examples

Műszaki adatok



Work area

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

Electrical connection ratings

Power consumption 6 W
Current consumption
IUB 40 mA
IIMP 400 mA
external (operating voltage UB) 0.25 ... 8 A
external (solenoid operating voltage IMP) 0.5 ... 8 A
Rated insulation voltage Ui 50 V
Rated impulse withstand voltage Uimp 0.5 kV
Operating voltage DC
UUB 24 V DC -15% ... +15% reverse polarity protected, regulated, residual ripple < 5%, PELV
EMC protection requirements according to EN IEC 60947-5-3
Utilization category
DC-13 24V 150mA (Caution: Outputs must be protected with a free-wheeling diode in case of inductive loads)
Solenoid operating voltage DC
UIMP 24 V DC -15% ... +10% reverse polarity protected, regulated, residual ripple < 5%, PELV
Solenoid duty cycle 100 %
Risk time according to EN 60947-5-3
Single device max. 270 ms
Risk time according to EN 60947-5-3, extension for each additional device max. 5 ms
Switching load
according to UL 24V DC, Class 2 (alternatively, see operating instructions)
Safety class
EN IEC 61140 III
Test pulses max. 0.3 ms (Applies to a load with C <= 30 nF and R <= 20 kohm)
Test pulse interval min. ca 100 ms
Degree of contamination (external, according to EN 60947-1) 3
Monitoring output OD, OI, OL/C
Output type p-switching, short circuit-proof
Output voltage 0.8xUB ... UB V DC
Switching current 1 ... 50 mA
Safety outputs FO1A / FO1B
Output type 2 semiconductor outputs, p-switching, short circuit-proof
Discrepancy time
both safety outputs max. 10 ms according to EN IEC 60947-5-3
Output voltage
LOW U(FO1A) / U(FO1B) 0 ... 1 V DC
HIGH U(FO1A) / U(FO1B) UB-1.5 ... UB V DC
Turn-on time max. 150 ms
Switching current
per safety output FO1A / FO1B 1 ... 150 mA
Off-state current Ir max. 0.25 mA

Mechanical values and environment

Approach speed max. 20 m/min
Connection 2 plug connectors M12, 5- and 8-pin
Degree of protection IP65/IP67/IP69/IP69K (screwed tight plug connector/mating component)
Extraction force 20 N
Ready delay 5 s
Switch head cover Die-cast zinc
Safety switch housing Die-cast zinc
Actuating force 10 N
Mechanical life 1 x 10⁶
Installation orientation any
Switching frequency max. 0.5 Hz
Overtravel 5 mm
Retention force 20 N
Shock and vibration resistance according to EN IEC 60947-5-3
Ambient temperature
at UB = 24V DC -20 ... +55 °C
Locking force Fmax 8000 N
Locking force FZh 4000 N (Fzh = Fmax/2, depending on the actuator used)
Guard locking principle Open-circuit current principle

Reliability values acc. to EN ISO 13849-1

Mission time 20 y
Category 4
Performance Level PL e
PFHD 5.38 x 10 -9


Additional feature
with blind flange
Retrofit for escape release possible
The following applies to the approval according to UL Operation only with UL Class 2 power supply or equivalent measures; see operating instructions



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, 17,2 MB)

Single Documents

Other Documents

Ordering data

Rend. sz. 166701
Articlename CTA-L2-BR-U-HA-AP-SAB-166701
Weight 1,08kg
Customsclass 85365019

Műszaki támogatás

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

EUCHNER Magyarország Kft.
+36 1919 0855