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Comitronic-BTI AWAX28XXL 8NO+1NF CAT.4 Safety Relay


  • Reaches the highest safety level : PLe Cat.4
  • Control of switches with Acotom process
  • Control of mechanical safety switches
  • DLC electrical protection system
  • 45mm housing
  • Monitors the safety of up to 30 switches connected in series


The AWAX28XXL has been designed to monitor mechanical switches, switches using the process ACOTOM (BTI’s trademark), or the emergency push buttons with 2 NC lines at least. This module has 9 safety outputs(8 NO + 1 NC), each one with a switching capacity of AC1 8A/250V. The safety relay can be used in applications up to Kat4 PLe acc. EN ISO 13849 or Sil3 acc. EN 62061.

The safety outputs of AWAX28XXL must be tested by the user in regular test intervals unless it is cyclically tested by the application itself where it is implemented. The test interval depends typically on the safety analysis of the global system where it is implemented. It is recommended to test the system at least once a year.

Safety management on 9 outputs in a compact 45mm housing
Short-circuit detection in 2µs, self-resetting
Removable terminals

Performance level with AWAX controller : PL = e
Safety category : 4
Safety Integrity Level : SIL 3
Time before dangerous failure : MTTFd = 75 years
Cycle before dangerous failure : B10d=100,000 at 5A
Risk duration : 20ms max.
Cable severing protection : yes (opening of safety lines)
Short-circuit and overload protection : yes, using DLC (opening of safety lines and current limiting in contacts)
Reaction 2µs ultrafast
Safety contacts/diagnostics : 3x NO 8A/250V redundant / 1x NF 8A/250V redundant in serial (XXL version) or parallel (XXLP version)
Indicators : 3 LEDs for diagnostics
Reset : configurable by dip-switch (SR=Automatic, N=manual)
Mounting : symmetrical DIN 35mm rail on DIN 50022
Mounting : IP 54 electrical box
Electrical connection : Maximum 14AWG (2.08mm²) / 250V minimum
Temperature : -20°C…+60°C
Certification : TÜV Rheinland 01/205/5168/11

Additional Information

Manufacturer Comitronic - BTI
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