Operating Instructions Chapter 3
TR4
8014467/YTD7/2016-03-30 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 65
Subject to change without notice
Product description
en
Magnetic retaining force
The safety switches of type TR4-SFxxxx are equipped with built-in
magnets. These magnets draw the actuator to the sensor with their
retaining force such that the guard (e.g. a protective door) is retained
with a certain force. This feature makes more difficult the unintentional
opening of the guard in case of disturbances such as shock and vibra-
tion and increases the availability of the machine.
3.2 Safety features
The TR4 safety switch has the following safety features:
• SIL3 according to IEC 61 508
• category 4 according to EN ISO 13 849-1
• PL e according to EN ISO 13 849-1
• type 4 according to EN ISO 14 119
– TR4 Multicoded: low level coded actuator
– TR4 Unique Coded: high level coded actuator
Operational safety
The TR4 safety switch has the following internal protective functions:
• short-circuit protection on all outputs
• overload protection on all outputs
• reverse polarity protection of the operating voltage
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