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What is the SIL level of XB4BS542 ?

The SIL level (SIL1/2/3) is applicable for the system as a whole and any single component cannot decide this. 

While calculating the SIL level, you can consider the below data :

The following values apply to high or continuous demand mode of operations used in machinery applications

Electromechanical components
Normal B10
mechanical durability (cycles)
%  dangerous failures
Emergency stop push-button F 22 mm XB4 & XB5 (mushroom head).
300.000
20%
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