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What is the difference between XB4BS8442 & XB4BS542L ?

There is slight difference indicated in the datasheet related to the operator mechanism, It has been highlighted in the attached datasheets of both products that are available on website,

XB4BS8442: trigger action and mechanical latching operator
XB4BS542L mechanical latching operator

Kindly find the below extra clarifications:
XB4BS8442: mushroom pushbutton equipped by 1 N/C contact.
This operator is emergency stop trigger action and mechanical latching pushbutton conforming to standard EN/ISO 13850 - Safety of machinery Emergency stop and to Machinery Directive 2006/42/EC.

XB4BS542: mushroom pushbutton equipped by 1 N/C contact.
This operator is emergency switching off with mechanical latching pushbuttons conforming to standard IEC 60364-5-53 Electrical installations of buildings.
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