Siemens SIRIUS ACT 3SU1 System Manual page 26

ATEX for intrinsically safe circuits
Protection by intrinsic safety (gas atmosphere)
The LED modules (Type 3SU1401-xBBx0-xAA2) are approved in accordance with
IEC 60079-11 (Equipment protection by intrinsic safety "i") and are used in hazardous zones
1, 2. They comply with the "ib" type of protection for intrinsic safety. The use of the LED
modules is not allowed in circuits without corresponding intrinsic safety.
The LED modules may only be used in connection with a suitable 3SU1 pushbutton or
signaling device, in the suitable enclosure or a control panel. Note the corresponding zone
eligibility in accordance with Siemens Confirmation No.: 3287
Link: Siemens Confirmation No.: 3287
(https://support.industry.siemens.com/cs/document/109476838/confirmation-
manufacturer?dti=0&lc=en-WW)
Note the technical data, as well as parameters of the interfaces. You can find these in the
product datasheet.
Link: Product data sheet
(http://mall.industry.siemens.com/mall/en/WW/Catalog/Products/10221527)
26
SIRIUS ACT 3SU1 pushbuttons and signaling devices
System Manual, 08/2018, A5E03457306020A/RS-AK/010