Atex For Intrinsically Safe Circuits - Siemens SIRIUS ACT 3SU1 System Manual

ATEX for intrinsically safe circuits

Type of protection "i" - intrinsic safety
The intrinsic safety of a circuit is achieved by safe restriction of the energy taking faults into
consideration.
● No thermal ignition (temperature rise)
● No spark ignition (closing / opening sparks).
Suitable applications are found, for example, in measuring and control engineering.
The basis for the "intrinsically safe" protection type is that a specific minimum ignition energy
is required to ignite a potentially explosive atmosphere. In an intrinsically-safe circuit, no
sparks or thermal effects occur in operation or in the event of a fault that ignite a potentially
explosive atmosphere.
Intrinsic safety is divided into various levels of protection: ia, ib and ic.
● Based on standard: IEC 60079-11, IEC 60079-0
Safety instructions
The mounting specifications from the system manual are to be observed. Only in this way
are the safety function and the conformity with the guideline for explosion protection
maintained.
Note: Requirements from standards IEC 60079-0; IEC 60079-11; IEC 60079-14; IEC 60079-
17; IEC 60079-19; IEC 60079-25
Simple electrical equipment (gas/dust atmosphere)
From our portfolio of pushbuttons and indicator lights, actuators, contact modules, empty
enclosures and special accessories have been classified according to the requirements
(IEC 60079-11: 2011, Para. 5.7 Simple apparatus) and are thus suitable for use in
intrinsically safe circuits.
Link: Siemens Confirmation No.: 3287
(https://support.industry.siemens.com/cs/document/109476838/confirmation-
manufacturer?dti=0&lc=en-WW)
SIRIUS ACT 3SU1 pushbuttons and signaling devices
System Manual, 08/2018, A5E03457306020A/RS-AK/010
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