ATEX
3.2 Use in areas subject to an explosion hazard due to gases or dust
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001
19
Use in areas subject to an explosion hazard due to gases or dust
SIRIUS components meet a wide range of requirements for operation in hazardous areas
and for switching and protecting components used in hazardous areas.
Types of protection in accordance with ATEX Directive 2014/34/EU
3RN2 thermistor motor protection relays are suitable for overload protection of explosion-
proof motors with protection type Ex e. The relays meet the requirements of EN 60079. They
are approved under Device Group II, Category (2) for motors operated in Area "G" (areas in
which potentially explosive gas, vapor, mist, and air mixtures are present) and additionally in
Area "D" (areas containing combustible dust).
The 3RN2 thermistor motor protection relays are not intended for installation in hazardous
areas. If they are installed in a hazardous area, the 3RN2 thermistor motor protection relays
must be adapted to the applicable type of protection.
For 3RN2 thermistor motor protection relays, the EC type examination certificate is available
for Group II, Category (2) G [Ex e] [Ex d] [Ex px] and D [Ex t] [Ex p]. The number is: PTB 15
ATEX 3011
Further information and certificates are available for download on the Internet
(http://www.siemens.com/automation/service&support).
You will find further information on explosion protection (ATEX) on the Internet
(http://www.siemens.com/sirius/atex).
All ATEX-certified 3RN2 thermistor motor protection relays meet the requirements of
Category 2 (EN ISO 13849-1):
● 3RN2011
● 3RN2012-..30
● 3RN20.3
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