Configuration
6.4 Protecting explosion-protected motors
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
66 Manual, 09/2016, A5E03656507420A/RS-AB/003
Protecting explosion-protected motors
SIRIUS components meet a wide range of requirements for operation in hazardous areas
and for switching and protecting components used in hazardous areas.
The thermal and electronic overload relays are certified in compliance with the European
explosion protection directive (ATEX) and the international explosion protection standard
IECEx.
Explosion protection in compliance with the European ATEX directive 2014/34/EU
3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload relays and 3RU21 thermal overload
relays are suitable for the overload protection of explosion-proof motors with protection type
"increased safety" Ex e.
The relays correspond to the requirements of EN 60079.
3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload relays and 3RU21 thermal overload
relays are approved under Device Group II, Category (2) for overload protection of motors
operated in Area "G" (areas in which potentially explosive gas, vapor, mist, and air mixes are
present) and additionally in Area "D" (areas containing combustible dust).
3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload relays and 3RU21 thermal overload
relays are not intended for installation in hazardous areas.
When installed in hazardous areas, 3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload
relays and 3RU21 thermal overload relays must be adapted to the corresponding explosion
protection type.
For 3RB30 and 3RB31 electronic overload relays in sizes S00 to S2 (size S3 on request),
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 09 ATEX 3001.
For 3RB20 / 3RB21 electronic overload relays in sizes S6 to S10 / S12, 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 06 ATEX 3001.
For 3RU21 thermal overload relays in sizes S00 to S2 (size S3 on request), the EC type test
certificate is available for Group II, Category (2) GD.
The number is DMT 98 ATEX G001.
More information and certificates for download are available on the internet
(http://www.siemens.com/automation/service&support).
More information on explosion protection (ATEX) can be found online
(http://www.siemens.com/sirius/atex).
Explosion protection according to international standard IECEx
3RU21 thermal overload relays in sizes S00 to S2 (size S3 on request) are certified
according to the international standard IECEx.
You will find certificates of explosion protection in accordance with the international standard
IECEx on the Internet (https://support.industry.siemens.com/cs/ww/en/ps/16271/cert).
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