Configuration
6.5 Safety instructions for use in hazardous areas (3RB)
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
68 Manual, 09/2016, A5E03656507420A/RS-AB/003
3RB20 / 3RB21 and 3RB30 / 3RB31 electronic 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 are not intended for
installation in hazardous areas.
When installed in hazardous areas, 3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload
relays must be adapted to the corresponding explosion protection type.
Figure 6-1 3RB20 / 3RB21
Figure 6-2 3RB30 / 3RB31
Personal injury and damage to property
All work involved in connecting, commissioning and maintenance must be carried out by
qualified, responsible personnel. Improper handling may result in serious personal injury
and considerable damage to property.
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