SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001
15
Safety and commissioning instructions for hazardous areas
Information and standards
Increased danger in hazardous areas means it is necessary to observe the following notes
and standards carefully:
● EN 60079-14/VDE 0165-1 for electrical apparatus for explosive gas atmospheres
● EN 60079-17 Inspection and maintenance of electrical installations in hazardous areas.
● EN 50495 Safety devices required for the safe functioning of equipment with respect to
explosion risks
The following SIRIUS 3RN2 thermistor motor protection relays with short-circuit detection are
approved for Equipment Group II, Category (2) in Area "G" (areas in which potentially
explosive gas, vapor, mist, or air mixtures are present) and are additionally approved for
Area "D" (areas containing combustible dust):
● 3RN2011
● 3RN2012-.B.30
● 3RN2013
● 3RN2023
SIRIUS 3RN2 thermistor motor protection relays are not intended for installation in
hazardous areas. If they are installed in a potentially explosive atmosphere, the SIRIUS
3RN2 thermistor motor protection relays must be adapted to the applicable type of
protection.
The machine or plant must shut down immediately if the SIRIUS 3RN2 thermistor motor
protection relay is tripped, even if connected through a frequency converter. This must be
implemented with circuitry.
SIRIUS 3RN2 thermistor motor protection relays with functional safety in accordance with
EN 50495 are suitable for protecting explosion-proof motors/machines.
On devices with a supply voltage of 24 V AC/DC, you must ensure galvanic separation with
a battery network or a power supply unit with galvanic separation (e.g. isolating transformer)
(does not apply to 3RN2013-.BA30).
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