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6.5 Safety instructions for use in hazardous areas (3RB)
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003
69
Installation and commissioning
Further documentation
To install and connect the overload relays, you require the operating instructions of the
overload relays used.
You can find a list of operating instructions and an overview of the manuals pertaining to the
SIRIUS modular system in the Appendix "References (Page 167)".
You can find further information on 3RB30 / 3RB31 electronic overload relays in Catalog
IC 10 "SIRIUS Industrial Controls" and on the Internet
(https://support.industry.siemens.com/cs/ww/en).
Setting the rated motor current
Set the 3RB2. / 3RB3. electronic overload relay to the rated motor current (according to the
type plate or design test certificate of the motor).
Trip class and tripping characteristic
Pay attention to the trip class or the tripping characteristic of the 3RB2. / 3RB3. electronic
overload relay. Choose the trip class so that the motor is thermally protected even with a
blocked rotor. The motor, cables, and contactor must be dimensioned for the selected trip
class.
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