Configuration
6.5 Application environment
SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
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Manual, 09/2014, A5E03656507420A/RS-AA/002
Ambient temperatures for 3RB30/3RB31 overload relays
3RB30/3RB31 solid-state overload relays compensate temperature in the temperature range
from –25 °C to +60 °C in accordance with IEC/EN 60947-4-1.
The reduction factors which have to be taken into account when using solid-state overload
relays at an ambient temperature higher than 60°C can be obtained on request from our
Technical Assistance on the Internet (
http://www.siemens.com/automation/service&support
Current derating during heavy-duty starting for 3RB30/3RB31 overload relays
No reduction in the maximum permissible rated operating current is required for size S00 (to
16 A).
The following maximum rated operating currents are permissible for device versions with the
setting range 10 to 40 A for size S0:
Table 6- 7
Derating during heavy-duty starting, 3RB30/3RB31 overload relays (size S0)
Trip class
Rated operating current
CLASS 20E
I
e max
= 32 A
CLASS 30E
I
e max
= 25 A
The following maximum rated operating currents are permissible for device versions with the
setting range 20 to 80 A for size S2:
Table 6- 8
Derating during heavy-duty starting, 3RB30/3RB31 overload relays (size S2)
Trip class
Rated operating current
CLASS 5E
CLASS 10E
I
e max
= 80 A
CLASS 20E
I
e max
= 60 A
CLASS 30E
I
e max
= 50 A
Special application environments
SIRIUS components have been approved by a whole range of bodies for various sectors
(shipbuilding, etc.). The current list of approvals is provided in Chapter 16 of the SIRIUS
IC 10 catalog. You can find more information and an option to download certificates on the
internet (
