Functions - Siemens SIRIUS 3RT Series System Manual

SIRIUS 3RA21/22 load feeders

6.4 Functions

6.4 Functions
Pre-assembled load feeders
In the 3RA2 fuseless load feeder, the 3RV2 motor starter protector takes on the dual
function of overload protection and short-circuit protection. Upstream protective devices such
as melting fuses or limiters are superfluous, as the motor starter protector is capable of
withstanding short circuits up to 150 kA at 400 V.
The 3RT2 contactor is suitable for extremely complex switching tasks requiring maximum
durability.
Tripping class CLASS 10 is a fixed setting on all pre-assembled 3RA2 feeders.
Self-assembled load feeders
● Soft start
● Star-delta (wye-delta) start
● Configuration with solid-state switching devices for high switching frequencies
In the case of a configuration with overload relay, a tripping class up to CLASS 30 can be
set. In the case of a configuration with SIMOCODE, a tripping class up to CLASS 40 can be
set.
Reference
More information ...
About the functions of motor starter protectors
570
Can be found in the chapter titled ...
SIRIUS 3RV2 motor starter protectors, under
Functions (Page 386)
System Manual, 01/2011, A8E56203870002-03
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