Feeder assembly
You must provide protection for all power semiconductors against short circuits by means of
special semiconductor fuses (e.g. SITOR fuses from Siemens) to achieve coordination type 2. A
short circuit can occur, for instance, as a result of a defect in the motor windings or in the motor's
power supply cable.
4
/
/
3(
777
4
)
0
8
9
:
8
9
:
/
4
/
/
3(
777
)
0
/
00
//////
Q1 Motor starter protector
F3 aR partial-range fuse for protection of semiconductors (e.g. SITOR 3NE3/4 or 3NC3)
F3* gR full-range fuse for protection of semiconductors (e.g. SITOR 3NE1)
Q11 3RW55 or 3RW55 Failsafe soft starter
M1 Motor
PE Protective conductor
A.1.4 Inside-delta circuit
If the 3RW55 or 3RW55 Failsafe soft starter is operated in an inside-delta circuit, the motor power
output of the individual devices is increased by a factor of root 3.
Example circuits
A.1 Main circuit connection
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006 295
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