A.1.3 Feeder Assembly, Type Of Coordination 2 - Siemens SIRIUS 3RW55 Manual

A.1.3 Feeder assembly, type of coordination 2
Feeder assembly, type of coordination 2
In order to achieve type of coordination 2, you must provide protection for all thyristors
against short circuits by means of special semiconductor fuses (e.g. SITOR fuses from
Siemens). 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.
Q1
F3
F3*
Q11
M1
PE
SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002
Motor starter protector
aR partial-range fuse for protection of semiconductors (e.g. SITOR 3NE3/4 or 3NC3)
gR full-range fuse for protection of semiconductors (e.g. SITOR 3NE1)
Soft starter
Motor
Protective conductor
Example circuits
A.1 Main circuit connection
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