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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 additional protection for all
power semiconductors against short circuits by means of special semiconductor fuses (e.g.
SIEMENS SITOR). 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
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
3RW51 soft starter
Q21
External bypass contactor
M1
Motor
PE
Protective conductor
3RW51 Soft Starter
Manual, 06/2019, A5E37108631002A/RS-AB/002
Example circuits
A.1 Main circuit connection
151
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