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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 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
A.1.4
Inside-delta circuit
The inside-delta circuit requires a motor with windings that can be connected in a delta circuit
where a line voltage prevails.
SIRIUS 3RW51 Soft Starter
Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
Example circuits
A.1 Main circuit connection
169
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