Feeder Assembly, Type Of Coordination 1 With Fuses - Siemens SIRIUS 3RW51 Equipment Manual

Example circuits
A.1 Main circuit connection
A.1.2

Feeder assembly, type of coordination 1 with fuses

If a main or line contactor is used, it should not be connected between the soft starter and the
motor. The soft starter could otherwise indicate a "Missing load voltage" fault in case of a start
command and delayed connection of the contactor.
Feeder assembly, type of coordination 1 with fuses
If galvanic isolation is required, install a motor contactor between the soft starter and the fuses
protector.
F1
Q12
Q21
Q11
M1
PE
168
gG full-range fuse for cable and line protection (e.g. 3NA3)
Motor contactor for electrical decoupling
External bypass contactor
3RW51 soft starter
Motor
Protective conductor
Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
SIRIUS 3RW51 Soft Starter