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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
150
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
Manual, 06/2019, A5E37108631002A/RS-AB/002
3RW51 Soft Starter
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