Siemens SIRIUS 3RW55 Equipment Manual page 342

Example circuits
A.3 Special applications
Wiring of the 3SK1 safety relay SIL 3 with line contactor
F2
F3
Q11
Q21
Q22
S3
S4
K1
342
Fuse
Fuse
Line contactor
Contactor
Contactor
Start button
EMERGENCY STOP
3SK1111 safety relay
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006