Siemens SIRIUS 3SK1 Equipment Manual page 142

Mounting
7.11 Removing 90 mm devices with device connectors from a standard mounting rail
4. Pull the device away from the device connector.
5. Separate the device connectors using a screwdriver.
6. Disassemble the terminating section.
142
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005