3. Unlock the device (top) using a screwdriver.
4. Pull the device away from the device connector.
5. Release the screws.
6. Separate the device connectors.
7. Remove the cover.
Mounting
7.15 Removing 90 mm devices with device connectors from wall
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005 153