7.16 Mounting the sealable cover
The sealable cover (3ZY1321-1AA00 for 17.5 mm devices, 3ZY1321-2AA00 for 22.5 mm
devices) can be used to secure the DIP switches (and, if present, the potentiometers for setting
the delay time) of the safety relays against unauthorized or unintended readjustment.
As an alternative, Siemens also oers a sealable membrane (3TK2820-0AA00) for securing the
safety relays. The sealable membrane is xed to the front of the safety relay and secures the DIP
switches and the buttons (and potentiometers) against unintentional readjustment.
Mounting the sealable cover
1. Attach the hooks on the cover to the openings on the device and fold the cover up.
2. Seal the cover to secure it against unauthorized removal.
Sealing wire diameter, max.: 2 mm
Mounting
7.16 Mounting the sealable cover
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
154 Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005
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