Siemens SIRIUS 3SK1

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4.3.15 Use of magnetically operated switches
If magnetically operated switches are used, the magnetic contacts may weld on account of
capacitive e󹪜ects. The reason for this is that a high peak current may occur when switching these
loads (e.g. also cable capacitances). A corresponding fuse protection with the rated current of
the magnetically operated switch must be provided if the device/sensor combinations have not
been explicitly enabled.
For more details, please refer to the documentation of the magnetically operated switch.
Safety systems - General information
4.3 Basic terminology
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
52 Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005