Siemens SIRIUS 3RW50 Manual page 135

Observing standards
Increased danger in hazardous areas means it is necessary to carefully observe the
following standards:
● IEC / EN 60079-14 / VDE 0165-1: For electrical apparatus for hazardous areas.
● IEC / EN 60079-17: Inspection and maintenance of electrical installations in explosive
atmosphere.
● EN 50495: Safety devices required for the safe functioning of equipment with respect to
explosion risks.
ATEX / IECEx-specific safety data
The motor protection function according to ATEX / IECEx for 3RW50 soft starters has the
following safety data:
● Safety Integrity Level (SILCL): 1
● Hardware Fault Tolerance (HFT): 0
● Interval for testing the protective functions: 3 years
● Probability of failure on demand (PFD): 8x10-3
● Probability of a dangerous failure per hour (PFH): 5x10-7 1/h
Maintenance and repair
The 3RW50 soft starters are maintenance-free. The repair of soft starters with approval
according to IEC 61508 / EN 13849 is only permissible in the manufacturer's plant.
A repair on 3RW50 soft starters that is not performed in the manufacturer's plant results in
loss of ATEX / IECEx approval.
SIRIUS 3RW50 soft starter
Manual, 09/2019, A5E35628455002A/RS-AA/001
7.7 ATEX / IECEx-certified motor overload protection
Functions
135