Safety information
2.6 ATEX / IECEx
SIRIUS 3RW50 soft starter
Manual, 09/2019, A5E35628455002A/RS-AA/001
47
Certification of the 3RW50 soft starters
The motor overload protection of the 3RW50 soft starters is ATEX / IECEx-certified to SIL 1.
The 3RW50 soft starters are approved under Equipment Groups I and II, Category (2)
or (M2) in zones "G" and "D". Zones "G" and "D" are areas in which explosive gas, vapor,
mist or air mixtures and combustible dust are present:
IECEx BVS 19.0053 X [Ex]
BVS 19 ATEX F001 X
II (2)G [EX eb Gb] [EX db Gb] [EX pxb Gb]
1)
II (2)D [EX tb Db] [EX pxb Db]
I (M2) [EX db Mb]
1)
For the px applications, pressure and flow rate monitoring are additionally required for the
pressurized enclosure systems.
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.
