Siemens SIRIUS 3SK1

Technical data
13.1 General technical data
3SK1 safety relays
196 Manual, 04/2013, A5E02526190021A/RS-AA/01
Device versions:
3SK1213-.AB40
3SK1213-.AJ20
3SK1213-.AL20
Utilization category Ue (V) Ie (A) B10
d
value
(operating cycles)
AC-1 240 10 1370000
AC-15 240 10 1370000
DC-13 24 6 1370000
PFHD and PFDavg values of the 3SK1 safety relays
The table below shows the values of the:
● Average frequency of a hazardous failure of the safety function per hour (PFH) at a high
demand rate in accordance with IEC 61508.
● Average probability of failure of the safety function upon demand (PFDavg) at a low
demand rate in accordance with IEC 61508.
Safety relay PFH [1/h]
less than
PFDavg
less than
3SK1111-.AB30 1.7 E
-09
1.0 E
-06
3SK1111-.AW20 1.5 E
-09
1.0 E
-06
3SK1112-.BB40 1.0 E
-09
7.0 E
-06
3SK1121-.AB40 2.5 E
-09
7.0 E
-06
3SK1121-.CB41 3.7 E
-09
7.0 E
-06
3SK1121-.CB42 3.7 E
-09
7.0 E
-06
3SK1121-.CB44 3.7 E
-09
7.0 E
-06
3SK1122-.AB40 1.3 E
-09
7.0 E
-06
3SK1122-.CB41 1.5 E
-09
7.0 E
-06
3SK1122-.CB42 1.5 E
-09
7.0 E
-06
3SK1122-.CB44 1.5 E
-09
7.0 E
-06
3SK1120-.AB40 1.3 E
-09
7.0 E
-06
3SK1211-.BB40 1.7 E
-09
1.0 E
-06
3SK1211-.BB00 1.7 E
-09
1.0 E
-06
3SK1211-.BW20 1.7 E
-09
1.0 E
-06
3SK1213-.AB40 1.0 E
-09
1.0 E
-06
3SK1213-.AJ20 1.0 E
-09
1.0 E
-06
3SK1213-.AL20 1.0 E
-09
1.0 E
-06
3SK1220-.AB40 1.0 E
-09
7.0 E
-06
You will find further technical data in the "Technical Data" chapters of each product and in
the "Dimension Drawings" chapter.