PNOZ s4.1
Operating Manual PNOZ s4.1
21890-EN-15
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Supplementary data
CAUTION!
It is essential to consider the relay's service life graphs. The relay outputs'
safety-related characteristic data is only valid if the values in the service life
graphs are met.
The PFH value depends on the switch frequency and the load of the relay output.
If the service life graphs are not accessible, the stated PFH value can be used irrespective
of the switch frequency and the load, as the PFH value already considers the relay's B10d
value as well as the failure rates of the other components.
Service life graph
The service life graphs indicate the number of cycles from which failures due to wear must
be expected. The wear is mainly caused by the electrical load; the mechanical load is negli-
gible.
10000
1000
5000
100
500
10
50
0,1 0,5 1 2 3 4 5 6 8 10
DC-1: 24VDC-1: 24V
AC-1: 230VAC-1: 230V
AC-15: 230VAC-15: 230V
DC-13: 24VDC-13: 24V
Number of operating cycles x 1000
Switching current (A)
Fig.: Service life graphs at 24 V DC and 230 V AC
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