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10/15 MN03402004Z-DE/EN
Safety analysis
The following functional safety characteristic values were
determined for the PKE12, PKE32, and PKE65 motor-protec-
tive circuit-breakers by TÜV Rheinland Inter Traffic GmbH's
TSC (Transport Safety Consult) unit:
For operation as high-demand systems (> 1/year) with archi-
tecture 1oo1, consisting of subsystems of type A with a hard-
ware fault tolerance (HFT) of 0 (see EN 61508 Part 1,
Table 3 and EN 61508 Part 2, Table 2) for PKE12, PKE32,
and PKE65 motor-protective circuit-breakers at an ambient
temperature of 40 °C (component temperature of 90 °C):
• Motor protection (overload)
– Safety integrity level
SIL 2
– Safe Failure Fraction (SFF)
73 %
– Failure rate for undetected safe failures
-7
4.115 x 10
/h
– Failure rate for detected safe failures
1.82 x 10-7/h
– Failure rate for undetected dangerous failures
5.731 x 10-7/h
– Failure rate for detected dangerous failures
9.414 x 10-7/h
– Diagnostic coverage (DC)
70 %
Safety analysis
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