Eaton PKE12 Manual page 51

06/10 MN03402004Z-DE/EN
• The trip block's failure rates at 60 °C ambient air
temperature and self-heating are:
– Failure rate of safe failures
163 FIT = 1.63 x 10
– Failure rate of dangerous failures
740.2 FIT = 7.402 x 10
– Failure rate of detected safe failures
35.6 FIT = 3.56 x 10
– Failure rate of dangerous but detected failures
491.6 FIT = 4.916 x 10
• For the basic device, the failure rates at an ambient air
temperature of 40 °C and of 60 °C are the same.
• The basic device's failure rates at 60 °C ambient air
temperature and self-heating are:
– Failure rate of safe failures
430.5 FIT = 4.305 x 10
– Failure rate of dangerous failures
724.5 FIT = 7.245 x 10
– Failure rate of detected safe failures
143 FIT = 1.43 x 10
– Failure rate of dangerous but detected failures
428.4 FIT = 4.284 x 10
Safety considerations
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