Abbreviations And Symbols - Eaton ZE serie Handbuch

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0.3 Abbreviations and symbols

0.3 Abbreviations and symbols
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Symbols used in this manual have the following meanings:
Ex e Type of protection "Increased Safety"
HFT Hardware-Fault-Tolerance
HM Highest possible set current
NM Lowest possible setting current
PL Performance Level
PTB Physikalisch Technische Bundesanstalt
= German Federal Testing Laboratory: Accredited certification authority for devices
operated in Ex e areas.
SIL Safety integrity level
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