25
09/15 MN03407003Z-DE/EN
About This Manual
This manual covers the ZE/XTOM overload relays.
It describes the overload monitoring system for the protec-
tion of motors operating in potentially explosive atmo-
spheres Ex e areas.
Target group
This manual addresses qualified personnel who install,
commission and service the motor overload relays.
Abbreviations and
symbols
Symbols used in this manual have the following meanings:
X
Indicates instructions to be followed
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
P
hysikalisch
T
echnische
B
undesanstalt
German Federal Testing Laboratory: Accredited certi-
fication authority for devices operated in Ex e areas.
SIL
Safety integrity level
h
Draws your attention to interesting tips and supplemen-
tary information.
h
Caution!
Warns of the risk of material damage.
j
Danger!
Warns of the possibility of serious damage and slight
injury or death.
