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3
11/01 AWB2300-1433GB
About this manual
This manual applies to the motor-protective system ZEV.
It describes the overload monitoring system for the
protection of motors operating in potentially explosive
atmospheres (EEx e areas).
Target group
This manual addresses skilled personnel who install,
commission and service the motor-protective systems.
Abbreviations and
symbols
The abbreviations and symbols used in this manual have the
following meaning:
X
indicates actions to be taken.
CLASS
Tripping class of a thermal overload circuit-
breaker
EEx e
"Increased safety“ degree of protection
RTT
Rated threshold temperature
PTB
P
hysikalisch
T
echnische
B
undesanstalt.
German Federal Testing Laboratory: Accredited
certification authority for devices operated in
EEx e areas.
PTC
A PTC resistor is a temperature sensor with
positive temperature coefficient
h
h
h
h
Draws your attention to interesting tips and
supplementary information
Note
Warns of the risk of slight material damage.