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10/06 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).
List of revisions
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.
Edition Page Description New Modification Omitted
10/06 33 „Rating plates“ j
CLASS Tripping class of a thermal overload circuit-
breaker
EEx e
"Increased safety“ degree of protection
RTT
Rated threshold temperature
PTB
Physikalisch Technische Bundesanstalt.
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
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