AEG ME09 Installation, Operation And Maintenance Manual page 35

2.0
DANGER
Mpro
2.1
GF
HSIO
C
ST GF
I
I²t
Ie
Ig
Ii
In
LT
Ir
Ist ST
LT
LTDB LT
MCR
RELT
ST
ST
STDB
x CT
x Ie
x In
LT
x LT
OFF
Ie
TRIP UNIT
2.0 Trip unit
GENERAL INFORMATION
Please ensure that the breaker is placed in tripped
posi on, that the opera on indicator shows OFF and that
the mechanisms springs are fully discharged.
The Mpro Trip Unit is an electronic device that interfaces with a
circuit breaker. It monitorsthe breaker phase currents, neutral
current and/or voltage and trips the breaker in the event of an
over-current or voltage related condi on.
It also can provide protec ve relay func ons, advanced metering,
diagnos c features, and communica ons. The Trip Unit can be
removed or replaced in the eld by de-energizing and removing the
cover of the circuit breaker.
The Trip Unit also connects with the circuit breaker ux shi er to
provide the electromechanical tripping func on.
A user interface is provided on the front panel to allow adjustment of
the Trip Unit's parameters.
ABBREVIATIONS AND ACRONYMS
The abbrevia ons and acronyms in Table 2.1
used throughout this manual.
Table 2.1
Denomina on / Descrip on
GF Groundfault
HSIO Hi set Instantaneous protec on
I Instantaneous Short circuit Current se ng
I²t 'Slope' se ng on ST or GF device
Ie Primary Current se ng
Ground, or Earth fault Current se ng
Ig
Instantaneous Short circuit Current se ng
Ii
Current ra ng of Breaker
In
LT or overload Current se ng
Ir
ST or Timed Short circuit Current se ng
Ist
Long Time or Overload protec on
LT
LT or overload me delay band
LTDB
Making Current Release
MCR
Reduced Instantaneous
RELT
ST Short Time or Timed Short circuit Current se ng
STDB STDB ST or short circuit me delay band
Mul ple of installed sensor ra ng
x CT
x Ie x Ie Mul ple of Primary Breaker se ng Ie
x In x In Mul ple of Breaker Current ra ng
x LT x LT Mul ple of LT or overload Current se ng
2.
0
2.0-02