User Manual

DIR 1000587R0002 (L3821)
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3.1 Specications
3.1.1 General
The LSIG-MMarehigh-performanceself-poweredprotectionunitswith Protection, Measurement, Data storage, Communication (optional)
Self-test and Load control functionsfor140G-Nand140G-NSrangeof3-and4-polelow-voltageaircircuitbreakers.Theunit’suserinterface
alsoenablesparametersetupandfullprealarmandalarmmanagementforprotectionandwatchdogfunctions.
Basicprotectionsavailableare:
Symbol Protection against
L overloadwithinverselongtimedelay
S  short-circuitwithadjustabledelay
I instantaneousshort-circuit
G earthfaultwithadjustabledelay
U  phasecurrentunbalance
OT temperatureoff-range
MM maintenancemodule
TheLSIG-MMcanbeinstalledon3-poleCBswithandwithoutanexternalneutral,oron4-poleCBs.
NotethatreferencecurrentisIn(ratedcurrentdenedbythefrontRatingPlug)andnotIu(uninterruptedratedcurrentoftheCBitself).
Example:140G-N1200witha400ARatingPlughasanIuof1200AandanInof400A.
TheunitopensthecircuitbreakerinwhichitisinstalledbymeansoftheTC,whichtakeseffectdirectlyonthedevice’smechanicallinkage.
Theprotectionunitisself-poweredbycurrentsensors.
Theunitismadeusingdigitalmicroprocessortechnologyandinterfaceswiththeuserbymeansofagraphicdisplayandkeyboard.
3.1.2 Electrical characteristics
Ratedoperatingfrequency 50/60Hz±10%
Passband 3000Hzmax
Peakfactor 6.3max@2In
3.1.2.1 Self-powering
Self-poweringenablesprotectionunittobepoweredwithbusbarcurrentusingcurrenttransformers.
Usingthispoweringmode,unit’sprotectionfunctionsareensured,however,nottheaccessoryfunctionsregardingthemodules.Thecharacte-
risticsaregiveninthetablebelow:
General characteristics relay enabling display switch-on
Minimum3-phasebusbarcurrenttoenabletherelayandswitchonthedisplay >80A  >160A
3  LSIG-MMRelease-Identication
TheLSIG-MMunitsavailable,withvariousprotections,areillustratedinthefollowinggure.
Protections
Forallversions"U""OT"
Optionalmoduleavailable
Communication module
LSIG-MM