User Manual

DIR 1000587R0002 (L3821)
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2.1 Specications
2.1.1 General
TheLSIGunitisahigh-performanceself-poweredprotectionunitwithProtectionfunctionsfortheAB140G-N/140G-NS/140G-Rrangeof3-pole
and4-polelowvoltagecircuit-breakers.Theunit’suserinterfacealsoenablesparametersetupandfullpre-alarmandalarmmanagementwith
LEDwarning/alarmindicatorsforprotectionandwatchdogfunctions.
Dependingontheversion,theprotectionsavailableareasfollows:
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
TheLSIGcanbeinstalledon3-poleCBswithandwithoutanexternalneutral,oron4-poleCBs.
ItshouldbenotedthatthereferencecurrentforLSIGisIn(ratedcurrentdenedbyRatingPlug)andnotIu(uninterruptedratedcurrentofthe
CBitself).
Example:CB140G-N1200witha400ARatingPlughasanIuof1200AandanInof400A.
TheunitopensthecircuitbreakerinwhichitisinstalledbymeansoftheTC,whichoperatesdirectlyonthedevice’smechanicallinkage.
TheunitismadeusingadigitalmicroprocessortechnologyandinterfaceswithuserbymeansofDIPswitches.Theunit’sprotectionparameters
andgeneraloperatingmodecanbesetbyuser.
2.1.2 Electrical characteristics
Ratedoperatingfrequency 50/60Hz±10%
Passband 3000Hzmax
Peakfactor 6.3max@2In
2.1.2.1 Self-powering
Theunitrequiresnooutsidepowersourceforprotectionandalarmsignalfunctions.Itisself-poweredbycurrentsensorsinstalledoncircuit
breaker.Operationsimplydependsoncurrentdenedbelowrunningthroughatleastonephase.Anoutsidepowersourcecanbeconnected
toenableotherfunctions.
Thecharacteristicsofthebusbarcurrentaregiveninthetablebelow.
Characteristics Enabling the relay
Minimumthree-phasebusbarcurrenttoenabletherelay(Ledaliveenableandfullrelayoperation)    >80A
2.1.2.2 Auxiliary power supply
Externalauxiliarypowersupplyisprovidedusingagalvanically-separatedpowerpack.
Since auxiliary voltage needs to be isolated from the ground, “galvanically separated converters” in accordance with IEC
standard 60950 (UL 1950) or equivalent IEC 60364-41 and CEI 64-8, have to be used to guarantee a current in common mode
or leakage current (as dened in IEC 478/1 and CEI 22/3) no greater than 3.5 mA.
Presenceoftheauxiliarypowersupplyenablestherelayunittobeusedevenwithcircuitbreakeropen.
Thecharacteristicsofthepowerpackaregiveninthetablebelow.
Characteristics LSIG Version
 Auxiliaryvoltage
 (galvanicallyseparated)  24VDC±20%
 Maximumripple  5%
 Inrushcurrent@24V  ~2Afor5ms
 Ratedpower@24V   ~2W
2. LSIGRelease-Identication
TheLSIGunitsavailablewithprotectionsandoptionalmodules,areshowninthefollowinggure.
Protections
Optionalmodulesavailable
Battery unit