Specifications

ACOutput
208V:208V480V:208V600V:208VNotransformer
Connectiontype4-wire(3PH+N+G)or3wire(3PH+G)
Outputvoltage3x208/120V
Nominaloutput
current(A)
278278278278
PowerDistribution
Modules(A)(not
included)
20A,30A,40A,50A,60A
Subfeed278Amaximum(included)seefollowingtable
PDUSubfeedCircuitbreakerTripCurrentsMerlinGerinNSJ400-
STR23SPElectronicTripUnit
1
IoSettingIrSetting
10.980.950.930.900.880.850.8
0.9288
0.8297.6
3
288281.6272256
0.7280274.4266260.4252246.4238224
0.63252247239.4234.4226.8221.8214.2201.6
0.5200196190186180176170160
1
400Aframe,100%rated@400A
2
Long-time(LT)overloadprotection=InxIoxIr-Example:400x0.5x
0.8=160A.SeeNEC-2008Art.240.6(C)foradditionalinformation.
3
Factorydefault:400x0.93x0.8=297.6Aor˜300A.Themaximum
SubfeedOutputLoadingmustnotbegreaterthan278A/phase.
RecommendedCurrentRatingofInputCircuitBreaker
208V:208V480V:208V600V:208VNotransformer
Standardrated*
Mainsinput(A)500225175450
*Standardcircuitbreakersareratedtocarry80%oftheircurrentratingcontinuously.
InrushCurrents
Thesupplyovercurrentprotectivedevicemustbeabletohandlethebelowtransformerinrushcurrents.
208V:208V480V:208V600V:208V
Inrushcurrent(A)450020001500
990–3659C-001
SymmetraPX100kW208V
5