Technical Publication PU01200001E Reverse-feed ...

1 Effective May 2010 Technical Publication PU01200001 EReverse- feed applicationsfor circuit breakers ContentsDescription PageIntoduction.. ,. ,..5 Summary.. May 2010 Reverse-feed applicationsfor circuit breakers eaton Corporation ,.switchboard,. ,. 1 .. ,. uptime .. ,.permanent,. ,. ,. ,.. ,. , ..Similarly,.. ,. ,.. ,.. Reverse-feed .. Reverse-feed .(or. )..Figure 1. circuit breaker Fed from Multiple Power Supply Sources ,.. ,.. s. bottom .. ,.. ,. ,.. circuit breaker .1 .. (MCCBs).. (LVPCBs).. requirementsUL 489 Molded case circuit breakers, molded case switches, and circuit breaker ,.. ,. ,. :1 .. ,..1 .1 .182 .. ,..1 .1 .13 Testing ,..1 .1 .18:.Except for single-pole circuit breakers tested singly, if a circuit breaker is not marked Line and Load, one sample of each set tested, or one additional sample, shall be connected with the line and load connections reversed during the overload, endurance and interrupting ,. ,. 2,. normally.

2 ,..Figure 2. circuit breaker Connections for Reverse-feed Testing per UL 48952 NCBus #1 LoadLoadBus #2 NOUtility #1 This circuit breaker May Be Reverse-Fed Depending on Its Connection to Either of the Utility Power SourcesUtility #2NC52525252 Top Side ofCircuit BreakerLoad Connected to Top Side of circuit BreakerPowerSourceCircuitBreakerLoadBott om Side ofCircuit BreakerPower Source Connected to Bottom Side of circuit May 2010 Reverse-feed applicationsfor circuit breakers eaton Corporation .1 .1 .13:. circuit breakers shall be marked Line and Load unless the construction and test results are acceptable with the line and load connections Line . Load . ,. 3,..1 .1 ..Conversely,. Line .and. Load ..Figure 3. circuit Breakers Showing Line and Load Markings, per UL 489 General rule . :. ( ). Line .and. Load, . Line .. :.If. Line .and. Load . ,.. Line and Load MarkingsUL 1066 Low voltage AC and DC power circuit breakers used in (.)

3 50-1989). ,. ,. ,.. ( )..50-1989 .. ,.. ,. ,..Therefore,..General rule . :..Special application considerationsCircuit breakers with integral ground-fault .. ,.. :1 .. ,. 42 .. ( )3 .. ( )Figure 4. circuit breaker with Integral Ground-Fault ,..Top Side ofCircuit breaker Neutral circuit ConductorNeutral circuit Current SensorThree-Phase Current SensorsControl LogicCircuitryCircuitBreakerGround-Fault Detection MeansBottom Side of circuit BreakerElectronicTrip May 2010 Reverse-feed applications for circuit breakers eaton Corporation ,. ,.. ,. ,.. ( ). ,.. ,. ,. Line .and. Load . ( Line ). ( Load ) .Conversely,. ( ). ,.. Line .and. Load, .. Line .and. Load ..General rule . :. Line .and. Load, . Line .. :.If. Line .and. Load . ,..Molded case circuit breakers with external ground-fault/ earth leakage ,..Figure 5. Molded Case circuit Breakers with Earth Leakage ModulesEaton ( ). bottom . ,. 5 .. ,.. ,. 7 .Figure 6. Earth Leakage Module Suitable for Reverse-feed ApplicationsFigure 7.

4 Earth Leakage Modules Not Suitable for Reverse-feed Applicationsote: ). Line .and. Load, . ). Line .and. Load, .. General rule . :. Line .and. Load, . ,. Line .. :.If. Line .and. Load . ,. ,.. circuit BreakerEarth Leakage ModuleMarking Showing Do Not Reverse feed Marking Showing Where Load Must Be May 2010 Reverse-feed applicationsfor circuit breakers eaton Corporation circuit breakers with integral ground-fault and arcing-fault protectionEaton ,.. ,.. ,.. (GFCI) . (GFEP) . (AFCI) ,. ,. ,.. ,.GFCI,. ,. ,. Load .. ,. ,.. ,.. ,.. Line .terminals,. Load . normal . ,. ,. ,. 8 ..Figure 8. Miniature AFCI, GFCI, and GFEP circuit breaker Connected in Normal feed ConfigurationCircuit BreakerContacts Open Neutral circuit ConductorGround-Fault Detection Means and Control Logic CircuitryControl Power Connection for ControlLogic CircuitryCircuitBreakerNo VoltagePresentBottom Side of circuit ,.. ,. Load .terminals,. ,.GFCI,. ,. ,. ,. 9 ..Figure 9.

5 Miniature AFCI, GFCI, and GFEP circuit breaker Connected in Reverse-feed ,. ,.GFCI,.. ,.GFCI,. ,. Line .and. Load . General rule . :.. Line .and. Load, . Line .. :..If. Line .and. Load . ,.. circuit BreakerContacts OpenTop Side of circuit BreakerGround-Fault Detection Means and Control Logic CircuitryControl Power Connection for ControlLogic CircuitryCircuitBreakerVoltage StillPresentBottom Side of circuit May 2010 Reverse-feed applicationsfor circuit breakers eaton Corporation ,. ,.. Line ..and. Load, .. Line ..and. Load . WARNINGFoR All types oF eAtoN s circuit bReAkeRs, do Not coNNect the poWeR souRce to circuit breaker teRmINAls mARked loAd. ,..eaton .com .. May 2010 Reverse-feed applicationsfor circuit breakers eaton Corporation .Cleveland,. (877-386-2273)Eaton .com .. May 2010 Reverse-feed applicationsfor circuit breakers