10 'Circuit breakers and Fuses' QUESTIONS
AND ANSWERS 2025
EveryAcircuitAbreakerAmustAhaveAitsAinterruptingAratingAshownAonAtheAcircuitAbreaker,A
unlessAitsAratedAforA____.A-ACORRECTAANSWERS-5,000A
WhenAaAcommonAmolded-
caseAcircuitAbreakerAtrips,AinAwhatApositionAwillAtheAoperatingAhandleAbe?A-
ACORRECTAANSWERS-HalfwayAbetweenAtheAONAandAOFFApositions
WhatAisAtheAhighestAvoltageAratingAforAcircuitAbreakersAusedAonADCAsystemsAthatAULAreco
gnizes?A-ACORRECTAANSWERS-600V
WhereAisAtheAampereAratingAnormallyAmarkedAonAcircuitAbreakers?A-
ACORRECTAANSWERS-OnAtheAhandle
WhichAofAtheAfollowingAisAtheAmostAimportantAconsiderationAwhenAworkingAwithAovercurre
ntAprotectionAdevices?A-ACORRECTAANSWERS-TheAcorrectAinterruptingAcapacity
WhatAisAnormallyAtheAhighestAshortAcircuitAcurrentAinAresidentialAapplications?A-
ACORRECTAANSWERS-10,000A
WhichAofAtheAfollowingAbestAdescribesAwhereAtheANECAallowsAtheAuseAofAEdison-
baseAfuses?A-ACORRECTAANSWERS-ForAreplacementsAinAexistingAinstallations
WhatAmustAbeAusedAinAconjunctionAwithATypeASAplugAfusesAwhenAtheyAareAinstalledAinAaAfu
seAholder?A-ACORRECTAANSWERS-AATypeASAadapter
OnArenewableAcartridgeAfuses,AwhichApartAofAtheAfuseAisAnormallyArenewed?A-
ACORRECTAANSWERS-Link
WhichAofAtheAfollowingAbestAdescribesAaAdualAelementAfuse?A-ACORRECTAANSWERS-
AAfuseAhavingAanAovercurrentAlimitAandAaAtimeAdelayAbeforeAactivation.
AAstanderedAcircuitAbreakerAcontainsA____.A-ACORRECTAANSWERS-AAsetAofAcontacts
AAthermalAelementA
AAmagneticAelement
TheAsmallestAstandardAcircuitAbreakerAsizeAisA_____.A-ACORRECTAANSWERS-15A
TheAamperageAinterruptingAcapacityA(AIC)AofAaAcircuitAbreakerAisAtheA____.A-
ACORRECTAANSWERS-
maximumAshortAcircuitAcurrentAatAwhichAtheAbreakerAwillAsafelyAinterruptAtheAcurrent
AAcurrent-limitingAcircuitAbreakerAprovidesAdownstreamAprotectionAforA____.A-
ACORRECTAANSWERS-OtherAtypesAofAfuses
AAgroundAfaultAcircuitAinterrupterAwillAtripAwhenAaAfaultAcurrentA____.A-
ACORRECTAANSWERS-isA6mAAorAmore
AAdual-
elementAfuseAcanAbeAappliedAinAcircuitsAtoAprovideAbothAshortAcircuitAandA_____Aprotection
.A-ACORRECTAANSWERS-overload
AnAovercurrentAconditionAcanAbeAdefinedAasA____.A-ACORRECTAANSWERS-
eitherAanAoverloadAorAshortAcircuitAcurrent