Siemens GMI Series Instruction

Also see for 15-GMI-1000: Installation operation & maintenance

Interrupter/OperatorDescription Page14«iFigure 24.Secondary Disconnects.Electricalconnectionstotheclose solenoid and trip solenoidaremade through quickdisconnect terminations.Secondary DisconnectSignal and control powerisdeliveredtothe internal circuitsofthebreakerbyanarrangementofmovablecontactfingersmountedonthe left side ofthe circuitbreaker.ThesefingersareshowninFigure 24.Whenthe circuit breakeris racked intotheTestor Con-nectedpositionsin the Metal-Clad switchgear,thesediscon-nect fingers engage amatingdisconnect block on the insideofthe switchgear showninFigure25.Theseelectricalconnections automatically disengage when the circuitbreakerisracked from theTesttothe Disconnect position.All ofthecontrol power necessaryto operatethe circuitbreakeris connectedtothisdisconnect block inside theswitchgear.Theexternaltrip andclose circuitsandstatusindicators are also connectedtothissamedisconnectblock.Figure23.Close(Top)andTrip (Bottom)Solenoids.Theanti-pumprelay(shown in Figure55)electricallyiso-lates signalstothe close solenoid suchthat onlyone releas-ingactionby theclose solenoidcan occurduringeachapplicationofthe close command.The circuit breakermustbe tripped,thesprings recharged andtheclosing signalremoved(interrupted)before theclose solenoidcan beenergized the second time.When thetrip solenoid isenergized, it allows rotation of thejack shaftby thetripping spring.This rotation pulls theinsulating push rods attached to themovablecontactsofthethree vacuum interrupters,and the circuit breakercontactsare opened.Auxiliary SwitchFigure26shows thebreakermountedauxiliary switch.Thisswitchprovidesauxiliarycontacts for controlof circuitbreaker closing and trippingfunctions.Contacts are avail-ablefor useinrelaying and externallogic circuits. Thisswitchisdriven by linkages connectedtothe jack shaft.Theauxiliaryswitch contains both‘b’(Normally Closed)and ‘a’i