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.comWestinghouse Electric CorporationRelay and Telecommunications DivisionCoral Springs, FL 33065Technical Data41-060Page 1April, 1987Supersedes 41-060 T WE Apages 1-8, dated February 4, 1975E, D, C/41-000ADeviceDefinitionNumberand FunctionStopping device is a control device used primarily to shut down anequipment and hold it out of operation. [ This device may be manuallyor electrically actuated, but exeludes the function of electricallockout (see device function 86) onabnormal conditions. ]6Starting circuit breaker is aThese numbers are based on a systemadopted as standard for automatic switchgearby IEEE, and incorporated in American Standard C37.2-1970. This system is used in connection diagrams, in instruction books, and inspecificationsand Function1device whose principal function isto connect a machine to its sourceof starting voltage.---------Master Element is the initiatingdevice, such as a control switch,voltage relay, float switch, etc.,which serves either directly, orthrough such permissive devices asprotective and time-delay relays toplace an equipment in or out ofoperationarDefinitionNumber78Time-delay starting, or closingrelay is a device which functions to13Synchronous-speed device, suchas a centrifugal-speed switch, aslip-frequency relay, a voltagerelay, an undercurrent relay or anytype of device, operates at approximately synchronous speed of amachine.14Under-speed device functionswhen the speed of a machine fallsbelow a predetermined value.15Control power disconnectingdevice is a disconnective device-such as a knife switch, circuitbreaker or pullout fuse block, usedfor the purpose of connecting anddisconnecting the source of controlpower to and from the control busor equipment.16Reserved for future application.17Shunting or discharge switchis a device which operates in response to the position of a numberof other devices, (or to a number ofpredetermined conditions), in anequipment to allow an operatingsequence to proceed, to stop, orto provide a check of the positionof these devices or of these conditions for any purpose.Master contactor is a device,generally controlled by deviceNo. 1 or equivalent and the requiredpermissive and protective devices,that serve to make and break thenecessary control circuits to placean equipment into operation underthe desired conditions and to takeit out of operation under other orabnormal conditions.www4Note. This excludes dev1ces wh1ch performsary in the process of startmg a mach1ne byelude aux1l1ary power wh1ch suppl1es suchdev1ces 6 or 42, or the1r equivalent. andapparatus as small motors and heaters910also excludes dev1ce 73 function wh1chserves for the switch1ng of resistorsReversing device is used for thepurpose of reversing a machinefield or for performing any otherreversing functions.1811Reserved for future application.12Over-speed device is usually adirect-connected speed switchwhich functions on machine overspeed.Accelerating or decelerating device is used to close or to ca,Jse theclosing of circuits which are usedto increase or to decrease the speedof a machine.Unit sequence switch is used tochange the sequence in which unitsmay be placed in and out of servicein multiple-unit equipments.serves to open or to close a sh mting circuit around any piece ofapparatus (except a resistor), suchas a machine field, a machine armature, a capacitor or a reactor.such shuntmg operat1ons as may be neces-Note· Control power 15 cons1dered to 1n-Checking or interlocking relay.Elec3trigive a desired amount of timedelay before or after any point ofoperation in a switching sequenceor protective relay system, exceptas specifically provided by devicefunctions 48, 62, and 79 describedlater.Speed or frequency, matchingdevice functions to match andhold the speed or the frequency ofa machine or of a system equal to,or approximately equal to, that ofanother machine, source or system.in the anode circuits of a powerrectifier for the primary purpose ofinterrupting the rectifier circuit if anarc back should occur.ca2Definitionand FunctionAnode circuit breaker is one usedlPDeviceDeviceNumberan5tMThe devices 1n switching equipments are referred to by numbers, with appropriate suff1xletters when necessary, according to thefunctions they performIEEE Device Numbersand FunctionsFor SwitchgearApparatusualsSelections from ANSI C37.2-197019Starting-to-running transitioncontactor is a device which oper-ates to initiate or cause the automatic transfer of a machine fromthe starting to the running powerconnection.20Elect ricall y operated valve is anelectrically operated, controlled ormonitored valve in a fluid line.tNote The funct1on of he valve may be1/ld1cated by the use of the suff1xes. seePage 5

.comTechnical Data41-060Page umberand FunctionNumberand FunctionNumberand Function31nects a circuit such as the shuntfield of a synchronous converter,to a source of separate excitationduring the starting sequence; orone which energizes the excitationand ignition circuits of a powerrectifier.32Note An example IS a thermostat whichswitches on a space heater 1n a switchgearassembly when the temperature falls to ades1red value as distinguished from a de-33vice which 15 used to prov1de automatiCtemperature regulation between close2534Synchronizing or synchronismcheck device operates when twolecfunctions when the temperature ofthe shunt field or the armortisseurwinding of a machine, or that of aload limiting or load shifting resistoror of a liquid or other medium ex ceeds a predetermined value; or ifthe temperature of the protectedapparatus, such as a power recti tier, or of any medium decreasesbelow a predetermined value.Undervoltage relay is a devicewhich functions on a given valueof undervoltage.w27Apparatus thermal device.E262935Field circuit breaker is a devicewhich functions to apply, or toremove, the field excitation of amachine.42Running circuit breaker is adevice whose principal function isto connect a machine to its sourceof running or operating voltage.This function may also be used for adevice, such as a contactor. that isused in series with a circuit breakeror other fault protecting means,primarily for frequent opening andclosing of the circuit.Position switch makes or breaksMaster sequence device is adevice such as a motor operatedmulti contact switch, or the equiv alent, or a programming device,such as a computer, that establishesor determines the operating sequence of the major devices in anequipment du ring start ing a ndstopping or during other sequentialswitching operations.monitors the presence of the pilotor main flame in such apparatus asa gas turbine or a steam boiler.Isolating contactor is used ex pressly for disconnecting one cir cuit from another for the purposesof emergency operation, mainte nance, or test.Brush-operating, or slip-ring-short-circuiting, device is usedfor raising, lowering, or shiftingthe brushes of a machine, or forshort circuiting its slip rings, or forengaging or disengaging the con tacts of a mechanical rectifier.363743Unit sequence starting relay is adevice which functions to start thenext available unit in a multiple unit equipment on the failure or onthe non availability of the normallypreceding unit.45Atmospheric condition monitoris a device that functions upon theoccurrence of an abnormal atmos pheric condition, such as damagingfumes, explosive mixtures, smoke,or fire.46Reverse-phase, or phase-balance, current relay is a relaywhich functions when the poly phase currents are of reverse phasesequence, or when the polyphasecurrents are unbalanced or containnegative phase sequence compo nents above a given amount.Undercurrent or underpoweror power flow decreases below apredetermined value.Bearing protective device tunc tions on excessive bearing tempera ture, or on other abnormal mechan ical conditions, such as undue wear,which may eventually result inexcessive bearing temperature.Manual transfer or selectordevice transfers the control cir-44relay functions when the current38 cuits so as to modify the plan ofoperation of t h e switching equip ment or of some of the devices.Polarity or polarizing voltagedevice operates or permits theoperation of another device on apredetermined polarity only orverifies the presence of a polarizingvoltage in an equipment.Flame detector is a device thatww2841triac circuits are within the desiredlimits of frequency, phase angle orvoltage, to permit or to cause theparalleling of these two circuits.Field relay functions on a given orabnormally low value or failure ofmachine field current or on anexcessive value of the reactivecomponent of armature current inan ac machine indicating abnor mally low field excitation.which functions on a desired valueof power flow in a given direction,or upon reverse power resultingfrom arc back in the anode orcathode circuits of a power rectifiercathat functions when the ratio ofvoltage to frequency exceeds apre-set value. The relay may havean instantaneous or inverse timecharacteristic.Mechanical condition monitoris a device that functions upon theoccurrence of an abnormal me chanical condition (except thatassociated with bearings as coveredunder device function 38), such asexcessive vibration, eccentricity,expansion, shock. tilting, or sealfailure.Directional power relay is onelP Volts per hertz relay is a relay40contact when the main device orpiece of apparatus, which has nodevice function number, reaches agiven position.lim1ts and would be des1gnated as 90T24Separate excitation device con 39ualsmatically reset device that givesa number of separate visual indi cations upon the functioning ofprotective devices, and which mayalso be arranged to perform alockout functionTemperature control devicefunctions to raise or to lower thetemperature of a machine or otherapparatus, or of any medium, whenits temperature falls below, or risesabove, a predetermined value.Annunciator relay is a nonauto an23Equalizer circuit breaker is abreaker which serves to control orto make and break the equalizer orthe current balancing connectionsfor a machine field, or for regu lating equipment in a multiple unit installation30tM22Distance relay i s a device whichfunctions when the circuit admit tance, impedance or reactanceincreases or decreases beyond pre determined limits.ar2147Phase-sequence voltage relayfunctions upon a predeterminedvalue of polyphase voltage in thedesired phase sequence.(8 Added since previous issue.