Contents Molded-Case Circuit Breakers & Enclosures

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Molded-Case Circuit Breakers & Enclosures27.0-1April 2016Molded-Case CircuitBreakers & EnclosuresSheet 27 001CA08104001EContents22Molded-Case Circuit Breakers & EnclosuresBreaker Type Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.0-2Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.0-3General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.1-1Special Function Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.2-1Application Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.3-1Circuit Breaker Selection Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.4-1Enclosed Circuit Breaker (ECB) withArcflash Reduction Maintenance System . . . . . . . . . . . . . . . . . . . . . . . 27.5-1SpecificationsSee Eaton’s Product Specification Guide, available on CD or on the Web.CSI Format: . . . . . . . . . . . . . . . . . . . . . . . . . . 19952010Molded-Case Circuit Breakers. . . . . . . . . Section 16475Section 26 28 11Electronic Trip Units . . . . . . . . . . . . . . . . . Section 16904Section 26 28 50Enclosed Circuit Breakers . . . . . . . . . . . . Section 16476Section 26 28 ded-Case Circuit BreakersFor more information, visit: www.eaton.com/consultants

27.0-2 Molded-Case Circuit Breakers & EnclosuresBreaker Type ComparisonApril 2016Sheet 27 0022223242526Summary of Differences Between Low Voltage Power Circuit Breakers,Insulated-Case Circuit Breakers and Molded-Case Circuit BreakersThere are two main classifications of low voltage circuitbreakers—molded-case circuit breakers and low voltagepower circuit breakers. All UL , NEMA and ANSI standardsare for molded-case circuit breakers and low voltagepower circuit breakers.The industry recognizes three types of circuit breakers—molded-case circuit breakers (MCCB), insulated-case circuitbreakers (ICCB) and low voltage power circuit breakersLVPCB). Insulated-case circuit breakers are designed tomeet the standards for molded-case circuit breakers.Low voltage power circuit breakers comply with thefollowing standards: ANSI Std. C37.16—Preferred RatingsANSI Std. C37.17—Trip Devices for LVPCB ANSI Std. C37.50—Test Procedures IEEE Std. C37.13—LVPCB Used in Enclosures UL 1066—LVPCB Molded-case circuit breakers and insulated-case circuitbreakers typically comply with the following standards: UL 489—MCCBUL 489—Molded-Case Switches (MCS) NEMA AB1—MCCB and MCS NEMA AB3—MCCB Application27 28Table 27.0-1. Breaker Type Comparison Chart29DescriptionLVPCB(Type Magnum DS and Series NRX )ICCB(Type Magnum SB and Series NRX)MCCB(QUICKLAG/Series C /Series G )30Select tripshort-time ratingSelective trip over full range of faultcurrents up to interrupting rating(high short-time ratings)31Selective trip over partial range of faultcurrents within the interrupting rating(medium short-time ratings). Typicallyup to 35 kASelective trip over a smaller range of faultcurrents within the interrupting rating (lowshort-time ratings). Typically 10–13 timesthe frame sizeOperator typeTypes of operators: mechanicallyoperated and electrically operatedtwo-step stored energyTypes of operators: mechanically operatedover-center toggle or motor operator32Types of operators: mechanicallyoperated and electrically operatedtwo-step stored energyClosing speed5-cycle closing for electricallyoperated devices5-cycle closing for electricallyoperated devicesGreater than 5-cycle closing for electricallyoperated devicesMountingAvailable in drawout constructionpermitting racking to a distinct “testposition” and removal for maintenanceAvailable in drawout constructionpermitting racking to a distinct “testposition” and removal for maintenanceTypically fixed-mounted but large framesizes may be available in drawoutconstructionInterrupting ratingInterrupting duty at 635 Vac:42–100 kA and current limiting withor without fuses up to 200 kAInterrupting duty at 508 Vac:35–150 kAInterrupting duty at 480 Vac:22–100 kA without fuses and upto 200 kA with integral fuses or forcurrent-limiting typeCurrent limitingSpecial current limiting types availablewith or without fuses up to 200 kASpecial current limiting types availablewithout fuses up to 150 kACurrent limiting available with and withoutfuses up to 200 kARelative costHigherMediumLowAvailableframe sizesSmall number of frame sizes available.Typical 800–6000 ASmall number of frame sizes available.Typical 800–6000 ALarge number of frame sizes available.Typical 100–2500 AMaintenanceExtensive maintenance possible on allframe sizesLimited maintenance possible on largerframe sizesVery limited maintenance possible on largerframe sizesEnclosure typesUsed in enclosures, MCCs, switchboardsand switchgearUsed in enclosures, MCCsand switchboardsUsed in enclosures, panelboards,switchboards, MCCs and control panelsSeries ratingsNot available in series ratingsNot available in series ratingsAvailable in series ratingsEnclosed rating100% continuous current rated inits enclosure80% continuous-current rated, unlessspecifically stated to be rated 100% inan enclosure80% continuous-current rated, unlessspecifically stated to be rated 100% inan enclosureStandardsANSI/IEEE C37UL 1066NEMA AB1/AB3UL 489 or UL 1066NEMA AB1/AB3UL 4893334353637383940414243For more information, visit: www.eaton.com/consultantsCA08104001E

April 2016Molded-Case Circuit Breakers & EnclosuresMolded-Case Circuit Breakers27.0-3Sheet 27 003Molded-Case Circuit Breakers222324252627Series GTable of Contents28General DescriptionCircuit Breaker Components and Functions . . . . .Electronic RMS Trip Units . . . . . . . . . . . . . . . . . . . .Accessories and Modifications . . . . . . . . . . . . . . . .Special Function Circuit BreakersMolded-Case Switches . . . . . . . . . . . . . . . . . . . . . .Motor Circuit Protectors . . . . . . . . . . . . . . . . . . . . .Current Limiting Breakers . . . . . . . . . . . . . . . . . . . .100% Rated Breakers . . . . . . . . . . . . . . . . . . . . . . . .Series Rated Breaker Combinations. . . . . . . . . . . .High Instantaneous Breakers forSelective Coordination . . . . . . . . . . . . . . . . . . . . .Earth Leakage Circuit Breakers . . . . . . . . . . . . . . . .AFCI Circuit Breakers. . . . . . . . . . . . . . . . . . . . . . . .DC Rated Breakers . . . . . . . . . . . . . . . . . . . . . . . . . .400 Hz Breaker Application . . . . . . . . . . . . . . . . . . .HID Rated Breakers . . . . . . . . . . . . . . . . . . . . . . . . .Lighting Control Solenoid Operated Breakers . . .SWD Rated Breakers . . . . . . . . . . . . . . . . . . . . . . . .HACR Rated Breakers . . . . . . . . . . . . . . . . . . . . . . .Engine Generator Circuit Breakers. . . . . . . . . . . . .Mining Circuit Breakers. . . . . . . . . . . . . . . . . . . . . .Naval/Marine Rated Breakers . . . . . . . . . . . . . . . . .Welding Circuit Breakers. . . . . . . . . . . . . . . . . . . . .Application DataContinuous Ampere Rating. . . . . . . . . . . . . . . . . . .Circuit Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Interrupting Ratings . . . . . . . . . . . . . . . . . . . . . . . . .Circuit Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . .Number of Poles . . . . . . . . . . . . . . . . . . . . . . . . . . .Ground Fault Protection . . . . . . . . . . . . . . . . . . . . .Code Considerations . . . . . . . . . . . . . . . . . . . . . . . .Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Feeder Circuits . . . . . . . . . . . . . . . . . . . . . . . . . .Branch Circuits . . . . . . . . . . . . . . . . . . . . . . . . . .Circuit Breakers Not hp Rated . . . . . . . . . . . . . .Motor Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . .Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . .Slash Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cable Sizing/Selection . . . . . . . . . . . . . . . . . . . e Current Curve Characteristics . . . . . . . . . . . .Selective Coordination . . . . . . . . . . . . . . . . . . . . . .Breaker Selection Table—100% Selective . . . .Breaker Selection Table—0.1 Sec Selective . .Arc Flash. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Arcflash Reduction Maintenance System . . . . . . .Unusual Environmental Conditions. . . . . . . . . . . .Reverse-Feed Applications . . . . . . . . . . . . . . . . . . .Circuit Breaker Selection DataOverview Tables . . . . . . . . . . . . . . . . . . . . . . . . . . .QUICKLAG Industrial Circuit Breakers . . . . . .Series G Industrial Circuit Breakers . . . . . . . . .Series C Industrial Circuit Breakers . . . . . . . . .Current Limiting Industrial Circuit Breakers. . .Industrial Circuit Breakers in Assemblies. . . . .Electronic Trip Units . . . . . . . . . . . . . . . . . . . . . .Digitrip OPTIM . . . . . . . . . . . . . . . . . . . . . . . . . .Individual Circuit Breaker Selection Data . . . . . . .QUICKLAG Industrial Circuit Breakers . . . . . . .QUICKLAG Solenoid-OperatedCircuit Breakers . . . . . . . . . . . . . . . . . . . . . . . .Series G Industrial Circuit Breakers . . . . . . . . .Series C Industrial Circuit Breakers . . . . . . . . .Series G Breaker Accessories . . . . . . . . . . . . . .Series C Breaker Accessories . . . . . . . . . . . . . .High Instantaneous Circuit Breakerfor Selective Coordination . . . . . . . . . . . . . . .Motor Circuit Protectors (MCP) . . . . . . . . . . . . .Motor Protector Circuit Breaker (MPCB) . . . . .Power Monitoring and MeteringModule (PM3). . . . . . . . . . . . . . . . . . . . . . . . . .Earth Leakage Circuit Breakers . . . . . . . . . . . .Current Limiting Modules and Breakers . . . . .Circuit Breaker Enclosures. . . . . . . . . . . . . . . . .Enclosed Circuit (ECB) with Arcflash ReductionMaintenance SystemGeneral Description. . . . . . . . . . . . . . . . . . . . . . . . .Product Description. . . . . . . . . . . . . . . . . . . . . . . . .Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Standards and Certifications . . . . . . . . . . . . . . . . .Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . .Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .For more information, visit: 04127.5-127.5-127.5-127.5-127.5-227.5-327.5-34243

27.0-4 Molded-Case Circuit Breakers & EnclosuresApril 2016Sheet 27 00422This page intentionally left r more information, visit: www.eaton.com/consultantsCA08104001E

Molded-Case Circuit Breakers & EnclosuresMolded-Case Circuit BreakersApril 201627.1-1Sheet 27 005General DescriptionGeneral DescriptionGeneral CircuitBreaker InformationEaton’s molded-case circuit breakersare designed to provide circuitprotection for low voltage distributionsystems. They are described byNEMA as, “. . . a device for closingand interrupting a circuit betweenseparable contacts under both normaland abnormal conditions,” and furthermore as, “. . . a breaker assembledas an integral unit in a supportingand enclosing housing of insulatingmaterial.” The NEC describes them as,“A device designed to open and closea circuit by non-automatic means, andto open the circuit automatically on apredetermined overload of current,without injury to itself when properlyapplied within its rating.”So designed, Eaton circuit breakersprotect conductors against overloadsand conductors and connectedapparatus, such as motors andmotor starters, against short circuits.Circuit Breaker Componentsand FunctionsBeing essentially high interruptingcapacity switches with repetitiveelements, Eaton circuit breakersare comprised of three mainfunctional components. These are:1. Trip elements (thermal-magneticor electronic)2. Operating mechanism3. Arc extinguishers1. Trip ElementsThe function of the trip element is to tripthe operating mechanism in the eventof a prolonged overload or short-circuitcurrent. To accomplish this, a thermalmagnetic trip action is provided.Thermal-Magnetic BreakersEaton thermal-magnetic breakers aregeneral purpose devices suitable forthe majority of breaker applicationsand are considered the industrystandard. Available from 15–800 A,thermal-magnetic breakers provideaccurate reliable overload and shortcircuit protection for conductors andconnected apparatus.Thermal trip action is achievedthrough the use of a bimetal heated bythe load current. On a sustained overload, the bimetal will deflect, causingthe operating mechanism to trip.Because bimetals are responsive tothe heat emitted by the current flow,they allow a long-time delay on lightoverloads, yet they have a fastresponse on heavier overloads.Magnetic trip action is achieved throughthe use of an electromagnet in serieswith the load current. This provides aninstantaneous tripping action when thecurrent reaches a predetermined value.Front-adjustable magnetic trip elementsare supplied as standard on 250 A framecircuit breakers and above (except 100 Aand 150 A magnetic only breakers), allother thermal-magnetic breakers havenon-adjustable magnetic trip elements.Electronic RMS Trip BreakersEaton electronic trip breakers aregenerally applied for applicationswhere high levels of system coordination are called for. Available from20–2500 A, today’s electronic tripbreakers can provide superiorprotection and coordination as wellas system alarms and diagnostics,monitoring and communications.Both the overload trip action and theshort-circuit trip action of breakerswith Digitrip electronic trip unitsare achieved by the use of currenttransformers and solid-state circuitrythat monitors the current and initiatestripping through a flux shunt tripwhen an overload or a short circuitis present. All multiple-pole circuitbreakers have trip elements in eachpole and a common trip bar. Anabnormal circuit condition in anyone pole will cause all poles to opensimultaneously.Electronic RMS trip breakers caninclude trip features such as: Adjustable long-time pickupAdjustable short-time pickupAdjustable long delay timeAdjustable short delay timeAdjustable instantaneous pickupAdjustable ground fault pickupAdjustable ground fault delay timeZone selective interlockingCommunicationsTrip unit adjustments are made bysetting switches on the front of the tripunit or by programming the trip unitelectronically.All electronic RMS trip breakers areequipped with a manual push-to-tripmechanism.2223242. Operating MechanismThe function of the operating mechanism is to provide a means of openingand closing the breaker contacts. Allmechanisms are of the quick-make,quick-break type and are “trip free.”“Trip free” mechanisms are designedso that the contacts cannot be heldclosed against an abnormal circuitcondition and are sometimes referredto as an “overcenter toggle mechanism.”In addition to indicating whether thebreaker is “on” or “off,” the operatingmechanism handle indicates when thebreaker is “tripped” by moving to aposition midway between the extremes.This distinct trip point is particularlyadvantageous where breakers aregrouped, as in panelboard applications,because it clearly indicates the faultycircuit. The operating mechanismcontains a positive on feature. In thenormal switching operation, thehandle of the circuit breaker will notbe capable of being left readily at or nearthe off position when the main contactsare closed.253. Arc Extinguishers34The function of the DE-ION arcextinguisher is to confine, divideand extinguish the arc drawn betweenopening breaker contacts. It consists ofspecially shaped steel grids isolatedfrom each other and supported by aninsulating housing. When the contactsare opened, the arc drawn induces amagnetic field in the grids, which inturn draws the arc from the contactsand into the grids. The arc is thus splitinto a series of smaller arcs and theheat generated is quickly dissipatedthrough the metal. These two actionsresult in a rapid removal of ions fromthe arc, which hastens dielectric buildup between the contacts and results inrapid extinction of the or more information, visit: www.eaton.com/consultants

27.1-2 Molded-Case Circuit Breakers & EnclosuresMolded-Case Circuit BreakersApril 2016Sheet 27 006General Description—Trip Units22Electronic RMS Trip UnitGeneral23242526272829303132333435363738Eaton offers the most comprehensiverange of electronic trip units in theindustry for molded-case circuitbreakers. All electronic trip units are rmssensing and can be applied from 70 Aup through 2500 A. Eaton offers electronic trip units as standard for circuitbreakers rated above 800 A, and offerselectronic trip units as optional for circuit breakers 70 A up through 800 A.Digitrip electronic trip units are ACdevices that employ microprocessorbased technology that provides a truerms current sensing means for propercorrelation with thermal characteristicsof conductors and equipment. Theprimary function of the Digitripelectronic trip unit is to providecircuit protection. This is achievedby analyzing the secondary currentsignals received from the circuitbreaker current sensors and initiatingtrip signals to the circuit breaker shunttrip when pre-set current levels andtime delay settings are exceeded. AllEaton electronic trip units use a higheffective sampling rate to maintainmeasurement accuracy, monitoring,and protection with nonlinear loadshaving harmonic content up to the27th order.Front-Adjustable Trip UnitsRating PlugsFront-adjustable trip units areelectronic trip units that have up tonine time-current setting options thatare set by switches mounted on thefront of the trip unit. The applicationfor front adjustable trip units wouldbe distribution systems that can becoordinated within the range ofsettings available and that do notrequire sophisticated coordinationstrategies to be applied downthrough the distribution system tosmall rated breakers.Rating plugs provide a means toestablish the breaker’s continuouscurrent rating. Rating plugs are colorcoded and interchangeable to make iteasy to match the correct rating plugwith the correct trip unit. The samerating plug can be applied to both 50and 60 Hz distribution systems. Somerating plugs are fixed and some havean adjustable range of amperagevalues for greater flexibility. Digitrip310, 510, 610, 810 and 910 trip units canbe supplied with either a fixed oradjustable rating plug. Digitrip 310 trip units are equipped with adjustablerating plugs. OPTIM style trip units arefurnished with fixed rating plugs buthave a programmable Long TimePickup rating to allow applicationover a range of amperage values.Programmable Trip Units (OPTIM)Programmable trip units are electronictrip units that have up to 10 timecurrent setting options that areprogrammed electronically by theuse of a programming device. Theapplication for programmabletrip units would be high integritydistribution systems that requiresuperior levels of system coordinationcoupled with system alarming,diagnostics and monitoring.Electronic trip units are applied todistribution systems when high standards of protection and coordinationare called for. In addition, electronictrip units can provide further enhancedfea

molded-case circuit breakers (MCCB), insulated-case circuit breakers (ICCB) and low voltage power circuit breakers LVPCB). Insulated-case circuit breakers are designed to meet the standards for molded-case circuit breakers. Low voltage power circuit breakers comply with the following standards: ANSI Std. C37.16—Preferred Ratings

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