Contents Molded-Case Circuit Breakers & Enclosures - Eaton

1 CA08104001 EFor more information, visit: 2016 ContentsMolded-Case Circuit Breakers & 2722232425262728293031323334353637383940 41424 3 001 Molded-Case CircuitBreakers & EnclosuresMolded-Case Circuit Breakers & EnclosuresBreaker Type Comparison .. of Contents .. Description.. Function Circuit Breakers .. Data.. Breaker Selection Data .. Circuit Breaker (ECB) with Arcflash Reduction Maintenance System.. Eaton s Product Specification Guide, available on CD or on the Format: .. 19952010 Molded-Case Circuit Breakers ..Section 16475 Section 26 28 11 Electronic Trip Units ..Section 16904 Section 26 28 50 Enclosed Circuit Breakers ..Section 16476 Section 26 28 Circuit more information, visit: 2016 Molded-Case Circuit Breakers & EnclosuresSheet 2722232425262728293031323334353637383940 41424 3 Breaker Type Comparison002 Summary of Differences Between Low Voltage Power Circuit Breakers , Insulated-Case Circuit Breakers and Molded-Case Circuit BreakersThere are two main classifications of low voltage Circuit Breakers Molded-Case Circuit Breakers and low voltage power Circuit Breakers .

2 All UL , NEMA and ANSI standards are for Molded-Case Circuit Breakers and low voltage power Circuit Breakers . The industry recognizes three types of Circuit Breakers 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 voltage power Circuit Breakers comply with the following standards: ANSI Std. Preferred Ratings ANSI Std. Trip Devices for LVPCB ANSI Std. Test Procedures IEEE Std. LVPCB Used in Enclosures UL 1066 LVPCBM olded-case Circuit Breakers and insulated-case Circuit Breakers typically comply with the following standards: UL 489 MCCB UL 489 Molded-Case Switches (MCS) NEMA AB1 MCCB and MCS NEMA AB3 MCCB ApplicationTable Breaker Type Comparison Chart DescriptionLVPCB(Type Magnum DS and Series NRX )ICCB(Type Magnum SB and Series NRX)MCCB(QUICKLAG/Series C /Series G )Select trip short-time ratingSelective trip over full range of fault currents up to interrupting rating (high short-time ratings)Selective trip over partial range of fault currents within the interrupting rating (medium short-time ratings).

3 Typically up to 35 kASelective trip over a smaller range of fault currents within the interrupting rating (low short-time ratings). Typically 10 13 times the frame sizeOperator typeTypes of operators: mechanically operated and electrically operated two-step stored energyTypes of operators: mechanically operated and electrically operated two-step stored energyTypes of operators: mechanically operated over-center toggle or motor operatorClosing speed5-cycle closing for electrically operated devices5-cycle closing for electrically operated devicesGreater than 5-cycle closing for electrically operated devicesMountingAvailable in drawout construction permitting racking to a distinct test position and removal for maintenanceAvailable in drawout construction permitting racking to a distinct test position and removal for maintenanceTypically fixed-mounted but large frame sizes may be available in drawout constructionInterrupting ratingInterrupting duty at 635 Vac.

4 42 100 kA and current limiting with or without fuses up to 200 kAInterrupting duty at 508 Vac: 35 150 kAInterrupting duty at 480 Vac: 22 100 kA without fuses and up to 200 kA with integral fuses or for current-limiting typeCurrent limitingSpecial current limiting types available with or without fuses up to 200 kASpecial current limiting types available without fuses up to 150 kACurrent limiting available with and without fuses up to 200 kARelative costHigherMediumLowAvailable frame 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 all frame sizesLimited maintenance possible on larger frame sizesVery limited maintenance possible on larger frame sizesEnclosure typesUsed in Enclosures , MCCs, switchboards and switchgearUsed in Enclosures , MCCs and 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 in its enclosure80% continuous-current rated, unless specifically stated to be rated 100% in an enclosure80% continuous-current rated, unless specifically stated to be rated 100% in an enclosureStandardsANSI/IEEE C37UL 1066 NEMA AB1/AB3UL 489 or UL 1066 NEMA AB1/AB3UL 489CA08104001 EFor more information, visit.

5 2016 Molded-Case Circuit Breakers & EnclosuresSheet 2722232425262728293031323334353637383940 41424 3 Molded-Case Circuit Breakers003 Molded-Case Circuit BreakersSeries GTable of ContentsGeneral DescriptionCircuit Breaker Components and Functions .. RMS Trip Units .. and Modifications .. Function Circuit BreakersMolded-Case Switches .. Circuit Protectors .. Limiting Breakers .. Rated Breakers .. Rated Breaker Combinations.. Instantaneous Breakers for Selective Coordination .. Leakage Circuit Breakers .. Circuit Breakers .. Rated Breakers .. Hz Breaker Application .. Rated Breakers .. Control Solenoid operated Breakers .. Rated Breakers .. Rated Breakers .. Generator Circuit Breakers .. Circuit Breakers .. Rated Breakers .. Circuit Breakers .. DataContinuous Ampere Rating.. Voltage .. Ratings .. Frequency .. of Poles .. Fault Protection .. Considerations.

6 Circuits .. Circuits .. Breakers Not hp Rated .. Circuits .. Rating .. Sizing/Selection .. Current Curve Characteristics .. Coordination .. Selection Table 100% Selective .. Selection Table Sec Selective .. Flash.. Reduction Maintenance System .. Environmental Conditions .. Applications .. Breaker Selection DataOverview Tables .. Industrial Circuit Breakers .. G Industrial Circuit Breakers .. C Industrial Circuit Breakers .. Limiting Industrial Circuit Breakers .. Circuit Breakers in Assemblies.. Trip Units .. OPTIM .. Circuit Breaker Selection Data .. Industrial Circuit Breakers .. Solenoid- operated Circuit Breakers .. G Industrial Circuit Breakers .. C Industrial Circuit Breakers .. G Breaker Accessories .. C Breaker Accessories .. Instantaneous Circuit Breaker for Selective Coordination .. Circuit Protectors (MCP) .. Protector Circuit Breaker (MPCB).

7 Monitoring and Metering Module (PM3).. Leakage Circuit Breakers .. Limiting Modules and Breakers .. Breaker Enclosures .. Circuit (ECB) with Arcflash ReductionMaintenance SystemGeneral Description.. Description .. and Certifications .. Selection .. Diagram .. more information, visit: 2016 Molded-Case Circuit Breakers & EnclosuresSheet 2722232425262728293031323334353637383940 41424 3 004 This page intentionally left more information, visit: 2016 Molded-Case Circuit Breakers & EnclosuresSheet 2722232425262728293031323334353637383940 41424 3 Molded-Case Circuit BreakersGeneral Description005 General DescriptionGeneral Circuit Breaker InformationEaton s Molded-Case Circuit Breakers are designed to provide Circuit protection for low voltage distribution systems. They are described by NEMA as, .. a device for closing and interrupting a Circuit between separable contacts under both normal and abnormal conditions, and further-more as.

8 A breaker assembled as an integral unit in a supporting and enclosing housing of insulating material. The NEC describes them as, A device designed to open and close a Circuit by non-automatic means, and to open the Circuit automatically on a predetermined overload of current, without injury to itself when properly applied within its rating. So designed, Eaton Circuit Breakers protect conductors against overloads and conductors and connected apparatus, such as motors and motor starters, against short Breaker Components and FunctionsBeing essentially high interrupting capacity switches with repetitive elements, Eaton Circuit Breakers are comprised of three main functional components. These are: 1. Trip elements (thermal-magnetic or electronic)2. Operating mechanism3. Arc extinguishers1. Trip ElementsThe function of the trip element is to trip the operating mechanism in the event of a prolonged overload or short- Circuit current.

9 To accomplish this, a thermal-magnetic trip action is BreakersEaton thermal-magnetic Breakers are general purpose devices suitable for the majority of breaker applications and are considered the industry standard. Available from 15 800 A, thermal-magnetic Breakers provide accurate reliable overload and short- Circuit protection for conductors and connected trip action is achieved through the use of a bimetal heated by the load current. On a sustained over-load, the bimetal will deflect, causing the operating mechanism to trip. Because bimetals are responsive to the heat emitted by the current flow, they allow a long-time delay on light overloads, yet they have a fast response on heavier trip action is achieved through the use of an electromagnet in series with the load current. This provides an instantaneous tripping action when the current reaches a predetermined value. Front-adjustable magnetic trip elements are supplied as standard on 250 A frame Circuit Breakers and above (except 100 A and 150 A magnetic only Breakers ), all other thermal-magnetic Breakers have non-adjustable magnetic trip RMS Trip BreakersEaton electronic trip Breakers are generally applied for applications where high levels of system coordina-tion are called for.

10 Available from 20 2500 A, today s electronic trip Breakers can provide superior protection and coordination as well as system alarms and diagnostics, monitoring and the overload trip action and the short- Circuit trip action of Breakers with Digitrip electronic trip units are achieved by the use of current transformers and solid-state circuitry that monitors the current and initiates tripping through a flux shunt trip when an overload or a short Circuit is present. All multiple-pole Circuit Breakers have trip elements in each pole and a common trip bar. An abnormal Circuit condition in any one pole will cause all poles to open RMS trip Breakers can include trip features such as: Adjustable long-time pickup Adjustable short-time pickup Adjustable long delay time Adjustable short delay time Adjustable instantaneous pickup Adjustable ground fault pickup Adjustable ground fault delay time Zone selective interlocking CommunicationsTrip unit adjustments are made by setting switches on the front of the trip unit or by programming the trip unit electronic RMS trip Breakers are equipped with a manual push-to-trip Operating MechanismThe function of the operating mecha-nism is to provide a means of opening and closing the breaker contacts.