Document g2Ep3bKDQEr1LMxYEr2dKq0zL

AB De-ion5 circuit breakers descriptive bulletin ---------------------------------------------------------- 1 29-150 amperes: 15 to 2000 i maximum volts: 600 volts a-c 250 volts d-c I page 1 Westinghouse molded case breakers are designed for circuit protection oi low voltage distribution systems. They are suitable for application as main breakers and for protection of branch and feeder circuits and connected apparatus. These breakers provide overload protection for conductors and short-circuit protection for all circuit elements such as conductors, motors and starters. They are designed for use in switchboards, control centers, panelboards, combination starters, bus duct plug-in units and separate individual enclosures. In these various enclosures they are applicable to the requirements of lighting, distribution and other power circuits. Standard current ratings of AB De-ion circuit breakers correspond in general to the standard ratings in the N.E.C. Paragraph 240-7b. These breakers are primarily designed for the protection of con ductors, both aluminum and copper. accurate reliable protection: In a controlled temperature the overload element in each pole of every breaker is individually calibrated and tested to meet Underwriters' Laboratories, Inc. requirements. Especially hardened, ground and polished trip latches assure continuous and accurate tripping characteristics. De-ion arc quenching: Using De-ion arc quenchers, developed by Westinghouse, AB De-ion circuit breakers positively extinguish dangerous arcs in a fraction of a second. Coupled with a positive action quick-make, quick-break toggle mechanism, burning and pitting oi contact surfaces is minimal and long circuit breaker life is assured, reduced downtime and maintenance costs: Designed for repetitive duty, circuit breakers are long-lived, maintenance-free and prevent costly and unnecessary shutdowns. Because the breaker is a resettable device, downtime amounts to only a matter of seconds after the overload or fault has been corrected. xednced operation cost: Incorporating welded internal parts, high contact pressure, and silver alloy butt type contacts, a circuit breaker offers considerably less resistance to electrical current than the fuse clips, bolted joints and hinge joints of a fusible device. With a lower watts loss, electrical power cost savings result when breakers are used. single-phase protection: A fault or overload on any one phase opens all poles of the breaker minimizing the possibility of single phasing polyphase motors. dnal protective elements: Bi-metallic thermal elements pro tect on overloads where inverse time tripping is desirable, mag netic trip elements operate the breaker instantly on dangerous fault currents. Trip-free, the breaker connot be held closed under fault conditions. maximnm safety: Molded case circuit breakers are dead front and personnel are not exposed to "live" parts. Line terminal shields are available for additional protection when required. tamperproof: The complete breaker or trip unit is sealed at the factory to prevent tampering and alteration of :ts rating. March, 1965 iupnoda d--criptiTM bulletin 29-150, 1-16, d*t*d August, 1960 m*il*d to: C/1136, 1137/DB; D/806/DB; C/308/DB; C/312/CB 21408 page 2 ; type QuicklagS Quicklag$ QCC P & B C incl --Included in >11 cues. add --Accessory or mod ification available, price additions on respective breaker pages. spec--Specify when re quired. 1 I 1 E and EA H 1, 2, 3 poles 10-100 amps (5 40=C 1, 2, 3 poles 2, 3 poles 10-100 amps 12S-22S amps @ 40 C |@ 40'C 1, 2, 3 poles 15*100 amps <2. AOC 1,2, 3 poles 15-100 amps & 405C I 2, 3 poles 3) ' 15-100 amps . (a. 40'C dimensions, inches 3-pole height width depth a-c ratings max. voltage interrupting ratings U/L NEMA 27s 3 2H 120/240, 240 5,000 5,000 m 3 2M. 120/240. 240 5,000 5,000 d-c ratings max. voltage interrupting ratings U/L NEMA T features De-ion are chutes quick-make, quick-break thermal magnetic tnp adjustable magnetic tnp interchangeable tnp unit incl incl incl no no accessories or modifications 3 incl incl incl no no drawout frame magsebe tnp only non-automatic shunt tnp undervoltage trip auxiliary switch alarm twitch mechanical interlock field discharge contact center studa rear connecting studs ground current limiter reverse current tnp 575 toIt d-c ere chutes moisture-fungus treatment metor operator enclosure handle meckam parallel connection* handle lock devices ambient compensation no no no no no no no no no no no no no no add no no no add no no no no no no no no no no no no 0 no no add no no DO add no 'l Changed or added nn:e previous usue. T> On magnetic interrupters only. 'T- Single pole 15 and 20 imp ratings for 277/480 volt a-c circuits. 7 <!4 2"/ 120/240, 240 10,000 10,000 6 *v. *</% 3% 3H 120, 240/277 T. 5,000 7,500 | 10,000 Tl 10.000 ?i1 1 277, 480 10,000 10,000 600 10.000 240v 480v eoov 20.000 15,000 15.000 125, 125/250 5,000 5,000 Incl incl incl no no incl incl incl no no no no spec no no no no CO no add so no no spec add no add no add no add add no no no add add add add add add Not U /L listed. 2-pole unit supplied in 3-pole frame. 1 125 ! 5,000 ! 5,000 incl ! incl incl > no ! no no no . spec | add j no add 1 add 1 add 1 no ! add add 1 no ! n no add add add 1 add add add 250 5,000 10.0C0 250 10.000 10,000 r! incl 1 incl i iccl ^ ipc 3 i no ____1________________________________ no spec spec add add add add add no add and add r. o so and add and add add zo 21409 714.10 21411 AB De-ion circuit breakers i I amperes: 15 to 2000 maximum volts: 600 volts a-c 250 volts d-c descriptive bulletin 29-150 page 5 lj molded cases Moidarra $ and/or glass polyester cases combine built-in rugged ness and high dielectric strength in a compact design tbat is both space-saving and attractive. Mechanism is entirely enclosed providing maximum saiety. i| positive indication Position c: handle gives positive indication of whether circuit breaker ts on, off or tripped. terminals. Terminals suitable tor copper or aluminum cable are supplied as standard on 100 ampere breaker frames. Breaker frames rated 22S ampere and above are supplied with terminals suitable for copper cable only as standard. In these frames, terminals suitable for either aluminum or copper cables can be speciEed. De-ion arc quenchers This Westnghouse development consists of a series of grid plates mounted in parallel between supports of insulating material. The slots in the steel plates extend directly over the contacts and draw the arc from the moving contact up into tbe divided chamber. The arc is thus confined, divided, and extinguished in less than 'A cycle. On: Handle in this position indicates that the circuit is cicsed cr ca. tripped: When the breaker trips automatically due to overload or short circuit, the handle moves to a position midway between the manual on and off. off: Handle is in this position when circuit is open or off. To restore serv ice after automatic tripping, handle is first moved from center to off and then to on. H free bearing surfaces Bearing surfaces are cf dissimilar metals. This prevents bearing wear, allowing long service life. factory sealed Smaller breakers are sealed to prevent tampering and changing oi cahbrancn. In the XA. LA, MA, PA, HK, HLA and HMA frames the tnp are individually sealed and are interchangeable by removing the breaker cover. a accurate protection All tripping members have ground and polished latch surfaces and are heat-treated to prevent distortion. Heat-treated bi-metals retain calibration permanently. a firm connectors Pressure type connectors are standard with ail ratings above 30 amperes and make ethcient dependable connections. Quicklag and E nrame breakers rated 30 amperes or less have screw type silver alloy contacts on all breakers For increased contact life and enduring low resistance; special alloys prevent sticlring and welding. quick-make, quick-break mechanism The quick-make, quick-break over center toggle mechanism pro vides quick, positive action in opening and closing circuits. It prevents "teasing'' the contacts. electrically welded connections Firm, strong welded connections assure long life. Provide low resistance and low watts loss, with increased economy in operation. complete interpole barriers Completely isolate one pole from another, eliminate possibility c: phase-tc-phase flashover. common-trip Multi-pole units have insulated common-trip cj: that opens aJ poles when an overload occurs in any or.e phase. Mimmices possibility of single phasing. 21412 Im page 6 availability: EA through MA breakers availability: FA through PA breakers application Ambient compensating breakers provide a practically constant current rating over a 'vice range of temperatures and are thus suitable where unusually high, low or fluctuating temperatures are incountered. These breakers minimize the need for derating in ligher ambient temperatures. construction .das all the standard design features shown on pages 4 and 5. Ambient compensating breakers are calibrated at 25C. Howerer, due to a built in compensator these breakers will carTy approxi mately the same current at other ambients with a eery small ampere rating change. The trip units are thermally compensated ,o carry rated load at 50 :C while still meeting U/L tripping re quirements for 2o:C crashers at Z5=C. Ambient compensated oreakers do require sitgu: derating at ambients above 50C. These breakers ether fretn specthrady calibrated breakers, in that the latter do not utiltre compensators, but are specifically caliorated for the ambient :n which they are to be applied. application Magnetic only breakers are designed specifically lor short-circuit protection for use on systems where overload protection is provided by other means. This type breaker is not listed with Underwriters' Laboratories, Inc. constxuction Has all the standard design features shown on pages 4 and 5 except that it does not have a thermal trip element. front-adjustable magnetic trip Each breaker is calibrated at the factory for a specific trip range and set on the high side. Adjustment knobs located in the front cover can be adjusted downward to a specific requirement within the specified range. The adjustment knobs, made of red nylon, have 5 definite main setting positions and 4 mid-setting positions. The magnetic trip is so designed that each point follows a linear scale and each of the 9 settings has a significant value, within calibration tolerances. 21413 Saf-T-VaeSeaJter* ^ AB De-ion circuit breakers amperes: 15 to 2000 maximum volts: 600 volts a-c 250 volts d-c descriptive bulletin 29-150 page 7 w * ' ' < V; i availability: EA through MA breakers | application This breaker allows one to see whether the contacts are open or closed. Fills the needs oi industrial plants where safety codes require risible contacts as an additional safety precaution for maintenance personnel. ; construction i | Has all the standard design features shown on pages 4 and 5. Immediately over the arc extinguisher, a plastic type window is | inserted into the corer to permit easy viewing of the contacts, j Thus, by visual inspection it can he readily determined whether i the breaker is "ooea" or "closed". i I SaM-Vue'i transparent window is made of clear, heat-resistant i! thermcclastc--won't scorch or cloud on normal overloads. Available on thermal-magnetic, magnetic only and ambient j compensating breakers. Not available in the MARK 75 and ! TRI-PAC lines. availability: HF, HK, HLA and HMA breakers application The increased interrupting rating of this breaker makes it ideally suited for use in network systems, where high fault currents are available. Special calibration, ambient compensation and various attach ments are available in addition to the high interrupting capacity. construction Has all the standard design features shown on pages 4 and 5. The MARK 75 differs from the standard thermal magnetic breaker in that the construction provides improved performance that permits application on circuits that will deliver 75,000 amperes at 240 volts a-c. magnetic-only MARX 75 Types HF and HK MARK 75 magnetic-only breakers are not frontadjustable. Type HF is supplied with fixed magnetic trip setting only with trip set between 9 to 11 times nominal rating of breaker. Type HK is adjusted by removing the cover and adjusting the levers on the load side of the trip unit. Types HLA and HMA are front adjustable. Red adjustment knobs are located in the front cover and can be adjusted to spec-.hc requirements. 21414 @ page 8 j availability: TRI-PAC types F through L application The TRI-PAC breaker is essentially an AB De-ion circuit breaker incorporating a current-limiting device which enables it to be used on distribution systems where fault currents up to 100,(300 symmetrical rms amperes are available. As the name implies, it is a TRIple PACkage of protection--(1) time delay thermal trip, (2) instantaneous magnetic trip, and (3) current limiting pro tection--combined and coordinated in a single compact and economical device. TRI-PAC breakers are used on low voltage distribution systems when the available fault current is above the interrupting ratings of standard molded case breakers but dees not exceed 100,000 symmetrical rms amperes. They are designed for use in switchboards, control centers, panelboards, combination starters, bus duct plug-in units and separate individual enclosures. In addition, they are suitable for application as main breakers and for pro tection of branch and feeder circuits and connected apparatus. When prop erly applied, TRI-PAC breakers may also be used for the back up protection of standard molded case breakers. a 21415 AB De-ion circuit breakers amperes: 15 to 2000 maximum volts: 600 volts a*c 250 volts d-c descriptive bulletin 29-150 page 9 1 retain aU features of standard AB De-ion circuit breakers: TRI-PAC breakers are built to tbe same exacting design standards and by tbe same methods as conventional Westingbouse molded case circuit breakers. They retain all tbe features of standard breakers including: De-ion arc quenchers, nonwelding silver alloy contacts, common trip and Moldarta and/cr glass polyester cases. 1 compact, easy-to-remove current limiter housing: Current limiters are contained in a single, compact Moldarta-. bousing. It is front removable for easy access to current limiters when replacement is necessary. Limiters are correctly aligned and held in place by a retaining bar so that whan tbe bousing is pulled out all are disengaged from their receptacles simultane ously. Umiter housing safety interlock: When tbe limiter housing is removed a safety interlock trips tbe breaker before the limiter stabs disengage. Therefore, these terminals are never required to interrupt current This interlock also prevents closing of tbe breaker while tbe Umiter bousing is removed so that it is impossible to come in contact with "live" parts. visible disconnecting means: Removal of tbe limiter housing simultaneously removes tbe limiters. With the limiters removed U can be readily observed that tbe limiter contacts are open and that tbe circuit is disconnected. TM specially designed current limit* . ers: When a high fault current causes one or more limiters to function, a spring-loaded plunger is instantly ejected from tbe end of tbe limiter. The plunger strikes a trip bar which causes the breaker contacts to open the instant the fault occurs. An extended plunger on any limiter indicates, at a glance, on which phase tbe fault has occur:ed so that testing of limiters is unnecessary. Presence of an extended plunger also prevents relatching of the breaker. Thus, "good" limiters must be used or tbe breaker cannot be operated. These limiters are not affected by the overloads or normal short circuits cleared by the thermal-magnetic action of the breaker, and unless they have cleared a high fault current, as evidenced by an extended plunger, they may be used without question. Since these linr.ters are designed for use only with TRI-PAC breakers, safe, proper coordi nation is assured. TM coordinated com mon trip to prevent single phasing: When a current limiter operates, tbe ejected plunger causes instant release of a com mon tripping bar. All poles are opened simultaneously, eliminating tbe possibility of single phasing. TM positive trip indication: When a breaker trips, the handle always moves to the center "trip" position. In addition, the cause of tripping is indicated in the following ways: If tbe breaker cannot be reset immediately after tripping but can be reset after a short period it indicates thermal tripping due to an overload or high resistance fault. If it can be reset Immediately a "normal" fault current has been interrupted by instantaneous magnetic action. If tbe TRI-FAC cannot bo reset, high fault interruption by the current limiter has taken place. plng-in typo limiter terminals: Studs on each current limiter engage "tulip" type connectors in the breaker base. Since tbe limiter housing provides perfect alignment this arrange ment assures positive connection and easy removal of tbe limiters. H easy replacement oi limiters: Loosening of two screws releases a retaining bar in tbe limiter housing and permits removal of limiters. missing limiter interlock: This interlock, in the limiter housing, prevents the housing from being replaced unless all limiters are in place. Thus accidental single phasing is prevented, since the breaker cannot be reciosed when a limiter is missing. choice of three terminal connections: TRI-PAC breakers are available with front connected pressure type terminals, bolted rear-connected mounting studs and plug-in terminal mounting blocks. accessories: TRI-PAC breakers accommodate many standard AB breaker accessories including: shunt trip, undervoltage ta-ip and auxiliary contacts. Application of other accessories should be reviewed with Westinghouse. 21416 ? page 10 AB breakers are, for the most part, used in conjunction with ... or built into . . . other equipment such as panelboards, switchboards and numerous types of enclosures. Realizing that matched parts mean flexibility and time-saving assem bly for the builder, Westinghouse offers the following: Quicklag faceplate availability: Quicklag C For front panel mounting. Faceplate snaps over the front of the single-pole break er, is a two-piece wraparound on the two-pole breaker. handle locks: Various handle locks are available to prevent either accidental or deliberate operation of circuit breakers. The "trip free" handle of the AB De-ton circuit breaker enables it to trip on overload or short circuit conditions, even though handle locks are in place. ior Quicklag breakers Lockdog * availability all Quicklags--non-padlocking, removable padlock attachment availability all Quicklagspadiockahle, removable Quicklag front mounting inserts: avail ability: Quicklag C For front panel mounting. Self tap ping inserts screw into cover rivet holes of 2 and 3-pole Quicklag C breakers. Quicklag clamp availability: Quicklag C padlock device availability all 1 pole Quicklags padiockahle, non removable; meets requirements of California Code padlock device availability 2 and 3 pole Quicklag types P and B and QCC padiockahle, non-remov able; ' meets requirements of California Code Quicklag base mounting plate availability: Quicklag C Plates accommodate six single-pole, three two-pole or two three-pole breakers. Can be cut for specific need. for industrial breakers handle locks availability * EA through MA Padiockahle Unit meets require ments of California Code padiockahle non-padiockable handle ties standard availability: Quicklag P, B and C breakers For use with adjacent pairs of breakers which are not inter connected. Affords true trip indication, bars single-pole operation when double-poie manual switching is required. 21417 AB De-Ion circuit breakers --------- amperes: IS to 2000 maximum volts: 600 volts a-c 250 volts d-c descriptive bulletin 29-150 page 11 California type handle tie availability: Cuinkiags, EA and EH breakers To meet California code requirements, which call fcr a solid tie. plug-in kits availability: EA through MA, MARK 75 and TRI-PAC breakers terminal shields availability: EA through MA, MARK 75 and TRI-PAC breakers Westmghouse offers a complete line of formed terminal shields which fasten over rear terminal stuthde sline ends of AB breakers to protect personnel against accidental contact with availability: EA throuthgeh iMncAo,mMinAgRKwir7i5nga.ndMeTeRtI-mPAosCt ebrxeaacktienrgs safety requirements; e.g. for machine tool control panels where overload relays are internally reset. For adapting breakers tor switchboard and other rear-connected iccucancr.s. ci.ds can be used with standard breakers without any nchilirincn. EA and FA breaker studs are available tor mounting brea.-iars on insulated or steel panels. Studs tor larger b:ea<e:s are designed for use on insulated panels. Designed to provide quick and easy plug-in installation in switchboards. Tulip type connectors are buiit into the molded support block. Male studs are connected into breaker terminals. panelboard connecting straps availability: EA through MA, and MARK 75 breakers For connection oi breakers to bus bars in narrow cr convertible distribution panelboards. Straps and available panelboards parts are shown in price list 29-120 with individual breaker types. motor operators availability: EA through PA, MARK 75 and TRI-PAC breakers For complete remote operation oi circuit breakers. Means for manual cperatcn is provided in the event cl newer fail ure cr emergency. Available m 120, 208, 240, 480 volt a-c ratings. Motor operatcis are intended lor in frequent operation in line with V/'- en durance standards fcr mclcen case cir cuit breakers. 21418 page 12 ISESSSBiy mooate<f accessories and modifications 1 fMrViJ iiiW Jr. Fcr severe :: ---.usual operating conditions, fcr special iur.ctions or control sequences V.'esrmghouse breakers can be custom built or modified with special attachmer.os beyond the basic function of overcurrent and short-circuit pro tection, such special breakers meet modem, complex circuit requirements, and add flexibility of operation and efficiency. f?j T.n.s space is used only for very special modifications such as on 575 volt d-c breeders 'here standard arc chutes are replaced with special ones. Other see:.sliced breakers such as field discharge breakers and breakers with revstse current trips, which have only 2 switching poles, use one pole spa :e in tms area. 1 Th.s mounting space is used for mounting various attachments shown on opposite page. Standard attachment leads are 13 ' long and are brought cu- ;.de of breaker as shown. T.n.s mounting spare is used for mounting various attachments shown on occ-ts.te pace. Attachment leads car. be brought out rear of breaker as sc: m to: panelboard or other applications where space beside breaker ts . m.ted A.nachm.ent leads brought t-t rear of breaker must be specified. 21419 AB De-ion circuit breakers descriptive bulletin --------------------------------------------------------- 29-150 amperes: 15 to 2000 maximum volts: 600 volts a-c 250 volts d-c page 13 auxiliary switch availability: EA through PA, MARK 75 anti TRI-PAC breakers Shunt trips ire used to trip the breaker electrically from, a remote point. Shunt trip coils do not hi7e s continuous rating. A cut-oH switch is included to break the cod circuit when the breaker opens. A cut-eft switch is act provided in the EA breaker; therefore, the coil circuit must be broken by making connections to tbe load side of tbe breaker or using an auxiliary switch in a 3-pole breaker. Available for voltages up to 250 volts d-c and 600 volts a-c. Mounting location varies among breakers. Refer to pi 29-120 for specific locations. May be field installed in JA and larger breakers. Auxiliary switches are used to open or close control circuits as tbe breaker operates. These internally mounted switches are normally supplied in the form of miniature switches having 1A contact, IB contact and common. Type A contacts are closed when the breaker is closed and type B contacts are open when tbe break-' er is dosed. Mounting locations varies among breakers. Refer to pi 29-120 for specific locations. May be field installed in JA and larger breakers. Ii I alarm switch i availability: EH through PA, MARK 75 and TRI-PAC breakers ii ! llndervcltage tries are used to automatically trip tbe breaker when tbe line voltage drops below 40 to 6075 of normal. The breaker cannot be reset unrd voltage returns to 80% of normal. i Underrcitage trips are available for voltages up to and including 250 volts d-c and 600 volts a-c. For some voltages, a 10' or a 4* external resistor is supplied lor connecting in series with the trip cod. Only instamsneous action is offered. j j i ' Mounting location varies among breakers. Refer to pi 29-120 for specific iccancns. May be ieid installed in JA and larger breakers. These switches do not function with manual operation. When ice breaker is tripped, the alarm switch closes to energize an mnicatng light or sound an alarm. Switches which open on tripping can also be supplied when specified. Tlusrrincn at left shews position occupied. In right illustration com: cremates alarm sw-.tco in operating position. The alarm switch is c.aceti atop tbe tr.p trigger section and must be built-in at ice racrcr*/. .Alarm sw-.teces cannot be field installed. 21420 page 14 internally mounted accessories and' continued mechanically interlocked breakers Mechanical interlocks provide a means to interlock two breakers that only one mar be closed, yet both may be open at any given tiae. walking beam type availability: EH through MA, MARK 75 and TRI-PAC breakers Walking beam interlocks mount on panel at the rear of break ers. When one breaker is closed, a non-conductive plunger extends into the opposite breaker to prevent it from closing. The closed breaker must open before the open breaker may be closed. Circuit breakers require special machining to fit walk ing beam interlock and should be ordered from the factory with the necessary interlock. Refer to price list for standard breaker spacings. sliding bar type availability: EA through MA, MARK 75 and TRI-PAC breakers Sliding bar interlocks mount on panel in front of breakers. When bar is extended toward one breaker blocking handle in open position, opposite breaker can be closed. Closed breaker must be opened and handle blocked with sliding bar before opposite breaker can be closed. Breakers do not require alter ation for use with this attachment. Refer to price list for standard breaker spaangs. Kirk key interlock availability: EH through PA, MARK 75 and TRI-PAC breakers Kirk key interlocks mount directly to breaker cover. Plunger is extended by turning key in cylinder, thereby locking breaker in open position. Various keying arrangements can be supplied, (e.g.--key removable only when plunger extended; ke7 removable when plunger either extended or retracted; multi-cylinder oper ation of plunger). A pair of breakers, remote from each other, can be interlocked so that only one can be closed at one time, by using lerk key inter locks operable by the same key and key removable only when plunger is extended. These interlocks cannot be held mounted. 21421 AB De-ion circuit breakers ------------------------------- --------------- amperes: 15 to 2000 maximum volts: 600 volts a-c 250 volts d-c descriptive bulletin 29-150 page 15 dual voltage breakers availability: I through MA, anc MASK 75 breaker! For dual voltage equipment pro tection with only one trip rating, breakers may be supplied with center studs. At the maximum volt age the tip unit carries all the current. At the lower voltage, the current is doubled, with hall the current by-passing the trip unit through the center stud connec tions. Thus, one rating breaker can be used for both connections. Rear connecting stucs are normally used with center tap studs for line and toad connections. field discharge breakers availability: F, HX and HKL breakers Field discharge breakers are composed of 3-po!e frames having two outside non-automatic poles and a center pole field discharge contact arranged to close as the outside contacts are opened and vice versa. Thus, the center pole is used as a field discharge contact. Auto matic tripping can he supplied in out side poles if desired. reverse current breakers availability: 2-pole HK or HLM in 3-pole frame This internally mounted device is uses on d-c circuits :o open on a 10-15 per cent reversal c: current. Mounted in the right pole (positions 2 and 3 oi illustration or. peg* 12) are a reverse current .-e'.ay and s shunt trip actuates by this 3w.;ch. These breakers must be factory assembles. 575 volt d-c breakers availability: HK and HIM (3-pole frame only) For use on d-c circuits rated up to 575 volts. These breakers are similar to standard breakers except are equipped with special 575 volt d-c arc chutes. Breakers are supplied in 3 pole frame and should he wired with 2 poles in series on positive side of circuit and other pole on negative side. electrically-interlocked breakers availability: HX, HKL, HLM breakers Energising a rear-mounted relay will trip the breaker and prevent it* re-cloeure until relay is de-energized. Available as a factory modification. breakers with paralleled poles Breaker poles are paralleled for high current single-pole oper ation by the addition of straps at line and lead ends of breaker, as well as internal strap ahead of the trip, to assure an equal division of the load. For example, a 2-pole F breaker rated 100 amperes would have a single-pole rating of 200 amperes with paralleling straps. Parallel connections are made at factory and are available for types E through MA and MARK 75 breakers. Application of parallel poles should be reviewed with WestInghouse. breakers with series connections Series connection of breaker poles for single-pole high voltage operation can be made without any special parts. Application of series or poles should he reviewed with Weshnghouse. fungus-moisture proofing and Corrosion resisting availability: all AB breakers Breakers may be made to resist extreme moisture and fungus conditions found in tropical and other humid localities. Breakers are coated with a varnish; in addition, iibre parts are impreg nated and varnished to prevent moisture absorption. For chemical or heavy salt-laden atmospheres, where corrosion is accelerated, special platings and matena.s are available. V/ben ordering, these conditions should be scermcally outlined to assure best protecnon. 21422 descriptive thermal magnetic breakers Electrical circuits shall he protected by molded case AB De-ion circuit breakers, as manufactured by Weatinghouse Electric Corporation or approval equal. Each pole of these breakers shall provide inverse time delay overload protection and instantaneous short-circuit protection by means of a thermal-magnetic element. The minimum interrupting ratings of the circuit breakers shall be at least equal to the available short circuit at the line terminals. ratings shall be as follows: *7P maximum continuous amp* mudmaa olU i<e IA 100 EH 100 FA 100 TA KA 225 225 r.r. LA3 LA 400 400 r.r. MA 800 LT. ?A 2000 LT. 240 480 600 600 600 600 600 600 600 LT. iattch4ag#*il* txip Interrupting rating* (RMS asymmetrical amps) 2<0v a-c 480v a*c 600v a-c 250v d-c 7.500 15,000 20,000 25,000 30.000 50,000 50,000 50,000 150,000 10.000 IS.000 20,000 25.000 35,000 35,000 35,000 100,000 15,000 15,000 25,000 25,000 25,000 25,000 75,000 10,000 10.000 10.000 10.000 20,000 20,000 20,000 The breakers shall be operated by a toggle type handle and shall have a Quick-make, Quick-break overcenter switching mechanism that is mechanically trip free from the handle so that the contacts cannot be held dosed against short circuits and abnormal aments. Tripping due to overload or short circuit shall be clearly indicated by the handle automatically assuming a position mid-way between the manual "ON" and "OFF" positions. All latch surfaces shall be ground and polished. Breakers must be completely endosed in a molded ease. Noninterchangeable trip breakers shall have their covers sealed; interchangeable trip breakers shall have the trip unit sealed to prevent tampering. Ampere ratings shall be dearly visible. Contacts shall be of non-welding silver alloy. Arc extinction must be accomplished by means of De-ion arc chutes, consisting of metal gTids mounted in an insulating support. Terminals shall be listed with Underwriter Laboratories suitable for use with copper cable. Circuit breakers shall be listed with Underwriters'Laboratories, Incorporated, conform to requirements of NEMA Standards Pub lication No. AB 1-1959, and meet the appropriate classifications of Federal Specification W-C-375a. TRI-PAC breakers When the interrupting ratings of standard AB breakers are less than the available fault current of the distribution system, TRI-PAC breakers as manufactured by Westinghouse shall be used. These breakers shall be similar in construction to the standard Westinghouse AB breaker. On breakers with interchangeable, thermal, adjustable magnetic trip, the accessibility and position of the adjustment knob shall not be changed from those on the standard breaker. These breakers shall have continuous current ratings from 15 to 500 amperes; maximum voltage ratings of 600 volt a-c and 250 volt d-c; and interrupting ratings of 100,000 symmetrical rms amperes a-c and 100,000 amperes d-c. The breakers shall combine time delay thermal trip protection, instantaneous magnetic trip protection and current limiting protection in one complete assembly. The above protective actions shall be so coordinated that overcurrents will be cleared by the thermal action; short circuits of relatively low magnitude will be cleared by the magnetic action; and high fault currents above a predetermined point will be cleared by the current limiters. The current limiters shall not be affected when the thermal and/or magnetic trip function to clear the circuit Regardless of which tripping device serves to clear the circuit, all poles of the breaker shall open automatically. The breaker must not be resettable until current limiters which have functioned have been replaced. The current limiters shall have a visual means to determine which one has operated and requires replacement. The current limiters shall be mounted in a special housing, the cover of which shall be designed so that it is readily removable from the front All limiters are to be removed simultaneously when the limiters housing cover is removed. A "missing limiter inter lock" shall make reclosing of the breaker impossible when any current limiter is missing. The following means of electrical connections shall be available: 1. Front-connected pressure type terminals. 2. Plug-in terminal mounting blocks. 3. Bolted rear-connected mounting studs. prices: price list 29-120 application: application dita 29-150 dimensions: dimension sheet 29-170 Westinghonse Electric Corporation Standard Control Division: Beaver Plant Beaver, Pa. printed in U.S.A. 21423