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4129575550 ABB SERVICE PAGE 01

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Post-It� Fax Note To --y-0,., COJDept.IJv tJ TE� Phone 11

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HV MULTUMITE SWITCHG$ � IB-47620-HV ---�-.-Y�-/-�-o------�1 --�-��-----------------

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IB-47820

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I>ESCIUPTlON

ARC CHUTE ��(Opper) ::bs� (Lawm) ARCING COm'ACJ' (MoW>q) MAIN CONTACT QllsULATJNG LINE �LINXPIN OUTsiDE LlNX PIJI ADJT.ISTINQ IICI!tW Bt'I'AINING A.NQU: MANUAL TRn> BUTI'ON TRn> SHAFT SHUNT '1'RJP CONTROL PANEL GROUND CONNECTION SOLENOID r.n:clli\NlBM Ol'R\ATINC MECHANIS"f CONTACT AliM �RING 5PRINO W ASaEII llfliDGE PIVOT Pl!-; B�li SPruNG LOWUI STUD II!IIOCE MAIN CONTACT (SI<IIIc>ll.arf) RETA!lm(Q SCREW ( AidDg C<ll:ll= 11£TAINING SC!!EV.' (MG!n Co���actJ AJIC!NC OON'l'AC'r (Statloaary) BLOWOUT COIL PANE:L SlJP'POflt BLOWOUT IRON I'LATE AUXII.lAP.Y lll.OWOUT IRON PLATE

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DESCRIPTION

ARC CONTACT ARM CONTACT ARM PIVOT P1N

RAlr>G F: BAR .;f1!L(ST��-�c; :·.;c-·fc!'\.�':"· CONTACT ARM SPRING POST

CONTACT ARM SPRING

CONTACT PIN

BR!DGE PIVOT PIN

SPRING WASHER BRIDGE SPRING BRIDGE SPRING GUIDE

LINK

LINK PJN MAIN CONTACT (Moving l ARCING CONTACT ( Movillg) ADJUSTING NUT SET SCREW LOWER TERMiNAL CONTACT INSERT

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.03/24/2000 11:05 4129575550 ABB SERVICE PAGE 03

_HV __ M_UL __ TUM __ I_I_E_s_wn __ CH __ G_EAR ____ �' ��---------------�--47_6_20_-HV_ '

ported in the upper end of the bridges bars (3). The lower end is connected to two copper � ( 12). the lower ends of which ride on a flat si�ed

pin (7) capable of following their angular mofion

and supported by the bridge bars (3). A strbng

apring (6) also located between the bars q3), provides high pressure contact betwesn alllthe parts making up the cunttnt path. plus con�act pressure for the arcing contact (lS). The ttffec,ive

length of cunent· path below the pivot pin (2� is about twice that above it making a correspon�g difference in magnetic forc:es, providing a "bl?w· on" action for the arc contact ( 15).

'

Brtdqe and Contact Ann Ad.Juatm.euts. The \se­quence of contacts should be that all poles mcpre simultaneously. The arcing contact (15), Fig. \16, should lead the main contact (14) by 3/16 inph. When ne<:<sesuy this adjustment is :made by scr�w c 4). The main contact is provi�d with the pro�r pressure spring (6). No adjustment 18 required\ at

this fulcrum point. '1 I

The sc::rew ( 11 ), Fig. 14. at the outer end of the insulation connecting link ( 8) bas a right and l�ft hand thread. Adjustment. of bridge skid is mape with this screw. Essentially, the lower end of the bridge bars (25) should akld ll.ppro:Jimately ilh inch after the upper end of the bridge touch, whifb ahould make the bridge bars nearly parallel �th

the circuit breaker base. Tighten its set screw (riot shown) after making this adjustment.

On the bridge pivot pin (8). Fig. 16. are t.J,o

"Pring washer8 ( 9) held in place by adJusti!1-g nuts (IS). Tension of these nuts on spring washrr (9) should be such as to c:aWJe a slight preSSUfe

of the bridge bars ( 3) agairust the lower termin�l I contact inserts. Lock nuts in position by its a�t screw ( 17') after making this adjustment. I

The Blowout Structure is supported clll-eetly cin · I the back panel supports (31). fig. 14, and mount�d

directly above the main contacts. It cotlBi.sts of 1!a blowout coil ( 30) and its iron core.

The side blowout iron plate!$ (32) form rails sut" porting the arc chute ( l) which ia latched wheP

fully in place.

Awdliary blowout iron plates (33). Fig. 14. are attached to the 8Upport strips (2) and ( 4) on �cb. aide of the arc chute ( 1) and divert part of the blowout field to the vicinity of the contacts. The

blowout coU ( 30) is insulated for full qround poten­tial even though the blowout iron is well insulated from ground. The aegregation of the blowout struc­ture from the arc chute adds to simplicity and ease of handling.

The Arc Chute ( 1 ), Fig. 14, mounted above the contacts provides a positive and efficient arc inter­

ruption. It consists of insulation side walls. front

and back arc runner and a seri85 of ceramic plates,

mounted in spaced relation, traW5Verse to the arc

path, all in a strong magnetic blow-out field which forces the arc into the arc chute.

As the arc is driven into the chute by the mag·

netic field, it passes rapidly through the arc extin­guishing ceramic plates. They are rectangular in shape at the top and have a long tapered lower ·edge extending from the center of one side of the plat� to the lower comt:�r on the opposite side of the plate. A c:aramic spacer is. provided to support

each plate and position it with respect to adjacent plates and, with the long tapered surface of the plate, forms a triangular opening with the apex at the top for passage of the arc. Each plate with its spacer presents a decreasing area for the arc to occupy as it rises, and gradually squettzes it into a narrow slot.

The plates are assembled alternately in an inter·

leaved relation and spaced from each other so that the long taper&d surfaces cross at the center of the chute, directly above the path of tha arc as it travehl up the chute. � the arc passes this point it is forced into a zi<;J zag or 8i.nuous path which in· creases in length. This also brings it into contacr

with larger and larger cool surfaces of the platas.

Tha positive and efficient arc interruption is 8£­fected by the cooling lengthening and squeezing

of the arc in numerous points along its path. Provision for the interruption of low current area

is built into the arc c:hute. No moving pa.rts or

auxiliary equipment is necessary. Short circuit or

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PAGE 03 03/24/2000 11:05 4129575550 ABB SERVICE

' "'"

_HV __ M_UL __ Tcr.MITE _____ swrr __ _ CH __ G_EAR ____ ���----------------�-4_1_62_0-_HV_

ported in the upper end of the bridges bat11 �3). The lower end is connected to two copper links (12), the lower ends of which ride on a fiat si�ed pin (7) capable of following their angular moron

and supported by the bridge bars (3). A strong spring (S) also located between the bill's q3), provides high preesure contact betwesn all lthe I parts making up the cunent path. plws c:on�act preaaw-e for the arcing contact ( 15). The efiec�i ve

length of current path below the pivot pin (2) is I about twice that above it making a corre.sponding

difference in magnetic forctts, providing a "bl�w­on" action for the arc contact (15).

Brld.Qe and Contact Ann Ad.Juatm.euts. The i.fl&-1

quence of contacts should be that all poles mcike slmultaneously. The arcing contact (15). Fig. ;!16, should lead the main contact (14) by 3jl6 mph. When necessary this adjUl5tment is lllade by scr!lw ( 4 ). The main contact is provided with the p:ro:per preasure spring (6). No adjustment tg required! at this fulc.nun point.

The screw ( 11 ). Fig. 14. at thtt outer end of the insulation connecting link (8) has a right and lbft hand thread. Adjustment. of bridge skid ia mape

with this acrew. E.ssentially, the lower end of tpe bridge bars (25) should akid l!.pprorimately \1.4 inch after the upper end of the bridge touch, which ahould make the bridge bars nearly parallel with thtt ctrctrlt breaker base. Tighten its set screw (not

' :1 _ \ '�- •.no.Duq iliis · adlnatm...U: . On llie bridge pivot pm (8). fig. 16. are l11f0

�ling washers (9) held in plctce by adjmtuiq .nv.ts ( 18). TeDBion of these nuts o.n spring washbr (S) should be .such as to cause a slight preSSUfe of the bridge bars (3) aqam.t the lower tennin�l contact inserts. Lock nuts in position by its a�t screw ( 17) after making thia adjustment.

The Blowout Structure is supported cUl-ectly dn ·

the back panel supports (31 ). Fig. 14, and mounted

Auxiliary blowout iron plates (33). Fiq. 14. are attached to the support strips (2) and ( 4) on �ch side of the arc chute ( 1) and divert part of the blowout field to the vicinity of the contacts. The

blowout coil ( 30) is insulated for full ground poten­tial �;Wen though the blowout iron is well insulated from ground. The aegregation of the blowout struc­

ture from the arc chute adds to simplicity and ease of handling.

The Arc Chute ( l ), Fig. 14, mounted above the

contacts provides a positive and efficient arc inter­ruption. It consists of insulation side walls. front and bade arc runner and a series of ceramic plates,

mounted in spaced relation, tranBverse to the arc path, all in a strong magnetic blow-out field which forces the arc into the arc chute.

As the arc is driven into the chute by the mag­

netic field, it pa.sses rapidly through the arc extin­guishing ceramic plates. They are rectangular in. shape at the top and have a long tapered lower edge extending from the center of one side of the

plate to the lower comer on tht:t opposite aid& of the plate. A ceramic spacer is. provided to support

each plate and position it with respect to adjacent plates and. with the long tapered surface of the plate. forms a triangular opening with the apex at the top for paasage of the arc. Each plate with its. spacer presents a decreasing area for the arc to

occupy as it rises. and gradually squtteZes it into a n.a:r:row alot.

The plates are assembled a.ltemately in an inter· leaved relation and apaced frorn each other ao that the long tapered surfaces croas at the center of the chute, directly above the path of the arc as it traTefu up the chute. As the arc passeS this' point it is forced into a zig zag or sinuous path which in· creases in length. This also brings it into contact' with larger and larger coo! surfaces of the plates. The positive and t-:iilcien� c-.rc intern4ption iB ttf·

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