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Патент USA US2117261

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May 10, 1938.
H. THOMMEN
ELECTRIC CIRCUIT BREAKER
Filed July :50, 1937
nâwww5»,..
2,117,261
Patented May 10, 1938
2,117,261 ,
UNITED STATES PATENT OFFICE
2,117,261
ELECTRIC CIRCUIT BREAKEB
`Hans Thommen, Baden, Switzerland, assignor to
Aktiengesellschaft Brown Boveri & Cie., Baden,
lîv‘vliâlerland, a Joint-stock company of Switzer
App'umiï; .my 3o, 1937, serial No. 156,554
190lalms.
This invention relates in general to circuit
breakers, and more particularly to breakers of
the iiuid blast type in which means are provided
for inserting a resistor in the circuit to be opened
5 by the breaker to‘ thereby facilitate interruption
of the arc therein.
It is well known to provide circuit breakers with
contacts controlling the insertion of a resistor
in the circuit to be opened by the breaker to re
10 duce the current intensity in the arc and hence
facilitate the interruption thereof.
In circuit
ing chamber of the circuit breaker illustrated in
Fig. 1 taken on a plane parallel to the plane of
projection utilized in Fig. 1;
Fig. 3 is a vertical cross s_ection through a modi
iied embodiment of the arcing chamber of the cir- 5
cuit breaker diiïering from the embodiment i1
lustrated in Fig. 2 in the use of a fixed hollow
auxiliary contact forming a discharge passage for
the arcing chamber; and
Fig. 4 is a vertical cross section through a fur- -l0
breakers of the fluid blast type, and particularly
ther modified embodiment of the arcing chamber
differing from the embodiment .illustrated in
in circuit breakers of the gas blast type, it has
Fig. 3 in the use of a movable auxiliary contact.
been found that the size of the resistor may be
Referring more particularly to the drawing by
characters of reference, Fig. 1 illustrates a cir- 15
15 considerably reduced and that the action of the
gas blast in extinguishing the arc may be con
cuit breaker comprising as a constructive element
siderably improved by substituting an arrange
thereof a reservoir 6 containing fluid under pres
ment of coaxial contacts formed as solids of revo
sure.
lution in place of the usual rectangular contacts,
other suitable insulating fluid, but steam may
also be used under certain operating- conditions. 25
Reservoir 6 may be connected with the arcing
chamber 1 of the circuit breaker through a hol
low insulator 8 and through a suitable valve (not
shown) which may be controlled by an overload
relay 9 mounted on a projection III of the wall of 30
-chamber 1 forming one terminal of the breaker.
2 Ul and by utilizing a radial blast rather than a lat
eral blast for blowing out the arc. As an inter
mediate step in the operation of the breaker, the
fluid blast causes transfer of the arc established
between the arcing contacts from one of such con
30 tacts to an auxiliary contact coaxial therewith
to introduce the resistor into the circuit. 'I'he
fluid blast may also serve to dissipate the heat
evolved in the resistor and the resistor may ac
cordingly be placed in a discharge passage from
35
July 30, 1936
(Cl. 20o-146)
the arcing chamber.
It is, therefore, one of the objects of the present
invention to provide a circuit breaker of the ñuid
lblast type in which a blast of fluid under pres
sure is utilized to transfer an arc from an arc
40 ing contact to an auxiliary contact for inserting
.a resis‘tor in the circuit controlled by the breaker.
, ÍAnother object of the present invention is to
' v.provide a circuit breaker oi the fluid blast type
"in’which an arc is transferred from one contact
t to another contact coaxial therewith by means of
a radial blast of fluid.
Another object of the present invention is to
provide a circuit breaker of the fluid blast type in
which a blast of fluid having served to transfer
50 an arc to a contact inserting a resistor in the cir~
cuit of the breaker is utilized for cooling the re
sistor.
Objects and advantages other than those
above described will be apparent from the follow
55 ing description when read in connection with the
accompanying drawing, in which:
Fig. 1 is a-view, in side elevation, of a circuit
„
Reservoir 6 also supports an insulator I I on which
is mounted the pivot for the movable blade I2
of a disconnecting switch cooperating with the
arcing contacts of the circuit breaker as will 35
appear hereinafter. Switch blade I2 may be
actuated by any suitable mechanism such as a
compressed ñuid motor I3 of the reciprocatory
type connected therewith through a pair of con
necting rods I4, a T-shaped crank I6 and a con- 40
necting rod I5 of insulating material. It will be
understood that the elements of the circuit
breaker may be duplicated and provided in suit- able number when the breaker is to be used for
controlling the iiow of 'current through a plurality 45
of conductors.
As shown in detail in Fig. 2, chamber 1 is of
cylindrical form having a wall preferably made
of conductive material provided with a circular
port or orifice I1 coaxial with the bore of the 50
chamber.
'I'he lip of the wall of chamber 1 about orifice
I1 may be provided with a flange to form an an
nular fixed contact I8 but it is generally pre
ferred instead to arrange about the oriñce a 55
replaceable annular contact of suitable refractory
breaker embodying the features of the present in
vention;
Such ñuid may be compressed air or any
_
so ' Fig. 2 is a vertical cross section through the arc
conductive material such as tungsten. A tubular
movable contact I9 is supported within chamber
1 and coaxially therewith by means of a piston 21
arranged for reciprocatory movement within a oo
2
2,117,261
cylinder 22. Cylinder 22 is insulated from the
wall of chamber 1 by a lining 23 which thus in
sulates contact I9 from contact I8 when such con
tacts are separated. Although contact I9 may be
made in one piece it is generally preferred to pro
vide such contact with a renewable arcing por
tion 24 adapted to engage contact I8 in abutting
relation therewith and with another renewable
arcing portion 2'6 to which the arc is to be trans
ferred by a blast of i'luid under pressure. Con
tact portions 24 and 26 may also be made of re
fractory conductive material such as tungsten.
Contact I9 is generally maintained in abutting
engagement with contact I8 by suitable resilient
means such as a spring 21 acting between con
tact I8 and a diaphragm 28 closing the upper
end of cylinder 22. Diaphragm 28 is provided
with apertures for admitting fluid under pres
sure from chamber 1 into cylinder 22 to actuate
20 piston 2| and contact 29 and thus separate con
tacts I9 and I8.
The stroke of contact I9 is
limited by abutment of the enlarged portion
thereof against a cylinder 25 mounted on dia
phragm 28 and also serving as guide for con
25 tact I9. Piston 2| is provided with suitable pro
jections on which are fastened a pair of resili
ent contacts 29 adapted to engage switch blade
I2 to form a disconnecting switch serially con
nected with arcing contacts I8 and I9. Piston
30 2| is also provided with an aperture arranged
in alinement with the bore of contact I9 to form
with such bore an auxiliary discharge passage
for chamber 1.
'
Chamber 1 is provided with an inlet 3| through
35 which fluid under pressure may be introduced to
cause operation of piston 2|. Chamber 1 is also
provided with a main discharge passage 32 com
Resistor 31 may be made of any suitable known
material such as silicon carbide and is chosen
of the proper size to obtain the desired amount
of resistance and to form a structure capable
of carrying the required amount of current with
out undue heating. Resistor 31 is insulated from
the space within passage 32 by means of a suit
able insulation jacket 38.
The circuit breaker is inserted in the circuit
to be controlled thereby by connecting one ter 10
minal of the circuit to the support of blade I2
and connecting the other terminal of the cir
cuit with terminal I0 either directly or through
a relay 9. When the circuit breaker is closed,
the elements thereof are in the position shown 15
in Figs. l and 2. When the circuit is to be opened
by operation of the circuit breaker, a connection
is established between reservoir 6 and insulator
8 either manually or by the action of relay 9
to admit fluid under pressure from reservoir 6 20
into insulator 8 and chamber 1. Orifice I1 then
being closed by contacts I8 and I9, the pressure
of the fluid within chamber 1 and within cylin
der 22 rises to a value sufficient to cause down
ward movement of piston 2|. Piston 2| sepa
rates contact I9 from contact I8 and brings con
tact I9 into abutting engagement with the up
per end of guide 25, and such operation causes
an arc to be established between contact I8 and
30
portion 24 of contact I9.
The connection between reservoir 6 and cham
ber 1 is maintained for a sufficient length of time
to cause projection of a blast of iluid under pres
sure from chamber 1 through orifice I1 into pas
sage 32 and between the convolutions of baille
34 to the ambient atmosphere while another
ñuid blast is projected through the bore of hol
municating with the chamber through oriñce I1, ' low contact I9. When vanes 33 are provided,
such vanes impart a whirling motion to such
and the flow of fluid from chamber 1 into pas
40 sage 32 may be given a whirling movement by
means of helical vanes 33 arranged within the
portion of chamber 1 adjacent contact I8. Pas
sage 32 may be of cylindrical shape arranged
to form an extension of chamber 1 and serves to
45 confine the fluid blast projected from chamber
1 through orifice I1 upon separation of contacts
I8 and I9. Passage 32 is preferably provided
with a suitable structure for deionizing and cool
ing the fluid issuing from chamber 1, for sepa
50
rating therefrom metallic particles detached by
the arc from the arcing contacts and for muf
Íllng the report produced by the fluid blast. Such
structure may consist of a sheet metal baille 34
wound to form a spiral convolute surface defin
55
ing a spiral path issuing-fromgpassage 32 along
a generatrix line of the wall thereof.
An auxiliary contact 36 is arranged outside of
chamber 1 within passage 32 and extends into
orifice I1 axially thereof. Contact 36 preferably
60 protrudes into chamber 1 to an extent such that
when contact I9 is removed from the position
shown to the fully open position at a predeter
mined distance from contact I8, portion 26 of
contact I9 is brought to a lesser distance from
65 contact 36. Contact 36 is supported in position
by Aa resistor 31 arranged outside of chamber
1 in passage 32 >and fastened to the upper part
of the wall of passage 32 in any suitable known
manner such as by clamping. Contact 36 is con
70 nected through resistor 31 with one of the arc
ing contacts of the circuit breaker. 1n the em
bodiment illustrated in Fig. 2 such connection
comprises the conductive wall of passage 32 and
the wallof chamber 1, whereby contact 36 is con
75 nected with contact I8.
fluid blasts. The two fluid blasts jointly occupy 40
the annular space contained between contacts I8,
I9 and 36 wherein the fluid flows in a generally
radial direction. The arc established between
contacts I8 and I9 is thereby urged radially in
ward towards contacts 26 and 36, and the volt
45
age drop in the arc is caused to increase by the
lengthening thereof and by the deionizlng effect
of the iluid blast. On the contrary, the gap be
tween contacts 26 and 36, »which is illled with
fluid in a highly ionized condition, requires a
gradually decreasing voltage for the establish
ment of an arc therein by dielectric breakdown.
When such voltage becomes lower than the
voltage drop in the arc established between con
tacts I8 and I9, the arc is transferred from con
tact I8 to contact 3B. It will be understood,
however, that when the circuit breaker is con
nected in an alternating current circuit, such
transfer of the arc may take place during the
first half cycle of arcing or else an apparent 60
transfer of the arc may be eiîected by extinction
of the arc between contacts I8 and I9 during
passage of the arc current through zero and sub
sequent ignition of another arc between contacts
26 and 36 at the beginning of the following half 65
c cle.
yAfter such transfer the flow of current through
the circuit breaker takes place from terminal I Il
through the wall of passage 32, resistor 31, con
tact 36, contact 26, 24, I9, contact 29, and switch
blade I2 to the other terminal of the circuit
breaker. Resistor 31 causes the arc current flow
ing between contacts 26 and 36 to have a much.
lower value than the current previously flowing
between contacts I8 and I9 with the result that
3
2,117,261
the arc is readily extinguished by the blast of
ñuid projected from chamber 1 through the bore
of contact I9. It will be understood that the
blast projected through contact I9 is of rela
tively low intensity compared to the blast pro
jected through passage 32 and that therefore
the fluid ionized and heated by the arc estab
lished between contacts 26 and 36, issues from
contact I9 in a relatively cold and deionized con
10 dition. Such blast will accordingly not cause
arcing over from contact 29 and switch blade
I2 to chamber 1 or to other adjacent conductive
members.
-
The insertion of the resistor in the circuit
15 causes the latter to assume a generally resistive
character with the result that any oscillation
tending to be established therein by the exchange
of energy between the inductive and capacitive
portions thereof are damped, and hence the re
,20 covery voltage impressed across the contacts is
limited to the voltage generated at the source
supplying the circuit. In addition to the above
actions, the space about contacts I8, I9 and 36
is swept by a blast of cold fluid in an un-ionized
25 condition so that establishment of another arc
between the contacts is prevented._ Such fluid
blast also serves to dissipate the heat produced
in resistor 31 by the ñow of current therethrough.
After extinction of the arc, switch blade I2 may
30 be disengaged from contact 29 by operation of
motor I3 to insert, in the circuit, a gap of sufii
cient length to permanently maintain the circuit
open. 'I'he supply of fluid from reservoir 6 to
chamber 1 may then be discontinued and con
tact I9 is returned to the position shown under
the action of spring 21.
In the embodiment illustrated in Fig. 3, con
tact 36 is replaced by a tubular contact 39
mounted on a hollow resistor 4I. The circuit
40 breaker may then be provided with a solid mov
able contact 42 instead of hollow contact I9.
Contact 42 may, however, be provided with a hol
low arcing portion 43 whereinto contact 39 may
penetrate when contact 42 is in the closed posi
tion. In the present embodiment, when fluid
under pressure is introduced into chamber 1 a
part of the fluid blast projected ‘through orifice
I1 upon separation of contacts >I8 and 42 is
diverted through contact 39 `and resistor 4I for
,50 causing transfer of the arc from contact I3 to
contact 39. The operation of the present em
bodiment is otherwise identical tov that of the
embodiment illustrated in Fig. >2.
In the embodiment nlustrated in Fig. 4, thel
ñxed auxiliary contact is replaced by a movable
tubular auxiliary contact 44,slidable within in
sulator 38 and within resistor 4I. Contact 44 is
adapted to engage a solid arcing portion 46 of
contact 42 and is urged into engagement there
60 with by a spring 41. The movement of contact
44 is, however, limited by engagement of a
flange 45 thereof with the lower portion of the
wall of resistor 4|. Spring 41 may be arranged
within resistor 4I and maintained in position
65 therein by means of an insulation tube 48.
Current is preferably transmitted between con
tact 44 and resistor 4I by means of a sliding
contact 49 clamped on resistor 4I.
In the present embodiment, when fluid under
'pressure is admitted into chamber 1 contact 42
is urged downward as in the embodiment illus
trated in Fig. 3._ During the iirst part of the
stroke of contact 42, contact 44 is maintained in
engagement Vwith arcing portion 46 of contact
75 42 by spring 41. 'I'he flow of current between
chamber 1 and contact 42 is then divided be
tween two parallel paths. Part of such current
ñows from the wall of chamber 1 through con
tact I8 and therefrom to contact 42 through the
arc established therebetween upon separation
thereof. Another portion of such current flows
from the wall of chamber 1 through the wall of
passage 32, resistor 4I, contact 49, contact 44,
and contact portion 46 to the body of contact 42.
When contact 42 reaches a predetermined posi 10
tion, flange 45 engages the bottom of the wall of
resistor 4| and causes contact 44 to stop. Con
tacts 44 and 42 accordingly separate and the arc
established between contacts I8 and 42 is trans
ferred by the iiuid blast from contact I8 to con
tact 44 which is in close proximity to arcing por
tion 46 of contact 42. The operation of the
present embodiment is otherwise identical to
that of the embodiment illustrated in Fig. 3.
Although but a few embodiments of the present 20r
invention have been illustrated and described, it
will be apparent to those skilled in the art that
various changes and modifications may be made
therein without departing from the spirit of the
invention or from the scope of the appended 25
claims.
It is claimed and desired to secure by Letters
Patent:
l. An electric circuit breaker comprising an
arcing chamber having an orifice, an annular 30
fixed- contact arranged about said orifice, an
auxiliary contact arranged outside of said cham
ber and extending into said orifice, a resistor
arranged outside of said chamber and connect
ing said fixed contact with said auxiliary con
tact, a movable Contact arranged within said
chamber, and means for actuating said movable
contact.
2. An electric circuit breaker comprising an
arcing chamber having an orifice, a discharge 40
passage for said chamber communicating there
with through said orifice, an annular ñxed con
tact arranged about said orifice, an auxiliary
contact arranged within said passage, a movable
contact arranged within said chamber, a re
sistor arranged outside of said chamber and con
necting said auxiliary contact with another one
of said contacts, and means for actuating said
movable contact.
-
3. An electric circuit breaker comprising an
arcing chamber having an orifice, a discharge
passage for said chamber communicating there
with through said orifice, an annular'fixed con
tact arranged about said orifice, an auxiliary
contact arranged within said passage, a movable
contact arranged within said chamber, a resistor
arranged outside of said chamber and connect
ing said auxiliary contact with another one of
said-contacts, means for actuating said movable
contact, and means fo'r projecting a blast of 60
fluid under pressure from said chamber through
said orifice upon separation of said fixed and
movable contacts.>
4. An electric circuit breaker comprising an
arcing chamber having an orifice, a discharge
passage for said chamber communicating there
'with through said orifice, an annular fixed con
tact arranged about said orifice, an auxiliary
contact arranged within said passage, a movable
contact arranged within said chamber, a resistor 70
arranged outside of said chamber and connecting
said auxiliary contact with another one of said
contacts, means for actuating said movable con
tact, means for projecting a blast of fluid under
pressure from said chamber through said orifice 75
4
2,117,261
upon separation of said fixed and movable con
tacts, and means for imparting a whirling motion
to said fluid blast through said orifice.
5. An electric circuit breaker comprising an
arcing chamber having an orifice, a discharge
passage for said chamber communicating there
with through said orifice, an annular fixed con
tact arranged about said orifice, an auxiliary
Contact arranged within said passage, a movable
contact arranged within said chamber, one of
said auxiliary and movable contacts being hollow
and forming a second discharge passage for said
chamber, a resistor arranged outside of said
chamber and connecting said auxiliary contact
with one of said ñxed and movable contacts,
means for actuating said movable contact, and
means for projecting a blast of fluid under pres
sure from said chamber through said passages
upon separation of said nxed and movable con
20 tacts.
6. An electric circuit breaker comprising an
arcing chamber having an oriñce, a discharge
passage for said chamber communicating there
with i.irough said orifice, an annular fixed con
tact arranged about said orifice, an auxiliary
contact arranged within sai-d passage, a movable
contact arranged within said chamber, a resistor
arranged outside of said chamber and connecting
said auxiliary contact with another one of said
30 contacts, means for separating said fixed and
movable contacts to thereby establish an arc
therebetween, and means for projecting a blast
of fluid under pressure from said chamber
pressure from said chamber through said orifice
upon separation of said fixed and movable con
tacts to transfer the arc established therebetween
from said fixed contact to said auxiliary contact.
10. An electric circuit breaker comprising an
arcing chamber having an orifice, an annular
fixed contact arranged about said orifice, an aux
iliary contact arranged outside of said chamber
and extending into said orifice, a resistor ar
ranged outside of said chamber and connecting
said fixed contact with said auxiliary contact, a
movable contact arranged within said chamber
in contacting engagement with said fixed contact,
means for actuating said movable contact where
by said movable contact is removed to a prede
termineddistance from said fixed contact and to
a lesser distance from said auxiliary contact, and
means for projecting a blast of fluid under pres
sure from said chamber through said orifice upon
separation of said fixed and movable contacts to 20
transfer the arc established therebetween from
said ñxed contact to said auxiliary contact.
ll. Ari electric circuit breaker comprising an
arcing chamber having an orifice, an annular
fixed contact arranged about said oriñce, an aux
iliary contact arranged outside of said chamber
and extending into said oriñce, a resistor ar
ranged outside of said chamber and connecting
said ñxed contact with said auxiliary contact, a
tubular movable contact arranged within said
chamber, means for separating said fixed and
movable contacts, and means for projecting a
blast of fluid under pressure from said chamber
through sai-d orifice upon separation of said fixed
through said orifice and through said movable
and movable contacts to transfer the are estab
lished therebetween from said another one of
able contacts.
said contacts to said auxiliary contact.
7. An electric circuit breaker comprising an
arcing chamber having an orifice, an annular
40 nxed contact arranged about said orifice, an aux
iliary contact arranged outside of said chamber
and extending into said oriñce, a resistor ar
ranged outside of said chamber and connecting
said fixed contact with said auxiliary contact, a
movable contact arranged within said chamber,
means for actuating said movable contact, and
means for projecting a blast of fluid under pres
sure from said chamber through said oriûce upon
separation of said fixed and movable contacts.
8. An electric circuit breaker comprising an
arcing chamber having an oriñce, an annular
ñxed contact arranged about said orifice, an aux
iliary contact arranged outside of said chamber
and extending into said orifice, a resistor ar
55 ranged outside of said chamber and connecting
'said fixed contact with said auxiliary contact, a
movable contact arranged within said chamber,
one of said auxiliary and movable contacts being
hollow, means for separating said fixed and mov
60 able contacts, and means for projecting ablast
of fluid under pressure from said chamber
through said orifice and through said hollow con
tact upon separation of said fixed and movable
contacts.
9. An electric circuit breaker comprising an
65
arcing chamber having an orifice, an annular I
fixed contact arranged about said orifice, an aux
iliary contact arranged outside of said chamber
and extending into said orifice, a resistor ar
ranged outside of said chamber and connecting
said fixed contact with said auxiliary contact, a
movable contact arranged withinsaid chamber,
means for separating said fixed and movable con
tacts to thereby establish an arc therebetween,
75 and means for projecting a blast of fluid under
contact upon separation of said fixed and mov
l2. An electric circuit breaker comprising an
arcing chamber having an orifice, an annular
fixed contact arranged about said orifice, a tubu
lar auxiliary contact arranged outside of said 40
chamber and extending into said orifice, a re
sistor arranged outside of said chamber and con
necting said fixed contact with said auxiliary
contact, a movable contact arranged within said
chamber, means for separating said fixed and 45
movable contacts, and means for projecting a
blast of fluid under pressure from said chamber
through said orifice and through said auxiliary
contact upon separation of said fixed and mov
able contacts.
13. An electric circuit breaker comprising an
arcing chamber having an orifice, an annular
fixed contact arranged about said orifice, a mov
able contact arranged within said chamber in
contacting engagement with said fixed contact,
an auxiliary contact arranged outside of said
chamber and extending into said orifice, a re- ,
sistor arranged outside of said chamber and con
necting said fixed contact with said auxiliary
contact, means for urging said auxiliary contact 60
into engagement with said movable contact,
means for .limiting the movement of said auxil
iary contact, -means for actuating said movable
contact whereby said movable contact is removed
to a predetermined distance from said fixed con
tact and to a lesser distance from said auxiliary
contact, and means for projecting a blast of fluid
under pressure from said chamber through sai-d
orifice upon separation of said fixed and movable
contacts .to transfer the arc established therebe 70
tween from said fixed contact to said auxiliary
contact.
14. An electric circuit breaker comprising an
arcing chamber having an orifice, a discharge
passage for said chamber communicating there 75
5
2,117,261
with through said orifice, an annular ñxed con
tact arranged about said orifice, an auxiliary
contact arranged within said passage, a movable
contact arranged within said chamber, a resistor
arranged within said passage and connecting said
auxiliary contact with another one of said con
tacts, means for actuating said movable contact,
and means for projecting a blast of fluid under
pressure from said chamber into said passage
upon separation of said fixed and movable con
tacts.
15. An electric circuit breaker comprising an
arcing chamber having an orifice, a discharge
passage for said chamber communicating there
with through said oriñce, an annular fixed con
tact arranged about said orifice, an auxiliary con
tact arranged within said passage, a movable
contact arranged within said chamber, a resistor
arranged within said passage and connecting said
20 auxiliary contact with said fixed contact, means
for actuating said movable contact, and means
for projecting a blast of’ fluid under pressure
from said chamber into said passage upon sepa
~ ration of said fixed and movable contacts.
16. An electric circuit breaker comprising an
25
arcing chamber having an orifice, an annular
fixed contact arranged about said orifice, an aux
iliary contact arranged outside of said chamber
and extending into said orifice, a resistor ar
30 ranged outside of said chamber and connecting
said fixed contact with said auxiliary contact, a
movable Acontact arranged within said chamber,
means operable by fiuid under pressure within
said chamber for separating said fixed and mov
35 able contacts, and means for introducing fiuid
under pressure into said chamber to cause op
eration of said contact separating means and to
cause fluid under pressure to be projected from
said chamber through said orifice.
17. An electric circuit breaker comprising an
40
arcing chamber having an orifice, a discharge
passage for said chamber communicating there
with through said orifice, an annular fixed con
tact arranged about said orifice, an auxiliary con
tact arranged within said passage, a movable
contact arranged within said chamber, a resistor
arranged outside of said chamber and connecting
said auxiliary contact with another one of said
contacts, means operable by fluid under pres
sure within said chamber for separating said fixed
and movable contacts, and means for introducing
fluid under pressure into said chamber to cause
operation of said contact separating means and
to cause fluid under pressure to be projected from 10
said chamber through said orifice.
18. An electric circuit breaker comprising an
arcing chamber having an orifice, a discharge v
passage for said chamber communicating there
with through said orifice, an annular fixed con 15
tact arranged about said orifice, an auxiliary con
tact arranged within said passage, a movable
contact arranged within said chamber, a resistor
arranged within said passage and connecting said
auxiliary contact with another one of said con
tacts, means operable by fluid under pressure
within said chamber for separating said- fixed
and movable contacts, and means for introducing
20
iiuid under pressure into said chamber to cause
operation of said contact separating means and 25
to cause fluid under pressure to be projected from
said chamber through said orifice.
19. An electric circuit breaker comprising an
arcing chamber having an orifice, a discharge
passage fqr said chamber communicating there 30
with through said orifice, an annular fixed con
tact arranged about said orifice, an auxiliary con
tact arranged within said passage, a movable
contact arranged within said chamber, a resistor
arranged within said passage and connecting said
auxiliary contact with said fixed contact, means
operable by fluid under pressure within said
chamber for separating said fixed and movable
contacts, and means for introducing fiuid under
pressure into said chamber to cause operation 40
of said contact separating means and to cause
fluid under pressure to be projected from said
chamber through said orifice.
HANS THOMMEN.
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