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Патент USA US2134565

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0a. 25, 1938.
M, G, LEONARD '
CIRCUIT BREAKER
2,134,565
Filed Oct. 9, 1936
29
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INVENTOR
2,134,565
. Patented Oct. 25, 19538
UNITED STATES PA
NT OFFICE
2,134,565
CIRCUIT BREAKER
Merrill G. Leonard, Sharon, Pa", assignor to
Westinghouse Electric & Manufacturing Com
pany, East Pittsburgh, Pa, a corporation; of
Pennsylvania
Application October 9, 1936, Serial'ltlo. HD4342
21 Claims, (Cl. 2llll===llllt°>l
My invention relates "to apparatus for inter
the circuit oi the are upon initial separating
ruptlug electrical circuits, in general, and more movement of the contacts.
'
'
'
particularly to circuit breaker structures of the
Another object of my invention is to provide
protective
which include one or more elec
a circuit breaker with'rneans for protecting the
tro~responsive trip devices for automatically ei
trip device thereof by immediately transferring 5
r‘ectirig
opening of the contact means or *the arc circuit formed incident to the separa—
the circuit breaker in response to predetermined tion of the contacts to an auxiliary contact not
overload conditions in the circuits controlled by included in the circuit of the trip device.
the breaker.
’
'
Another object of my invention is to provide
‘in circrdt breakers of the above mentioned
type, the electric-responsive device for e?ecting
opening of the contact means in response to
overload conditions usually consists of an elec~
tromagrietic or bimetallic device or both, con
nected
series circuit with the contact means
oi the breaker so as to be responsive to pre
iiiC-Eli?l‘?'lllléifi values of current ?owing in the
circuit controlled by the breaker. When such
a means for protecting the trip- device of a cir
cult breaker by transferring the arc circuit
10
formed incident to separation of the main con
tacts to an auxiliary contact not included in
the circuit of the trip device; in which the
auxiliary contact constitutes a part of the arc
extinguishing means.
The novel features that ‘i consider character
istic of my invention are set forth in particu
circuit breakers are installed for use in electri=
lar in the appended claims. The invention it
Ell cal systems, they are often called upon to inter~ '. self, however, both as to structure and opera
rupt circuits including highly inductive loads
and
often subjected to heavy overloads or
to short circuit conditions. in opening a circuit
breaker under such conditions, it is well known
' that current continues to ?ow tlierethrough
i’or
‘appreciable length of time after sep~=
aratioii oi‘ the contacts due to the formation
and persistence of an are at the contacts. Arc
extinguishing devices are usually provided for
extinguishing the are thus formed as quickly as
possible. in spite of the provision of such de
vices, however, the current continues to ?ow for
a length oi time sufficient in many instances to
damage or destroy the trip devices of the
35 '
breaker.
It is, therefore, the primary purpose of my
invention to provide circuit breakers of the
above-mentioned type with a means for pro
tecting the electro-responsive trip device or de
vices from are currents.
Another object of my inventlonyis to provide
a means for excluding the clectroqesponsive. trip
device of the circuit breaker from the circuit of
4
the arc- and contacts as soon as the contacts
start to open.
'
‘
Another object oi my invention is to provide
tlon, together with additional objects and ad
vantages thereof, will best be understood. from
the following detailed description, of speci?c em~
bodiments thereof when read in connection with
the accompanying drawing, in which:
25
Figure l is a vertical sectional view of a cir
brealrer embodying the features of my invention,
Fig. ,2 is a diagrammatic view illustrating». one
form of electrical connections for ‘the various
elements of the breaker _for carrying out the 30
purposes of my invention,
Fig. 3 is a diagrammatic view similar to Fig. 2
illustrating a slightly modi?ed form of appara
tus and electrical connections for carrying out
the purposes of my invention; and,
35
Fig. 4 is a plan view of the arc extinguish
ing device associated with the contacts of the
circuit breaker.
In the accompanying drawing, the invention
has been shown applied to one particular form
of circuit breaker structure embodying an elec
tro~responsive trip device and an arc extinguish
lng means of the spaced plate type. The partic
ular circuit breaker structure shown was selected
for illustrative purposes only and it will readily
appear from the following detailed description
Another object of my invention is to provide
that the invention is not limited in its applica
tion to any one particular circuit breaker struc
ture but thatit is capable of association with
any form of circuit interrupting device embody- 50.
for excluding the trip device of the breaker from
closed in the United States Patent No. 2.044.157, 5o‘
a circuit breaker with novel internal circuit con
nectlons for protecting the trip device of the
5 CD breaker Irom excessive currents.
mg an eleotro-responsive trip device and an arc
a circuit breaker having an arc extinguishing extinguishing device.
.
means with novel internal circuit connections
The circuit breaker illustrated in Fig. 1 is of
including a part of said are extinguishing means . the, same general'mechanical structure as dis
grasses?
2
granted to H. D. Dori‘man and John H. Shuler
and assigned to the assignee of this invention;
hence only a brief description of the same will
be given in this application.
Referring to Fig. 1, the base ‘I of the circuit
5
breaker is of molded insulating material and
has mounted in recesses provided therein the
end terminals 9 and H, a main stationary con
tact l3, a. movable contact- IS, the circuit breaker
10
operating mechanism indicated generally at H,
an electro~responsive trip device I9 and an arc
extinguishing means indicated generally at 2|.
An operating handle 23 also of molded insulat
ing material is provided for actuating the oper
15 ating mechanism ii. The trip device is is sup
ported on the base ‘i and positioned with respect
to the operating mechanism by means of two
suitable screws 25 (only the front screw being
shown) which engage threaded inserts 25 mold
20 ed in the base ‘i. These screws also serve to
connect the trip device in the internal circuit of
the breaker which will be described hereinafter.
The are extinguishing means and the operating
mechanism are secured to the base in any suit
able manner as for example by the screws 21
which extend through suitable openings therein.
A cover 29 of molded insulating material is pre
movably mounted on the base by means of bolts
(not shown).
The main stationary contact I3 is mounted on
30
a metallic plate 3! which will hereinafter be
termed an arc runner.
‘The are runner is se
cured to the base by any suitable means such
as one of the screws 21.
Both the movable and stationary contacts are
constructed of arc resisting material, the former
being composed of a silver molybdenum alloy
and the latter being composed of ?nely divided
silver. and graphite compressed into a conglom
40 erate mass. The are runner 3| may also be con~
structed of an arc resisting conducting material
similar to the stationary contact l3.
The movable contact |5 has a channel shaped
frame 33 which is pivotally supported on a U
45 shaped main frame 35 of the circuit breaker op
erating mechanism ll through the agency of a
pivot pin 3'1. The movable contact I5 is rigidly
a?ixed by means of a rivet to the free end of
a resilient switch arm 39 which is preferably con
50 structed of spring steel. The switch arm itself
is af?xed to the channel shaped frame 33 by
means of two other rivets.
The operating mechanism |'| comprises in gen~
era], the U shaped base or main frame 35, a
pair of toggle links 4| and 43 for actuating the
channel shaped frame 33 of the movable contact
IS, a releasable trigger 45 for restraining the
toggle links in an operative position, an operat
ing member 23, and a pair of overcenter springs
60 41 (only one being shown) for connecting the
operating member to the knee pivot of the toggle
links 4| and 43. The operating member 23 has
a bifurcated portion 49, the legs of which are
pivotally mounted on the sides of the main frame
6535 through the agency of pivot pins 5|. The
releasable trigger 45 is pivotally mounted at one
end to the sides of the main frame 35 by means
of a pivot pin 53 and has projecting portion 54
adapted to be normally engaged and held by the
trip device IS. The operating member 23 has a
hook portion 55 secured to the underside thereof
which is adapted to engage a shoulder 51 formed
on the trigger 45 for resetting the trigger after
the release of the same by the trip device. The
lower end of the toggle link 4| is pivoted to the
channel shaped frame 33 by means of/a pivot pin
55. The upper end of the toggle link 4| is piv
otally connected by means of the knee pivot pin
6| with the lower end of the toggle link 43, the
upper end of which is, in turn, pivotally con
nected to the trigger member 45 through the
agency of a piny53. The overcenter springs 41.
have their lower ends connected to the knee pivot
pin GI and their upper ends secured to lugs 64
formed on the underside of the bight of the
bifurcated portion 49 of the operating member
23. The trigger 45 provides a releasable restrain
ing means for holding the toggle links in an
operative position when the contacts l3 and I5
are engaged.
15
'
The movement of the trigger member 45 in a
clockwise direction is limited by a projection 85
which extends inwardly from one side of the
main frame 35. The limits of motion of the
bifurcated portion 49 of the operating member 20
23 are defined by the edges 61 of onset portions
of the side walls of the main frame 35. A han
dle portion of the operating member 23 projects
through a slot 69 provided in the cover 29.
The trip device l9 comprises a U shaped
current carrying bimetallic trip element 1|. A
latch plate 13 is mechanically fastened to the
upper end of the trip element l9 and insulated
therefrom by means of mica plates 15, the latch
plate being held in position by two spaced rivets 80
11 (only one being shown) which extend through
a retaining plate 19 and enlarged openings in
the top portion of the bimetallic trip element
itself. The trip element is supported upon its
own terminals 80 (only one being shown)
through the agency of rivets 18. The projecting
portion 54 of the trigger 45 is normally adapted
to be engaged under the lower edge of the latch
plate ‘I3 between the rivets 11.
The are extinguishing means 2| consists of 40
a plurality of spaced plates ill of magnetic mate
rial each insulated from the adjacent plates and
provided with a slot 83. The slots in the plates
are of substantially the same outline as the mov
able contact l5 and the position of the plates 45
is such that the slots form a path adapted to be
traversed by the movable contact IS in moving
into and out of engagement with the stationary
contact I3. The plates 8| are assembled be
tween two side walls 85 of insulating material.
Projecting lugs 81 are‘ provided on the plates II
for engagement in openings in the side walls 55.
when the movable contact l5 moves away from
its engagement with the stationary contact, to
ward open circuit position, an arc is drawn which 65
creates a magnetic ?eld surrounding the path of
the arc. The magnetic plates 8| so unbalance
the ?eld adjacent the are that the arc is moved
into the spaces between the plates where it is
quickly cooled and extinguished.
‘The plates
cause the arc to be immediately transferred from
the stationary contact l3 to the arc runner 3|
thus protecting the stationary contact from dam
age by contact with the arc. The are is split up
into a series of short arcs between the adjacent
plates 8|, the ?rst short are being immediately
established between the arc runner 3| and the
bottom plate of the stack.
The operation of the circuit breaker will now
be brie?y described. In Fig. 1, the breaker is 70
shown in the open circuit position with the trigger
or restraining member 45 in the set or latched
position in which it is held by the latch plate
13 of the trip element 1 I. The toggle links 4|—-43
are in their collapsed position.
It will be noted 75
3
2,184,565
that the trigger 45 is at all times biased in a
clockwise “direction by the reactionforce of the
overcenter springs ?l. Let it be assumed that
it is desired to manually close the circuit breaker.
The operating member 23 is moved from the po
sition shown in a clockwise direction about its
pivot pin 51%. Shortly before the operating mem
ber has reached the limit of its travel in a clock
wise direction, the line of action of the over~=
18 center springs t'l is brought to the right of the
center line of the toggle. This results in produc
ing a force which automatically moves the tog
gle links with increasing acceleration to their
overset position which effects movement of the
so m movable contact it to the closed circuit position
with a snap action.
counter-clockwise direction until its projecting
portion 54 reengages under the latch‘plate 13.
The breaker may then be closed manually‘in the
manner previously described.
The operating mechanism I1 is trip tree of the
operating member 23 in any position of the parts,
i. e., the movable contact l5 may be tripped to the
open circuit position irrespective of the position
of the operating member 23.
It'has been the practice in most circuit breakers 10
of the above-mentioned type to connect the
electro-responsive trip device or bimetallic trip
element in series circuit relationship with the
contact means of the breaker in order that the
device may respond to overload conditions. 15'
'When' the breaker having the aboveenientioned
connection is manually operated to open a cir;
cuit including a highly inductive load, or when
it is automatically opened in response to an alt
normally large overload or short circuit condi» 20
tion, the persistence of the are after the separa~
tion of the contacts may'result in damage or'de»
To open the contacts, the
operating member 23 is moved from its closed
circuit position in a counter-clockwise direction
about its pivot pin M to its open circuit position
shown in Fig. 1. Substantially the reverse action
takes place. The line of action of the over»
center springs is moved to the left of the center
line of the toggle which produces a force which ' struction of the trip device with the resulting
automatically ‘moves the toggle‘ links with in
loss of the safety feature in subsequent overloads.
creasing acceleration to their collapsed position
shown in Fig. l. ‘The collapsing of the toggle
The means for protecting the electro-respon 25
sive trip device from the damage indicated above
causes movement of the movable contact 05 to'itst will now be described.
open circuit position with a snapaction.
The electro~responsive trip device or the his
The bimetallic trip element ‘ii is adapted to nietal trip- elelnent the present disclosure is pro
be connected in series circuit with the contacts tected from abnormal current conditions by 30
of the breaker as will be described hereinafter. means of novel internal circuit connections for
‘W h the circuit breaker vin the closed circuit po
connecting the trip device in a certain circuit
sition; upon the occurrence of an overload con-w
relationship‘ with the terminals, contact means
tion of predetermined magnitude, the increased and a part of the are extinguishing means. In
3. loss
the bimetallic trip element results in one form of the invention, the connections are
the oroduction of sufilcient heat to cause that eie= made as follows: Referring to
2, a con
:ineut
deflect in a direction away from the op»
doctor
connects the load terminal to the rear
crating mechanism i 27. if the overload persists for
a s" cient length of time, this deflection be
terminal
of the bimetallic trio element 'Jl.
‘The forward terminal
of the trip element '0” i is
comes great
'ching
enough
engagement
to movewith
the the
latchprojecting
plate
the trigger
This unlatching oi
connected direct y to the are runner 3i and sta»
tionary contmt 5-3 by means of an insulated con
{it allows that member to rotate in a
e direction about its pivot
under
luence oi’ the reaction forces of the over
center springs ill’. almost immediately the upu
p
' of the toggle linlr :33 which
pivoted to
he
"S
Oger
by the pin
is moved a
ncient distance to the right of the center line‘ of
“vile toe'e‘le
innuenceol
to cause the
overcenter
toggle to collapse ill ex“
erting their tension on the knee oivot pin ill.
The channel shaped frame
is rotated about its
‘pivot
~
by the collapse of the toggle, thus
the movable contact ill to its open circuit
position with a snap action
the same manner
as desciihed for the manual operation,
Following the tripping operation and the re»
doctor
The movable contact
is connected
through the agency of the switch arm 539 with
an insulated conductor
which is, in
con
nected to the line terminal it of the circuit
breaker. The conductor
is electrically con»
nected to the'line terminal all by means of the
terminal
will be noted
connec“
that
= sciew
the connections
9!‘. (face Fig.
described
l.)
shove golace the o netallic trio ‘element ‘ll in
series circuit relationship with the stationary cone
tact it, the movable contact (I and the end
terminals 9 and ill of the circuit breaker when
the contacts are closed.
The insulated shunt
conductor
connects the
terminal
to 55 1
the bimetallic trip element ‘ll with the bottom
‘plate til oi the arc extinguishing means
The
conductors 9i and
are connected to the
sulting change-in position of the lrnee pivot pin
terminals of the bimetallic trip elen'lentv through
the operating handle 23 is biased in a
counter-clockwise direction but moves only to
the agency of the screws 25. The insulated con~ 60
a micl~position in the’ slot B9 of the cover 29.
This movement of the handle 23> to the mid-no
sition following the tripping operation serves as
a ready indicating means for showing that the
circuit has been opened‘in response to an ab
normal electrical condition.
~
doctor Ell is connected to the stationary contact
53 and are runner ill through the agency of a
screw 92 (see Fig. l) . A recess til is provided in
‘the base l of the circuit breaker for receiving the
insulated conductor wires M, 93 and 95 (see ‘Fig. 65
l). The operation of the breaker with the form
of connections described above is as follows:
The entire mechanism is resettable after a trip-=
With the contacts in the closed circuit position,
ping operation by movement of the operating ~ the'circuit through the breaker extends from the
member 23 to the full open circuit position as soon
‘line terminal ll through the conductor 93, the
as the bimetallic trip element, 'II has cooled suf- ' switch arm 39, movable contact l5, stationary
?ciently to restore the latch plate 13 to the
position shown in Fig. 1_. This movement causes
the hook portion 55 of the operating member to
engage and move the trigger member 45 in a
contact l3, insulated conductor 9|, vthe front ter—'
mine! so of-the bimetallic trip element ii, the ’
bimetallic trip element ‘H, the back terminal 82
of the trip element and the conductor 89 to the 75
2,184,566
‘H is excluded from the circuit of the are by
means of the insulated shunt conductor 95. The
are circuit then extends from the load terminal
9 through conductor 89 and the insulated shunt
conductor 95 to the end section 32 of the arc
load terminal a. If the movable contact I5 is
moved toward open circuit position either in
response to operation of the operating member
2a or in response to a tripping operation by
means of the bimetallic element 11,. an arc is
formed between the contact 53 and the movable
contact i". The are is immediately transferred
runner, through the stack of plates, the movable
contact I5, through the switch arm 39 and the
from the stationary contact i3 t0 the arc runner
insulated conductor 93 to the line terminal II.
It will be noted that in the embodiment shown
36 by the unbalanced magnetic ?eld caused by
10 the plates 8t. As has been previously described,
by Figs. 1 and 2, the bottom magnetic plate of
the arc extinguishing means constitutes, in effect,
an auxiliary contact to which the arc is trans
ferred upon initial movement of the movable
contact toward its open circuit position.
An important feature of the invention lies in
the arc is split up into a series of short arcs ex
tending between the plates 8! and between the
bottom plate 8i and the arc» runner 3!.
The
short are between the arc runner 3i and the bot
ha 01 tom plate
of the stack is sustained only by the
voltage drop across the bimetallic trip element
‘it This voltage is so low that the short arc be
tween the bottom plate 8% and the arc runner St
is immediately extinguished, thus excluding the
bimetallic trip element from the circuit of the
remaining are or arcs.
the fact that the current-responsive element is
shunted out of the circuit as soon as the moving
contact has moved only a short distance and
before it has moved to the full open position.
This removes the current-responsive element
from the circuit before it has time to heat up and
burn out. It is also advantageous that the cir
The arc circuit then em
tends from the load terminal 9 through the con—
cuit of my device does not require a connection
ductor
to the bottom plate 8! of the stack
though the arc in the space between the plates
to the movable contact l5 and through the con
doctor 98 to ‘he line terminal 5 i. It will thus be
seen that th
"metallic trip element is excluded
from the are‘ t or" the arcs as soon as the mov
to the top arc extinguishing plate which would
impress line voltage across the arc extinguisher
even when the circuit is open and would permit
a leakage current to ?ow if the ?bre side plates
of the arc extinguisher should become damp or
able contact moves a sui?cieht distance to estab
carbonized.
means.
Hence the arc current can have no dam“
effect on the bimetallic trip element.
the voltage drop across
e too
arc extinguishing means or are moving means,
bimetallic irip
more than one of the
'" plates could
included be
runner and the iii-metal connector
e invention are shown in
‘in T‘lg. -, the arc
is divided into ‘we
'
._
or 535?.
The insulated conductor
-nected to
back
-
of
bimetallic trip element '55 instead of being cc
Elected to the bottom magnetic plate 2% as in
(iii
_
While the invention has been shown associated 30
with a particular form of circuit breaker, it is
obvious that the invention is equally applicable
to any form of circuit interrupting device which
includes an electro~responsive trip device and an
lish
are e’ 'her between the stationary contact
and the bottom plate or ‘between the arc runne:
and ‘the bottom plate 35 of the
extinguishing
..
For example, the various forms of electro-respone
sive trip devices may be substituted for the U
shaped bimetallic trip element illustrated. The
trip device may be either in the form of a ther~
?nally responsive device or in the form of an elec 40
tromagnetic trip device. Likewise, various other
forms of arc extinguishing devices may be used.
The are extinguishing means illustrated is merely
selected for simplicity to illustrate the principle
of the invention. One particularly effective form
n. Cl
of arc extinguishing means to which the inven
tion applicable is disclosed in the United States
2, is connected to the end section B2 of the are
runner. All of ‘he other electrical connections
and elements are the same as the corresponding’
connections and elements shown in Figs. 1 and 2:
The operation of this modi?ed form of appa
ratus and circuit is similar in principle to the
embodiment shown in Figs. 1 and 2. When the
movable contact is in the closed circuit position,
Patent No. 1,963,643 granted to Benjamin P.
Baker and Maurice W. Brainard, and assigned to
the assignee of this invention.
the electro-rosponsive trip device or bimetallic
trip element
is connected in series circuit rela
tionship with the contacts i3 and i5 through
the following circuit: Line terminal H, insulated
conductor
switch arm 39, movable contact i5,
stationary contact i3, insulated conductor 3!, ‘ol
rnetallic tripv element ‘H, conductor 39 and load
While in accordance with the provisions of the
patent statutes, I have disclosed the foregoing
details of several embodiments of my invention,
it is to be understood that many of the details
are merely illustrative and that variations, in ad 60
dition to those mentioned, in their precise form
may be made without departing from the spirit
of the invention.‘ l desire. therefore‘ that the
terminal
As soon as the movable contact
starts to move to the open circuit position either
65 in response to a manual or a tripping operation,
the are formed at the contacts is transferred to
the extreme end section 32 of the arc runner ‘
by the unbalanced magnetic ?eld produced by
the plates at.
The end section 32 of the arc
runner constitutes, in effect, an auxiliary contact
It will thus be seen that I have provided a novel
means associated with a circuit interrupting de
vice oi the protective type for protecting the
electro-responsive trip device thereof from dam
age by the arc current.
language of the accompanying claims shall be
accorded the broadest reasonable construction. C; Cl
and that my invention be limited only by what
is explicitly stated in the claims and by the prior
art.
I claim as my invention:
1. A circuit interrupting device comprising
to which the arc is transferred as soon as the . switch contacts. electro-rcsponsivc means {or ef
movable contact starts to move to the open circuit
position. As soon as the arc is transferred to the
end section 32 of the arc runner, the electro~
75 responsive trip device or bimetallic trip element
i'ecting separation of said contacts connected in
circuit therewith, arcing plates to which the are
between the contacts is transferred, and means
for shunting the arc current around said electro
2,134,665“ 1
responsive means and one of. said contacts to one
of said‘ arcing plates upon initial opening move
ment of said switch contacts.
2. A circuit interrupting device comprising
switch contacts, electro-responsive means for ef
fecting separation oi’ said contacts connected in
circuit therewith, arcing plates, means including
said plates for e?ecting transfer of the are from
said contacts to said plates and connections
10 rendered operable by transfer of the are for ex=
5
of the movable contact to the open circuit posi
tion in response to a predetermined condition, an
auxiliary contact, means for excluding said de
vice from the circuit of the arc and for trans
ferring the arc to said auxiliary contact upon
initial movement of said movable contact toward
open circuit position.
8. A circuit breaker comprising a stationary
contact and a movable contact between which an
eluding said electro-responsive device from the
arc'is drawn, an electro-iresponsive trip device 10
connected in the circuit leading to the stationary
circuit of the are as soon as said contacts have
separated a small part of their total distance of .
arc extinguishing means including a series of
separation.
contact for e?ecting opening of said contacts, an
spaced notched plates of magnetic material for
circuit hreaker comprising a stationary transferring the are from said contacts to said
contact, a movable contact, electro-responsive plates and a connection for excluding said de
means for e?ecting movement of the movable vice and said stationary contact from the circuit
contact to open circuit position connected in cir
of the are upon movement 0:? the movable contact
cult with said contacts, means including a series , toward open circuit position.
of spaced plates of magnetic material for trans»
9. In a circuit breaker the combination of
ierring the are formed incident to the opening switch contacts, electroc-responsive means con
oi the contacts from the contacts to said plates nected in circuit with said contacts for effecting
and for extinguishing the same, and a connec“ separation ‘of said contacts in response to prede
tion completed by the are for excluding said elec= termined conditions and means for excluding the
N (21 tro~responsive device from the circuit of the arc
electro-responsive, device from the circuit of the
during the ?rst part of the movement of said are formed incident to separation of the con
movable contact toward open circuit position.
tacts, said means being operable in response to
Acircuit breaker comprising switch con“ the initial separating movement of the contacts.
tacts, electrwresponsive means connected in clr~
iii. in a circuit breaker the combination of
till cult with said contacts for ‘effecting opening‘ oi’ switch contacts, a thermal bimetallic device in
contacts in response to predetermined con
circuit with said contacts for effecting separation
ditions, means including ‘a series of spaced plates or‘ said contacts in response to predetermined
of magnetic material for effecting transfer of the conditions, and means for excluding the thermal
are formed incident to the opening of said con» bimetallic device from the circuit of the are
tacts from the contacts to said plates,v and means formed incident to the separation of said cone
operable by transfer of the are for excluding the tacts, said means losing operable in response to
electrc-responsive device from the circuit oi‘ the the separation of said contacts and as soon as
are upon the initial opening movement oi’ said said contacts have separated a small part of
contacts,
,
their total distance of separation.
circuit breaker the combination of a
so
ii. In a circuit breaker the comhination of
stationary contact, a movable contact, an electron line and load terminals, a stationary ‘contact, a
movable contact connected to said line terminal,
15
a _.t of the movable cont-act to the open circuit
position in response to] predetermined conditions,
an arc extinguishing device comprising an are
ill
connected to the stationary contact and a
alits/ oi‘ spaced notched plates or" magnetic
material for transferring
are formed inci
lt to theopening oi‘the contacts from said
contacts to said are runner
said plates, a
connection from said electro-o'esponsive device
to one of said plates nearest said stationary con
means comprising an
circuit with said contacts for effecting
movement of the movable contact to open circuit
position in‘response to a predetermined magni-a -
35
of the :contacts from the stationary contact to
completed by the transfer of the arc to said are
runner for excluding said electro-respcnsive de~
nected
30
runner connected to
the circuit of the are as soon as said inov==
fused and a movable contact between which an
25
said stationary contact and a series of notched‘ 50
spaced plates oi’ magnetic material for e?ecting
transfer of the are formed incident to separation
said are runner and said plates and ‘a connection
so arc is drawn, an electro~responsive device con~=
20
an electro-responsive device having one terminal
thereof connected to the load terminal and its
other terminal. connected to said stationary con
tact for effecting movement of the movable con
tact to open circuit position in response to pre—
determined conditions, an arc extinguishing
tact i'cr excluding said electro-responsive device
aisle contact has moved a small part of its total
movement to the open circuit position.
A circuit interrupting device comprising a
15
vice from the circuit of the are as soon as the
movable contact has moved a small part or" its
total movement toward open circuit position.
12. In a circuit breaker the combination of
line and load terminals, a stationary contact, a
movable contact connected to said line terminal,
an electro-responsive device having one terminal
tude of current, means including a plurality oi’ \ thereof connected to the load terminal ‘and its
65 arcing plates of magnetic material for e?ecting other terminal connected to said stationary con 65
transfer of the are from said contacts to said tact for shooting movement of the movable con
plates, and a connection from said electro-re-= tact to open circuit position in response to prede
- sponsive device to one of said plates for excluding termined conditions, an arc extinguishing means
said device from the circuit of the are upon initial comprising an arc runner connected'to said sta
movement of said movable contact toward open tionary contact and a series of notched spaced
70
circuit position.
‘
'
plates of magnetic material for effecting transfer
'7. A‘circuitibreakcr comprising a stationary‘ vof the are termed incident to separation of the
and a movable contact between which an arc is contacts from the stationary contact to said arc
drawn, an electro-responsive device connected in runner and said plates and a connection from the
circuit with said contacts for effecting movement load side of said electro-responsive device to one 75
2,134,565
of said plates for excluding said device from the
circuit or" the are upon initial movement of said
movable contact toward open circuit position.
13. In a circuit breaker the combination or“ line
and load terminals, a stationary contact, a mov
able contact connected to one of said terminals,
17. In a circuit breaker the combination of line
and load terminals, a. movable contact connected
to the line terminal, a stationary contact, a bi
metallic means having one terminal connected to
the load terminal and its other terminal con
tact for effecting movement of the movable con
tact to open circuit position in response to pre
determined conditions, an arc extinguishing
position in response to predetermined condition,
nected to said stationary contact for e?ectlng 10
movement of said movable contact to open circuit
means comprising an arc runner connected to
an arc extinguishing device comprising a divided
said stationary contact and series of notched
arc runner having one section thereof connected
transfer of the are formed incident to separa
tion of‘ the contacts from the stationary contact
to said arc runner and said plates and a conduc
tor connecting the first mentioned terminal of
20 said device to the plate nearest
arc runner
for excluding said device from the circuit of the
arc as soon as said movable contact has moved
a smal1 part or" its total novernent toward open
circuit position.
In
circuit breaker the combination of
line and load terminals, a stationary contact, a
movable contact connected to
line terminal,
a bimetallic device having one terminal thereof
connected to the
terminal and its other
terminal connector. to said stationary contact for
effecting movement of the movable contact to
open circint position in response to predetermined
guishin: mews compris
35
open circuit position.
an electro-responsive device having one terminal
thereof connected to the other terminal and its
other terminal connected to said stationary con
spaced plates of magnetic material for effecting
NJ GI
tion of the arc runner for excluding said electro
responsive means from the circuit of the are upon
initial movement of said movable contact toward
an arc runner
contact
series
r
magnetic
spaced plates
transfer of the
are formed incident to separation of the contacts
from
static;
*7 contact to said are runner
and said plates
connection for excluding
’
It oi the
ma]. movement
toward open circuit po
to the stationary contact, the other section 15
thereof insulated therefrom, o. plurality of notched
spaced plates of magnetic material for effecting
transfer of the are formed incident to separation
of the contacts from said stationary contact to
the insulated section of the arc runner and to 20
said plates, and a connection from the ?rst men
tioned terminal of said bimetallic means to said
insulated section of the arc runner for excluding
said means from.the circuit of the are as soon
as said movable contact has moved a. small part of 25
its total movement toward open circuit position.
18. In a circuit breaker the combination of a
stationary contact, a movable contact, an electro
responsive device normally connected in circuit
with said contacts for e?ecting movement of the
movable contact to open circuit position in rc—
spouse to predetermined overload conditions, an
auxiliary conducting member to which the end of
the are established on the stationary contact is
transferable
means i or excluding said electro— 35
responsive device
m the circuit
the are upon
transfer of the end of he s c from t re stationary
contact to
conducting member.
a circuit breaker the combination of a
stationary contact,
device connected
movable contact, a. bimetallic 40
oil
with he stationary
contact for efiecl
'
contact to open
15. .L.contacts,
circin'ta
device
combination
circuit
v
’
the contacts
from the circuit
transferring the "'
' . ?uent to separa—
to an auxiliary c "tact and a conductor con»
nected to said
' coo. act for excluding said
me are as soon as said con
tacts have separated a small part ct their total
'
combination of
line and load term'nals, a movable contact con.
nected to the line tc.minal, a stationary contact,
an electro-responsive means having one terminal
device from the circuit of the are immediately
after said movable contact has moved a small
distance toward open circuit position.
20. In a circuit interrupter, the combination of
a stationary contact, a moval is contact, an
electro-responsive device normally connected in
circuit with said contacts, a plurality of conduct
ing members into which the are drawn between
said contacts is movable, and one 01 said con
connected to the. load terminal and its other
terminal connecte to said stationary contact for
eiiecting movement of said movable contact to
open circuit position in response to predeter
mined condition, an arc extinguishing device
ducting members nearest said stationary contact
being connected to provide a shunt circuit around
said electro-responsive element upon contact of
theme therewith.
comprising a divided arc runner having one sec
switch contacts, electronresponsive trip means
connected in circuit with said contacts for effect
ing separation of said contacts in response to
predetermined conditions, and means including
tion thereof connected to the stationary contact,
the other section thereof insulated therefrom, a
plurality or‘ notched spaced plates of magnetic
material for effecting transfer of the are formed
incident to separation of the contacts from said
stationary contact to the insulated section of
the arc runner and to said plates, and a connec
tion from
first mentioned terminal oi said
electro-responsive some" to said insulated sec~
m. CH
smid stationary contact
.eterz. 'ned con
the separation of
in a circuit breaker
response to
predetermined
tion of the contact~
e2" losing the bimetallic device
distance of separation.
‘ overnent of the movable
g separation of
circuit completed
39
21. In a circuit breaker the combination of
an electrical connection completed by the are
formed incident to the separation 01' said con
tacts for excluding the electro-responsive means
from the circuit of the are upon initial separating 70
movement of the contacts.
'
MERRIIL G. LEONARD.
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