Title of Invention

AN ELECTRICAL SWITCHING APPARATUS

Abstract An electrical switching apparatus comprises a load terminal (15) and a line terminal (13); a pair of main contacts (17); a separable pair of arcing contacts (63) ; and a moving conductor assembly (23) having a contact carrier (29) mounted for movement between an open position and a closed position to open and close the separable pairs of contacts (17,63). The apparatus further comprises an arc chute (83) and an arc runner (45) electrically connected to a stationary arcing contact (61) and extending toward the arc chute (83) to provide a path for an arc struck between the separable pair of arcing contacts (17,63) as the separable pair of arcing contacts open with movement of the moving conductor assembly (23) from the closed position. The arc runner (75) has a longitudinal elongated raised ridge (97) generally laterally centered.
Full Text Field of the Invention
This invention relates to electrical switching apparatus having an arc runner,
which transfers the arc from separable contacts, such as arcing contacts, to an
arc chute where the arc is extinguished.
Background of the Invention
Electrical switching apparatus for power distribution systems include devices
such as, for instance, circuit breakers, network protectors, transfer switches and
disconnect switches. Power circuit breakers are typically used to connect a power
distribution network to a power source. Such power circuit breakers must be able
to withstand high currents for a period of time without tripping to give circuit
breakers in the network time to respond and isolate the fault thereby localizing
disruption of service. Thus, by the time the power circuit breaker responds, it
may have to interrupt a sizable current. This results in the drawing of an arc as
the circuit breaker contacts open. It is known to provide an arc chute adjacent to
the opening path of the circuit breaker contacts. The arc chute is constructed of
a number of spaced apart plates extending transverse to the arc. As the contacts
open, the arc is transferred by electromagnetic forces to the arc plates, which
cool the arc and increase the arc voltage by breaking it up into sections, both of
which help to extinguish the arc.
It is known to employ an arc runner to drive an arc from a stationary contact to
an arc chamber. See U.S. Pat. No. 4,229,630.
Typically, an arc is formed on the arcing contact and travels across a joint to the
arc runner. At low currents, the electromagnetic force on the arc may not be
adequate to force the arc to cross this joint. One end of the arc may remain on
the stationary arcing contact, severely eroding the contact. If the arc does not
move onto the arc runner it will not reach the arc chute in time for the breaker
to interrupt.
U.S. Pat. No. 5,969,314 discloses an air circuit breaker with multiple movable
arcing contacts, in which an arc runner is employed above an integral stationary
arcing contact in order to provide a surface for the arc to run toward the
of the arc chute. This elongates the arc, divides it among the arc plates and
cools the arc gases, thereby extinguishing the arc and interrupting current flow.
The arcing contacts at the center of the arc chamber part last when the circuit
breaker opens, causing the arc to form in the center of the arc runner. When the
arc is created on the stationary arcing contact, it is more likely to travel along a
sharp edge or corner of the part. A longitudinal vertical slot is disposed into the
center of the arc runner in order to provide an attractive edge for the arc to
travel toward the center of the arc chute. The edge of the slot encourages the
arc to travel up the center of the arc runner, engaging the arc chute near the
center and extinguishing the arc sooner. However, this center slot is no more
attractive to the arc than the outside edges of the arc runner.
The arc may be attracted to the laterally extending edge of the stationary arcing
contact instead of the slot in the arc runner. At higher voltages and lower current
levels (e.g., as encountered in single-pole interruption testing for IEC
certification), the arc has less electromagnetic drive to enter the arc chute and is
more difficult to interrupt. The arc may run to one edge of the stationary arcing
contact. This may prevent the arc from running up the arc runner. The arc may
move to one side of the arc chamber and be less likely to enter the arc plates,
possibly resulting in failure to interrupt.
OBJECTS OF THE INVENTION
There is a need, therefore, for electrical switching apparatus with an improved
arrangement for extinguishing arcs generated during current interruption.
There is a more specific need for such an improved arrangement for directing
the arc from the stationary arcing contact into an arc chute.
There is a still more specific need for such an improved arrangement for
attracting the arc to the center of the arc runner and providing an improved path
for the arc to follow to the center of the arc chute without stalling or wandering
toward the sides of the arc chamber.
SUMMARY OF THE INVENTION
These needs and others are satisfied by the invention, which is directed to
electrical switching apparatus in which a circuit breaker arc runner includes a
longitudinal elongated raised ridge. The elongated raised ridge is preferably
positioned directly above the location of arc formation and provides a
prominence for concentrating electrical charge. This structure holds the arc in
the center of the arc runner by providing the shortest path for the arc. The
elongated raised ridge also provides a smooth elevated path that the arc follows
up the height of the arc runner into the center of arc chute.
As one aspect of the invention, an electrical switching apparatus comprises:
a load terminal and a line terminal; at least one pair of separable contacts
electrically connected between the load conductor and the line conductor;
an operating assembly adapted for movement between an open position
and a closed position to open and close the separable contacts;
an arc chute positioned adjacent the separable contacts; and
an arc runner electrically connected to one of the separable contacts and
extending toward the arc chute to provide a path for an arc struck between the
separable contacts as the separable contacts open with movement of the
operating assembly from the closed position, the arc runner having a longitudinal
elongated raised ridge generally laterally centered.
The stationary arcing contact and the arc runner may comprise an electrically
conductive member having a base surface in contact with the line terminal, a
stationary contact surface forming the stationary arcing contact, and a runner
surface leading toward the arc chute.
Preferably, the raised ridge includes a raised portion above the runner surface
and a tapered portion which descends to a position proximate a surface between
the stationary contact surface and the runner surface. The tapered portion may
be above the stationary contact surface.
Alternatively, the raised ridge may include a raised portion above the runner
surface and a tapered portion which descends to the stationary contact surface.
The tapered portion may be flush with the stationary contact surface.
Alternatively, the raised ridge may include a raised portion above the runner
surface and a proud portion, which protrudes above a surface between the
stationary contact surface and the runner surface and above the stationary
contact surface.
Alternatively, the raised ridge may include a raised portion above the runner
surface and a tapered portion, which descends to a position which is offset from
the stationary contact surface. The position, which is offset from the stationary
contact surface, may be a position on the runner surface.
Preferably, the stationary contact is integral with the arc runner, thereby
eliminating a joint therebetween.
As another aspect of the invention, an electrical switching apparatus comprises:
a load conductor and a line conductor; a pair of main contacts including a
movable main contact and a stationary main contact, and a separable pair of
arcing contacts, including a movable arcing contact and a stationary arcing
contact, the stationary main contact and the stationary arcing contact being in
electrical contact with the line conductor; an operating assembly electrically
connecting the movable main contact and the movable arcing contact to the load
conductor, the operating assembly adapted for movement between an open
position and a closed position to open and close the separable pairs of contacts,
and also adapted for transitioning from closure of both the pair of main contacts
and the separable pair of arcing contacts, to closure of only the separable pair of
arcing contacts while the pair of main contacts are opened, to opening of the
separable pair of arcing contacts in the open position thereof; an arc chute
positioned adjacent the operating assembly; and an arc runner electrically
connected to the stationary arcing contact and extending toward the arc chute to
provide a path for an arc struck between the separable pair of arcing contacts as
the separable pair of arcing contacts open with movement of the operating
assembly from the closed position, the arc runner having a longitudinal
elongated raised ridge generally laterally centered.

As a further aspect of the invention, an electrical switching apparatus comprises:
a housing;
a load conductor and a line conductor mounted in the housing;
a pair of main contacts including a movable main contact and a stationary
main contact, and a separable pair of arcing contacts, including a movable arcing
contact and a stationary arcing contact, the stationary main contact and the
stationary arcing contact being in electrical contact with the line conductor;
a moving conductor assembly electrically connecting the movable main
contact and the movable arcing
contact to the load conductor and comprising a contact carrier mounted for
movement between an open position and a closed position to open and close the
separable pairs of contacts, at least one contact finger pivotally mounted on the
contact carrier and having the movable arcing contact adjacent a free end and
the movable main contact spaced from the free end, and contact spring means
pivotally biasing the at least one contact finger to move from closure of only the
pair of main contacts with the carrier in the closed position, to closure of both
the pair of main contacts and the separable pair of arcing contacts, to closure of
only the separable pair of arcing contacts while the pair of main contacts are
opened, to opening of the separable pair of arcing contacts as the carrier moves
to the open position; an arc chute positioned adjacent the moving conductor
assembly; and an arc runner electrically connected to the stationary arcing
contact and extending toward the arc chute to provide a path for an arc struck
between the separable pair of arcing contacts as the separable pair of arcing
contacts open with movement of the moving conductor assembly from the closed
position, the arc runner having a longitudinal elongated raised ridge generally
laterally centered.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
A full understanding of the invention can be gained from the following
description of the preferred embodiments when read in conjunction with the
accompanying drawings in which:
FIG. 1 is a vertical section through a circuit breaker incorporating the arc runner
of the invention shown in the fully closed position.
FIG. 2 is similar to FIG. 1 but showing the contact fingers about to break contact
at the arcing toe.
FIG. 3 is similar to FIG. 1 but showing the contact carrier in the fully open
position.
FIG. 4 is an isometric view of the arc runner of FIG. 1.
FIG. 5 is a side view of the arc runner of FIG. 4.
FIGS. 6-8 are views similar to FIG. 5, but show arc runners in accordance with
alternative embodiments of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is applicable to electrical switching apparatus such as, for example,
circuit breakers, network protectors, transfer switches and disconnect switches
having separable contacts,, and will be described as applied to a power circuit
breaker having main and arcing contacts.
FIGS. 1-3 illustrate a power air circuit breaker 1 having a housing 3 which
includes a molded front casing 5 and a rear casing 7 which together define pole
chambers 9 each containing a pole device 11. Typically, the circuit breaker 1 has
three poles, one for each phase in a three-phase system. FIGS. 1-3 are vertical
sections through one of the pole chambers 9 taken along slightly different lines
to show the pertinent features.
Each pole includes a line side conductor or terminal 13 which projects out of the
rear casing 7 for connection to a source of alternating current (AC) electric
power (not shown). A load conductor or terminal 15 also projects out of the rear
casing 7 (see FIG. 2) for connection typically to the conductors of a load network
(not shown).
Each pole device 11 has a pair of main contacts 17, which include a stationary
main contact 19 and movable main contact 21. The movable main contact 21 is
carried by a moving conductor assembly 23. This moving conductor assembly 23
includes a plurality of contact fingers 25 which are mounted in spaced axial
relation on a pivot pin 27 secured in a contact carrier 29. The contact carrier 29
has a molded body 31 and a pair of legs 33 (both legs 33 are shown in FIG. 3)
having pivots 35 rotatably supported in the housing 3 (FIG. 3). In the closed
position (FIG. 1), a circuit is completed from the line conductor 13 through the
closed main contacts 17, the contact fingers 25, flexible shunts 95 and the load
conductor 15 (see FIG. 2).
As best seen in FIG. 3, the contact carrier 29 is rotated about the pivots 35 by a
drive linkage 37 which includes a drive pin 39 which is received in a transverse
passage 41 in the carrier body 31 through a slot 43 to which the drive pin 39 is
keyed by flats 45. The drive pin 39 is fixed on a drive link 47, which pivots in a
groove 49 (FIGS. 1 and 2) in the carrier body 31. The other end of the drive link
47
Is pivotally connected by a pin 51 to a pole arm 53 on a pole shaft 55 similarly
connected to carriers in the other poles of the circuit breaker 1. The pole shaft
55 is rotated by an operating mechanism, shown schematically at 57, mounted
on the front of the front casing 5 and enclosed by a cover (not shown).
A movable main contact 21 is fixed to each of the contact fingers 25 at a point
spaced from the free end of the finger. The portion of the contact finger 25
adjacent the free end forms a movable arcing contact or "arc toe". The
stationary arcing contact 61 which together with the arc toe 59 forms a pair of
arcing contacts 63 and is provided by the exemplary integral arcing contact and
runner 65.
The moving conductor assembly 23, drive link 47 and operating mechanism 57
form an operating assembly 66 adapted for movement between an open position
and a closed position to open and close the main contacts 17 and the arcing
contacts 63.
Although an exemplary operating assembly 66 is disclosed for movement
between an open position and a closed position to open and close the separable
contacts 17,63, the invention is applicable to any suitable operating assembly for
opening and closing separable contacts, such as, for example, an operating
assembly which moves the exemplary contact fingers 25 to open and close
separable contacts.
As best seen in FIG. 4, the integral arcing contact and runner 65 is an electrically
conductive member having a base section 67 with a plurality of slots 68 and a
base surface 69, an arcing contact section 71 having an arcing contact surface
73, and a runner section 75 having a runner surface 77. In the preferred
embodiment, the integral arcing contact and runner 65 is a sheet metal member
made of copper or steel plated with nickel, copper or other suitable material. The
integral arcing contact and runner 65 is mounted on the line conductor 13 by a
bolt 79 which extends through a support block 81, one of the slots 68 of the
base section 67, the line conductor 13 and is secured by a nut 80 seated in a slot
82 in the housing 3, as shown for instance in FIG. 2.
Although an exemplary support block 81 is shown, that support block may be
replaced by a suitable projection from the rear casing 7. Alternatively, a self-
supporting integral arcing contact and runner may be employed without a
support block. In additional, further support may be provided by the rear casing
7. Although slots 68 are shown in the exemplary runner 65, a wide range of one
or more other openings (e.g., holes) for fasteners may be employed. As another
alternative, the integral arcing contact and runner 65 need not be bolted by the
bolt 79 and nut 80 and, instead, may be suitably welded, brazed, riveted, and/or
fastened by any suitable mechanical fastener.
The arcing contact surface 73 of the integral arcing contact and runner 65 is
parallel to the stationary main contact 19 but extends laterally farther toward the
movable arcing contact or arc toe 59 for a purpose to be discussed. The runner
section 75 forms an obtuse angle a (FIG. 2) with the arcing contact section 71
and leads upward and outward toward one side of an arc chute 83, which is
positioned adjacent the arcing contacts 63. Thus, the sheet metal member 65 is
bent by an angle .beta. (FIG. 2) of less than 90.degree. in forming the arcing
contact section 71 and the runner section 75. Arc chutes such as 83 are known
and include a plurality of arc plates 85 held in spaced relation by a pair of arc
side plates 87 (only one is shown). At the other side of the arc chute 83 is a top
arc plate 89 which extends downward and points toward the movable arcing
contact 59, again for a purpose to be described.
Although an exemplary angle .beta, is shown, the invention is applicable to
larger or smaller angles (e.g., about 0 degrees or less, in which the arc chute is
not as wide as the width of the arc chute 83 and fewer arc plates 85 are
employed).
The contact fingers 25 are biased clockwise (with respect to FIGS. 1-3) by pairs
of helical compression springs 91 seated in recesses 93 in the carrier body 31.
Operation of the operating mechanism 57, pole shaft 55, moving conductor
assembly 23 and contact carrier 29 in order to open and close the contacts 17,63
is described in U.S. Pat. No. 5,969,314, which is incorporated by reference
herein.
If current is being carried by the circuit breaker 1, such as when the circuit
breaker trips open in response to an overcurrent or short circuit, the
electromagnetic forces produced by the current sustained in the arc push the arc
outward toward the arc chute 83 in order that the end of the arc at the
stationary arcing contact 61 moves up the arcing contact section 71 of the
integral arcing contact
and runner 65 onto the runner section 75. At the same time, the rapid opening
of the contact carrier 29 brings the arc toes 59 adjacent the free end of the arc
top plate 89 as shown in FIG. 3 so that the arc extends from the arc toe 59 to
that arc top plate, and moves up such arc top plate into the arc plates 85 which
breaks the arc up into shorter sections. As is known, this stretching of the arc
and breaking it up into smaller sections increases the arc voltage. The increase in
arc voltage, together with the cooling of the arc by ablation of the arc plates 85,
promotes interruption of the arc.
The contact carrier 29 has a feature (recess 107 of FIG. 1), which concentrates
the arc near the center of the stationary arcing contact 61, and, therefore, helps
to direct the arc toward the longitudinal elongated raised ridge 97 of FIG. 4 In
turn, the elongated raised ridge 97 directs the arc upward toward the arc chute
83. The ridge 97 is preferably positioned directly above the location of arc
formation and concentrates electrical charge. The ridge 97 holds the arc in the
center of the integral arcing contact and runner 65 by providing the shortest
path for the arc. The ridge 97 also provides a smooth elevated path that the arc
follows up the height of the integral arcing contact and runner 65 into the center
of arc chute 83.
The preferred design smoothes any corners on the outside profile of the integral
arcing contact and runner 65 and rounds-off the leading comer of the outside
edges, such as shown at 99 of FIG. 4, in order to avoid any feature that is
attractive to the arc.
The elongated raised ridge 97 in the center of the integral arcing contact and
runner 65 is preferably provided by forming the material upward (i.e., toward the
left of FIGS. 1-3 and 5) with a "semi-pierce" in the tooling that stamps the arc
runner part. Also, the rounded leading comer of arc runner edges 99 are
preferably provided by increasing the typical "die-roll" in the tool or by forming
the material backward with a form tool.
As best shown in FIG. 5, the elongated raised ridge 97 includes a raised portion
100 above the runner surface 77 and a tapered portion 101, which descends to a
position proximate an arcuate surface 102 between the stationary contact
surface 73 and the runner surface 77.
FIGS. 6-8 are views similar to FIG. 5, but of respective arc runners 65', 65" and
65'" in accordance with alternative embodiments of the invention. As shown in
FIG. 6, the raised ridge 97' includes a raised portion 100' above a runner surface
77' and a tapered portion 101' which descends to the stationary contact surface
73. Preferably, the tapered portion 101' is flush with the stationary contact
surface 73.
As shown in FIG. 7, the elongated raised ridge 97'" includes a raised portion 100"
above the runner surface 77" and a proud portion 101", which protrudes above
the surface 102" and above the stationary contact surface 73.
As shown in FIG. 8, the raised ridge 97"' includes a raised portion 100'" above
the runner surface 77"' and a tapered portion 101'", which descends to a position
on the runner surface 77'", which position is offset from the stationary contact
surface 73.
Preferably, the stationary arcing contact 61 and the runner section 75 are
integral thereby eliminating the joint between these two elements. This provides
a single smooth surface from the point of arc creation to the top of the integral
arcing contact and runner 65. The result is an increase in the speed of
movement of the arc up the integral arcing contact and runner 65 and into the
arc chute 83, even at low current levels. Also, there is no top edge on the arcing
contact 61, which might lead the arc to one side of the arc chute 83.
The exemplary integral arcing contact and runner 65 also has an arcuate section
98 between the arcing contact section 71 and the runner section 75 which
provides the arcuate surface 102 without any sharp lateral edges which could,
otherwise, divert the arc to the sides or cause hesitation in movement of the arc
toward the arc chute 83.
As can be seen from FIG. 2, the tail ends 103 of the contact fingers 25 are
biased by the springs 91 against a stop ledge 105 on the carrier body 31. The
center of this stop ledge 105 has a recess 107 (see FIG. 1) which allows the
center contact fingers 25 to rotate farther clockwise than the outer contact
fingers (see FIG. 3) when the contact carrier 29 is not in the closed position.
Therefore, the arcing contacts 59 on the center contact fingers 25 are the first to
contact during closing.
More importantly, they are the last to separate on opening so that the arc is
struck primarily between the arcing contacts at the center.
The exemplary integral arcing contact and runner 65 and the elongated raised
ridge 97 improve arc interruption performance of the circuit breaker 1 at higher
voltage ratings than were possible with circuit breakers with prior known arc
runners. The exemplary elongated raised ridge 97 provides a smooth elevated
path that the arc follows up the height of the integral arcing contact and runner
65 into the center of the arc chute 83. This elongated raised ridge attracts and
centers the arc, rather than the outside edges of the arc runner. Otherwise, the
arc might hesitate before entering the arc chute.
While specific embodiments of the invention have been described in detail, it will
be appreciated by those skilled in the art that various modifications and
alternatives to those details could be developed in light of the overall teachings
of the disclosure. Accordingly, the particular arrangements disclosed are meant
to be illustrative only and not limiting as to the scope of invention which is to be
given the full breath of the claims appended and any and all equivalents thereof.
WE CLAIM
1. An electrical switching apparatus (3) comprising:
a load terminal (15) and a line terminal (13);
at least one pair of separable contacts (17, 63) electrically connected
between said load terminal (15) and said line terminal (13);
an operating assembly (66) adapted for movement between an open
position and a closed position to open and close said separable contacts
(17, 63);
an arc chute (83) positioned adjacent said separable contacts (17,63);
and
an arc runner (75) electrically connected to one of said separable contacts
(17,63) and extending toward said arc chute (83) to provide a path for an
arc struck between said separable contacts (17,63) as said separable
contacts open with movement of said operating assembly (66) from the
closed position, said arc runner (75) having a longitudinal elongated
raised ridge (97', 97") generally laterally centered;
wherein said separable contacts (17,63) comprise a stationary contact
(61) and a moving contact (59);
wherein said stationary contact (611) and said arc runner (75) comprise
an electrically conductive member (65) having a base surface (69) in
contact with said line terminal (13), a stationary contact surface (73)
forming said stationary contact (61), and a runner surface (77', 77")
leading towards said arc chute (83);
wherein said raised ridge (97', 97") comprises a raised portion (100,1000
above said runner surface (77', 77") and a tapered portion (101,1010
which descends to a position proximate a surface (102) between; said
stationary contact surface (73) and said ranger surface (77); and
wherein said tapered portion (101, 1010 is above said stationary contact
surface (73).
2. An electrical switching apparatus as claimed in claim 1, wherein said
raised ridge (970 comprises a raised portion (1000 above said runner
surface (770 and a tapered portion (1010 which descends to said
stationary contact surface (73).
3. The electrical switching apparatus as claimed in claim 2 wherein said
tapered portion (101) is flush with said stationary contact surface (73).
4. An electrical switching apparatus as claimed in claim 1, wherein said
raised ridge (97") comprises a raised portion (100") above said runner
surface (77") and a proud portion (101"), which protrudes above a surface
(73) between said stationary contact surface (77") and said runner
surface and above said statioary contact surface (73).

5. The electrical switching apparatus as claimed in claim 1 wherein said
stationary contact (61) is integral with said arc runner (75), thereby
eliminating a joint therebetween.
6. An electrical switching apparatus comprising:
a load conductor (15) and a line conductor (13);
a pair of main contacts (17) having a movable main contact (21) and a
stationary main contact (19), and a separable pair of arcing contacts (63),
comprising a movable arcing contact (59) and a stationary arcing contact
(61), said stationary main contact (19) and said stationary arcing contact
(63) being in electrical contact with said line conductor (13);
an operating assembly (66) electrically connecting said movable main
contact (21) and said movable arcing contact (59) to said line conductor
(13), said operating assembly (66) adapted for movement between an
open position and a closed position to open and close said separable pairs
of contacts (63), and also adapted for transitioning from closure of both
said pair of main contacts and said separable pair of arcing contacts (17,
63), to closure of only said separable pair of arcing contacts (63) while
said pair of main contacts are (17) opened, to opening of said separable
pair of arcing contacts (63) in said open position thereof;
an arc chute (83) positioned adjacent said operating assembly (66); and
an arc runner (75) electrically connected to said stationary arcing contact
(61) and extending toward said arc chute (83) to provide a path for an arc
struck between said separable pair of arcing contacts (63) as said
separable pair of arcing contacts open with movement of said operating
assembly (66) from the closed position, said arc runner (75) having a
longitudinal elongated raised ridge (97) generally laterally centered;
wherein said stationary arcing contact (61) and said arc runner (75)
comprise an electrically conductive member (65) having a base surface
(69) in contact with said line conductor (13), a stationary contact surface
(73) forming said stationary arcing contact (61), and a runner surface (77)
leading toward said arc chute (83); and wherein said raised ridge (97)
comprises a raised portion (100) above said runner surface (77) and a
tapered portion (101) which descends to a position proximate a surface
(102) between said stationary contact surface (73) and said runner
surface (77), with said tapered portion (101) being above said stationary
contact surface (73).
7. The electrical switching apparatus as claimed in claim 6 wherein said
operating assembly (66) comprises at least one contact finger (25)
pivotally mounted on a contact carrier (29) and having said movable
arcing contact (59) adjacent a free end and said movable main contact
(21) spaced from said free end, and comprises contact spring means (91)
pivotally biasing said at least one contact finger (25).
8. An electrical switching apparatus as claimed in claim 7, wherein said
stationary arcing contact (61) and said arc runner (75) comprise an
electrically conductive member (65) having a base surface (69) in contact
with said line conductor (13), a stationary contact surface (73) forming
said stationary arcing contact (61), and a runner surface (770 leading
toward said arc chute (83); and wherein said raised ridge (970 comprises
a raised portion (1000 above said runner surface (770 and a tapered
portion (1010 which descends to said stationary contact surface (73), with
said tapered portion (1010 being lush with said stationary contact surface
(73).
9. An electrical switching apparatus comprising:
housing (3);
a load conductor (15) and a line conductor (13) mounted in said housing
(3);
a pair of main contacts (17) having a movable main contact (21) and a
stationary main contact (19), and a separable pair of arcing contacts (63),
comprising a movable arcing contact (59) and a stationary arcing contact
(61), said stationary main contact (19) and said stationary arcing contact
(61) being in electrical contact with said line conductor (13);
a moving conductor assembly (23) electrically connecting said movable
main contact (21) and said movable arcing contact (59) to said line

conductor (13) and comprising a contact carrier (29) mounted for
movement between an open position and a closed position to open and
close said separable pairs of contacts (17, 63), at least one contact finger
(25) pivotally mounted on said contact carrier (29) and having said
movable arcing contact (59) adjacent a free end and said movable main
contact (21) spaced from said free end, and contact spring means (91)
pivotally biasing said at least one contact finger (25) to move from closure
of only said pair of main contacts (17) with said carrier (29) in said closed
position, to closure of both said pair of main contacts (17) and said
separable pair of arcing contacts (63), to closure of only said separable
pair of arcing contacts (63) while said pair of main contacts (17) are
opened, to opening of said separable pair of arcing contacts (63) as said
carrier (29) moves to said open position;
an arc chute (83) positioned adjacent said moving conductor assembly
(23); and
an arc runner (75) electrically connected to. said stationary arcing contact
(61) and extending toward said arc chute (83) to provide a path for an arc
struck between said separable pair of arcing contacts (63) as said
separable pair of arcing contacts open with movement of said moving
conductor assembly (23) from the closed position, said arc runner (75)
having a longitudinal elongated raised ridge (97) generally laterally
centered;
wherein said raised ridge a raised portion above said arc runner and a
proud portion, which protrudes above a surface between said stationary
arcing contact and said arc runner and above said stationary arcing
contact.
10.The electrical switching apparatus as claimed in claim 9 wherein said
stationary arcing contact (61) and said arc runner (75) comprise an
electrically conductive member (65) having a base surface (69) in contact
with said line conductor (13), a stationary arcing contact surface (73)
forming said stationary arcing contact (61), and a runner surface (77)
leading toward said arc chute (83).
11.The electrical switching apparatus as claimed in claim 10 wherein said
arcing contact surface (73) of said electrically conductive member (65) is
substantially transverse to said base surface (69) and at an obtuse angle
to said runner surface (77).
12.The electrical switching apparatus as claimed in claim 10 wherein said
electrically conductive member (65) is a sheet metal member having a
base section (67) with said base surface (69), a stationary arcing contact
section (71) with said stationary arcing contact surface (73), and a runner
section (75) with said runner surface (77).
13.The electrical switching apparatus as claimed in claim 12 wherein said
arcing contact surface (73) of said electrically conductive member (65) is
substantially transverse to said base surface (69) and at an obtuse angle v
to said runner surface (77).

14.The electrical switching apparatus as claimed in claim 13, comprising a
support member (81) between said arcing contact section (71) and said
housing (3), and fastener means (79) extending through said support
member (81), said base section (67), and said line conductor (13) and
secured to said housing (3).
15.The electrical switching apparatus as claimed in claim 12 wherein said
sheet metal member (65) comprises an arcuate section (98) with an
arcuate surface (102) between said arcing contact section (71) and said
runner section (75).
16.The electrical switching apparatus as claimed in claim 15 wherein said
movable arcing contact (59) comprises an arc toe on said at least one
contact finger (25).

An electrical switching apparatus comprises a load terminal (15) and a line
terminal (13); a pair of main contacts (17); a separable pair of arcing contacts
(63) ; and a moving conductor assembly (23) having a contact carrier (29)
mounted for movement between an open position and a closed position to open
and close the separable pairs of contacts (17,63). The apparatus further
comprises an arc chute (83) and an arc runner (45) electrically connected to a
stationary arcing contact (61) and extending toward the arc chute (83) to
provide a path for an arc struck between the separable pair of arcing contacts
(17,63) as the separable pair of arcing contacts open with movement of the
moving conductor assembly (23) from the closed position. The arc runner (75)
has a longitudinal elongated raised ridge (97) generally laterally centered.

Documents:

1418-kolnp -2003-granted-abstract.pdf

1418-kolnp -2003-granted-claims.pdf

1418-kolnp -2003-granted-correspondence.pdf

1418-kolnp -2003-granted-description (complete).pdf

1418-kolnp -2003-granted-drawings.pdf

1418-kolnp -2003-granted-examination report.pdf

1418-kolnp -2003-granted-form 1.pdf

1418-kolnp -2003-granted-form 18.pdf

1418-kolnp -2003-granted-form 2.pdf

1418-kolnp -2003-granted-form 3.pdf

1418-kolnp -2003-granted-form 5.pdf

1418-kolnp -2003-granted-gpa.pdf

1418-kolnp -2003-granted-reply to examination report.pdf

1418-kolnp -2003-granted-specification.pdf

1418-kolnp-2003-abstract.pdf

1418-kolnp-2003-claims.pdf

1418-kolnp-2003-correspondence.pdf

1418-kolnp-2003-description (complete).pdf

1418-kolnp-2003-drawings.pdf

1418-kolnp-2003-examination report.pdf

1418-kolnp-2003-form 1.pdf

1418-kolnp-2003-form 18.pdf

1418-kolnp-2003-form 2.pdf

1418-kolnp-2003-form 3.pdf

1418-kolnp-2003-form 5.pdf

1418-kolnp-2003-gpa.pdf

1418-kolnp-2003-reply to examination report.pdf

1418-kolnp-2003-specification.pdf


Patent Number 236134
Indian Patent Application Number 1418/KOLNP/2003
PG Journal Number 40/2009
Publication Date 02-Oct-2009
Grant Date 30-Sep-2009
Date of Filing 04-Nov-2003
Name of Patentee EATON CORPORATION
Applicant Address EATON CENTER 1111, SUPERIOR AVENUE, CLEVELAND, OH
Inventors:
# Inventor's Name Inventor's Address
1 RAKUS, PAUL, R 114 CHESTNUT RIDGE DR. BEAVER FALLS, PA 15010
2 GIBSON, PERRY, R. 109 BRADEN SCHOOL RD. BEAVER FALLS, PA 15010
PCT International Classification Number H01H 9/46
PCT International Application Number PCT/IB2002/01626
PCT International Filing date 2002-05-13
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 09/858,027 2001-05-15 U.S.A.