Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
  • H01B5/002—Auxiliary arrangements
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/08—Terminals; Connections
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/12—Automatic release mechanisms with or without manual release
  • H01H71/14—Electrothermal mechanisms
  • H01H71/16—Electrothermal mechanisms with bimetal element

Definitions

• the disclosed concept relates generally to electrical switching apparatus and, more particularly, to electrical switching apparatus, such as circuit breakers.
• the disclosed concept also relates to conductor assemblies for circuit breakers.
• Electrical switching apparatus such as circuit breakers, provide protection for electrical systems from electrical fault conditions such as, for example, current overloads, short circuits, abnormal voltage and other fault conditions.
• circuit breakers typically include an operating mechanism, which opens electrical contact assemblies to interrupt the flow of current through the conductors of an electrical system in response to such fault conditions.
• the electrical contact assemblies include stationary electrical contacts and corresponding movable electrical contacts that are typically mounted on movable (e.g., pivotable) arms.
• the stationary and movable contacts are in physical and electrical contact with one another when it is desired that the circuit breaker provide electrical current therethrough to a load.
• the movable contact arm is pivoted, thereby moving the movable contact away from the stationary contact creating a space therebetween.
• the movable contact arms and other current carrying components, such as conductor assemblies are typically made from copper. Thus, as the cost of copper increases, the cost of these components increases.
• a conductor assembly for an electrical switching apparatus.
• the electrical switching apparatus includes a housing having an interior and an exterior.
• the conductor assembly comprises: a first conductor member; a second conductor member; and a plurality of fasteners mechanically fastening and electrically connecting the first conductor member to the second conductor member.
• the first conductor member is made from a first material and the second conductor member is made from a second different material.
• the first conductor member and the second conductor member may combine to form a bimetallic conductor assembly.
• the first material of the first conductor member may be copper, and the second material of the second conductor member may be aluminum.
• the first conductor member may be structured to extend from the exterior of the housing into the interior of the housing, and the fasteners are structured to fasten the second conductor member to the first conductor member within the interior of the housing.
• the first conductor member may include a terminal portion and a mounting portion, and the second conductor member comprises a first end and a second end disposed opposite from the first end, wherein the fasteners fasten the first end of the second conductor member to the mounting portion of the first conductor member.
• the second conductor member may further comprise a bend between the first end of the second conductor member and the second end of the second conductor member, in order that the second end is disposed at an angle with respect to the first end.
• an electrical switching apparatus employing the aforementioned conductor assembly, is disclosed.
• Figure 1 is a side elevation view of a circuit breaker and conductor assembly therefor, in accordance with an embodiment of the disclosed concept, showing the circuit breaker in the ON position;
• Figure 2 is an isometric view of the circuit breaker and conductor assembly of Figure 1, showing the circuit breaker in the OFF position;
• Figure 3 is a side elevation view of the circuit breaker and conductor assembly of Figure 2, showing the circuit breaker in the TRIPPED position;
• Figure 4A is an exploded isometric view of a movable contact arm assembly, shown in Figure 3;
• Figure 4B is an assembled side elevation view of the movable contact arm assembly of Figure 4A;
• Figure 5A is an exploded isometric view of the conductor assembly
• Figures 5B and 5C are assembled front and back isometric views of the conductor assembly of Figure 5 A.
• fastener refers to any suitable connecting or tightening mechanism expressly including, but not limited to rivets, screws, bolts and the combinations of bolts and nuts (e.g., without limitation, lock nuts) and bolts, washers and nuts.
• Coupled together shall mean that the parts are joined together either directly or joined through one or more intermediate parts. As employed herein, the statement that two or more parts are
• attachment shall mean that the parts are directly joined together, without any intermediate parts.
• number shall mean one or an integer greater than one (i.e., a plurality).
• FIG. 1 shows a movable contact assembly 100 for an electrical switching apparatus, such as for example and without limitation, a circuit breaker 2, in accordance with one non-limiting embodiment of the disclosed concept.
• the circuit breaker 2 includes a housing 4, separable contacts 6,8 enclosed by housing 4, and an operating mechanism, such as for example and without limitation an operating handle 10, for opening and closing the separable contacts 6,8.
• the separable contacts 6,8 include a stationary contact 6 and a movable contact 8 (partially shown in hidden line drawing in Figure 1), and are shown in electrical contact with one another, corresponding to the circuit breaker 2 being disposed in the ON position.
• Figure 2 shows the operating handle 10, separable contacts 6,8, and other circuit breaker components in their respective positions corresponding to the circuit breaker 2 being disposed in the OFF position, such that the movable contact 8 (shown in hidden line drawing in Figure 2) is separated, and electrically disconnected, from the stationary contact 6, as shown.
• Figure 3 shows the circuit breaker 2 and corresponding components (e.g., without limitation, separable contacts 6,8; operating mechanism 10; movable contact arm assembly 100) in their respective positions corresponding to the circuit breaker 2 being disposed in the TRIPPED position.
• the example movable contact arm assembly 100 includes a first member 102 and a separate second member 104, which is attached to the first member 102, as will be described in greater detail hereinbelow.
• the first member 102 is made from a first material and the second member 104 is made from a second, different material.
• the first member 102 and the second member 104 combined to form a bimetallic movable contact arm 100.
• bimetallic refers to an assembly of a plurality (e.g., at least two) of metal parts attached or otherwise suitably joined together (see, for example and without limitation, bimetallic movable contact arm 100, best shown in Figure 4B).
• the first material of the first member 102 is steel
• the second material of the second member 104 is copper. In this manner, the amount of copper required for the movable contact arm assembly 100 is reduced.
• the aforementioned movable contact 8 (shown in hidden line drawing in Figures 2 and 3) is disposed on the second member 104.
• the first and second members 102, 104 each include first ends 106,110 and second ends 108,1 12, respectively.
• the first end 106 of first member 102 cooperates with the operating mechanism 10 (e.g., without limitation, opening handle).
• the first end 1 10 of the second member 104 is attached to the second end 108 of the first member 102.
• the movable contact 8 is disposed on the second end 112 of the second member 104, as shown. It will be appreciated, however, that the movable contact 8 could alternatively comprise an integral portion or segment of the second member 104. In other words, it is not a requirement of the disclosed concept for the separable contact 8 to be a separate part that is attached to the second member 104. It is anticipated that it could alternatively comprise an integral portion or segment of the second member 104.
• the second end 108 of the first member 102 has a first shape
• the first end 1 10 of the second member 104 has a second shape.
• the first shape of the first member 1 10 compliments the second shape of the second member 104, as shown.
• the second end 108 of the first member 102 includes a recess 114
• the first end 1 10 of the second member 104 includes a protrusion 116.
• the protrusion 116 is disposed within the recess 1 14 to complete the movable contact arm assembly 100.
• the second end 108 of the example first member 102 preferably includes first and second opposing legs 1 18,120, wherein the recess 114 is formed between such legs 1 18, 120, as best shown in Figure 4A.
• the protrusion 1 16 is disposed within the recess 1 14 between the first and second legs 1 18,120 to complete the assembly 100, as shown in Figure 4B.
• the first and second legs 1 18,120 which are made, for example and without limitation from steel, are compressed inwardly against the protrusion 116, which is made, for example and without limitation from copper, in order to further secure the copper second member 104 to the steel first member 102.
• the example circuit breaker 2 further includes a bimetal structure 12 and a flexible shunt 14.
• the flexible shunt 14 preferably extends between and electrically connects the second member 104 of the movable contact arm assembly 100 to the bimetal structure 12, as shown. It will, how r ever, be appreciated that any known or suitable alternative type and/or configuration of electrical connection (not shown) could be employed, without departing from the scope of the disclosed concept.
• the example circuit breaker 2 includes a conductor assembly 200 ( Figures 1-3, 5A, 5B and 5C), which also functions to advantageously further reduce the amount of copper required to be used in the circuit breaker 2.
• the disclosed conductor assembly 200 includes a first conductor member 202, a second conductor member 204, and a plurality of fasteners 206,208 for mechanically fastening and electrically connecting the first conductor member 202 to the second conductor 204.
• the first conductor member 202 is made from a first material, such as for example and without limitation, copper
• the second conductor member 204 is made from a second, different material, such as for example and without limitation, aluminum. Accordingly, the first and second conductor members 202,204 combine to form a bimetallic conductor assembly 200, which substantially reduces the amount of copper required.
• the first conductor member 202 is structured to extend from the exterior 22 of the circuit breaker housing 4 into the interior 20.
• the fasteners which in the example shown and described herein are rivets 206, fasten (e.g., rivet) the second conductor member 204 to the first conductor member 202 within the interior 20 of the housing 4.
• the first conductor member 202 includes a terminal portion 210, which is accessible from the exterior 22 of the circuit breaker housing 4, and a mounting portion 212.
• the example mounting portion 212 is an upturned flange (best shown in Figures 5 A and 5C), wherein the second conductor member 204 includes opposing first and second ends 214,216, and a first pair 206 of the aforementioned rivets 206,208 fastens the first end 214 of the second conductor member 204 to the upturned flange 212 of the first conductor member 202, within the interior 20 of the circuit breaker housing 4, as shown.
• the second conductor member 204 further includes first and second opposing sides 222,224, wherein the second side 224 of the first end 214 of the second conductor member 204 is riveted to the upturned flange 212 using the first pair of rivets 206, as best shown in Figures 5A-5C. It will, however, be appreciated that any known or suitable alternative number, type and/or configuration of fastener could be employed, without departing from the scope of the disclosed concept.
• the second conductor member 204 preferably further includes a bend 218 disposed between the first and second ends 214,216. Accordingly, as shown in Figure 5B, the second end 216 of the second member 204 is disposed at an angle 220 with respect to the first end 214 of the second conductor member 204. As shown in Figures 1-3, this configuration of the second end 216 being disposed at an angle 220 ( Figure 5B) with respect to the first end 214, functions to position the second end 216 of the second conductor member 204 of the conductor assembly 200 in the desired orientation with respect to other internal electrically conductive components, such as for example and without limitation, the bimetallic structure 12.
• the second end 216 of the second conductor member 204 is electrically connected to the bimetal structure 12 by a flexible shunt 16, as shown.
• the example second conductor member 204 includes a second pair of rivets 208 disposed at or about the second end 216 of the second conductor member 204.
• the flexible shunt 16 is mechanically fastened and electrically connected to the second end 216 of the second conductor member 204 by a corresponding one of the rivets 208. It will, however, be appreciated that any known or suitable alternative configuration and/or mechanism for electrically connecting the conductor assembly 200 to other circuit breaker components (e.g., without limitation, bimetal structure 12) could be employed, without departing from the scope of the disclosed concept.
• the aforementioned conductor assembly 200 could be employed independently within any known or suitable electrical switching apparatus (e.g., without limitation, circuit breaker 2 of Figures 1- 3) with, or without, the aforementioned movable contact arm assembly 100 ( Figures 1-4C).

Landscapes

• Switch Cases, Indication, And Locking (AREA)
• Thermally Actuated Switches (AREA)
• Breakers (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=49510577

Family Applications (1)

Country Status (3)

Citations (6)

• 2013
  • 2013-10-21 CA CA2887121A patent/CA2887121C/en active Active
  • 2013-10-21 WO PCT/US2013/065910 patent/WO2014088713A1/en active Application Filing
  • 2013-10-21 MX MX2015007120A patent/MX352847B/es active IP Right Grant

Patent Citations (6)

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