Patent Application
20140374226
The subject matter disclosed herein relates to the art of circuit breakers and, more particularly, to a conductor guide member for a circuit breaker terminal assembly.
Circuit breakers, such as those employed in various industrial applications, include multiple sections that may be field repaired and/or replaced. For example, many circuit breakers include a main body, an upper terminal assembly, and a lower terminal assembly. The upper terminal assembly generally includes contacts connected to upper terminals. The upper terminals are generally connected to an electrical load. The lower terminal assembly generally includes electrical contacts connected to lower terminals that are generally connected to an electrical source. The terminal assembly also typically includes a moving arm that shifts moveable contacts into and out of engagement with the electrical contacts in the upper terminal assembly. The moveable contacts are typically connected to the lower terminals through foils or conductors.
Disassembly of the lower terminal assembly for repair often times requires disconnecting the conductors from the lower terminals. Field removal of the conductors is very difficult at best. Reconnecting the conductors with the lower terminals in the field is even more difficult if not impossible. Aligning connection points on the conductors and the lower terminals in the field is difficult if not impossible at times. Accordingly, field repair of the terminal assembly is often times a frustrating and time consuming operation. Thus, in most cases, repair of the terminal assembly requires the complete removal of the circuit breaker. Complete removal of the circuit breaker increases the time involved with implementing a repair procedure.
According to one aspect of an exemplary embodiment, a conductor guide member for a circuit breaker terminal assembly includes a body having at least one conductor guide surface configured and disposed to facilitate alignment between at least one terminal connection member of the terminal assembly and at least one conductor. The at least one conductor guide surface gradually slopes from a first end to a second end. The second end defines a recess.
According to another aspect of an exemplary embodiment, a terminal assembly for a circuit breaker includes a bracket element, and a terminal fixedly connected to the bracket element. The terminal includes at least one connection member. A moveable terminal is supported by the bracket element. At least one conductor includes a first end portion electrically coupled to the moveable terminal and a second end portion having a connection element electrically coupled to the terminal A conductor guide member is connected to the bracket element. The conductor guide member includes a body having at least one conductor guide surface configured and disposed to facilitate alignment between the at least one connection member of the terminal and the second connection element of the at least one conductor. The at least one conductor guide surface gradually slopes from a first end to a second end. The second end defines a recess.
According to yet another aspect of an exemplary embodiment, a method of connecting a conductor to a circuit breaker terminal assembly includes passing an end of the conductor along at least one conductor guide surface, positioning a connection element provided on the end of the conductor adjacent a connection member provided on a terminal of the circuit breaker, and aligning the connection element with the connection member.
These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
A circuit breaker in accordance with an exemplary embodiment is indicated generally at 2 in
Bracket element 14 also supports a moving arm assembly 45. Moving arm assembly 45 includes a first plate 50 spaced from a second plate 52. An actuator or lever 55 is pivotally mounted between first and second plates 50 and 52. First and second plates 50 and 52 each have an opening such as shown at 57 on first plate 50 that receives a pin 58. Pin 58 pivotally links first and second plates 50 and 52 to bracket element 14. First and second plates 50 and 52 also support a moveable contact assembly 60 including a contact support member 70. Contact support member 70 includes a first mounting element 74 and a second mounting element 75. First and second mounting elements 74 and 75 take the form of threaded fasteners such as indicated at 76 in
First and second mounting elements 74 and 75 join a first conductor 77 and a second conductor 78 to contact support member 70. First and second conductors 77 and 78 may take the form of flexible conductor foils or braided flexible conductors (not separately labeled). First conductor 77 includes a first end portion 81 that extends to a second end portion 82. Similarly, second conductor 78 includes a first end portion 84 that extends to a second end portion 85. First end portions 81 and 84 of first and second conductors 77 and 78 are joined to contact support member 70 through first and second mounting elements 74 and 75. Each second end portion 82 and 85 include corresponding terminal mounting elements 87 and 88 which, as will be detailed more fully below, are employed in joining first and second conductors 77 and 78 to fixed terminal 30. First and second mounting elements 74 and 75 also connect a first terminal element 94 and a second terminal element 95 to contact support member 70. First and second terminal elements 94 and 95 are employed to electrically connect first and second conductors 77 and 78 to a moveable terminal 100 as will be detailed more fully below. Mounting hardware, indicated generally at 104, supports moveable terminal 100 to mounting pads 105 provided on contact support member 70. Mounting hardware 104 includes terminal connectors, such as shown at 106, that facilitate an electrical link between conductors 77 and 78 and moveable terminal 100. More specifically, terminal connectors 106 are linked to first and second terminal mounting elements 94 and 95 through conductors (not shown).
Occasionally, there is a need to remove moveable contact assembly 60 for repair. Removing moveable contact assembly 60 requires disconnecting second end portions 82 and 85 of first and second conductors 77 and 78 from fixed terminal 30. Disconnecting first and second conductors 77 and 78 is a relatively easy operation. However, with conventional circuit breakers, re-establishing the connection can prove to be difficult or at the very least frustrating. Aligning the first and second connection elements 87 and 88 with first and second connection members 35 and 36 requires a great deal of time and more than a little bit of luck. As such, reconnecting moveable contact assembly 60 in prior art circuit breakers would generally involve removal and disassembly of terminal assembly 10 from housing 4. In accordance with an exemplary embodiment, luck and/or the removal of terminal assembly 10 to re-establish a connection between first and second conductors 77 and 78 and fixed terminal 30 is no longer necessary.
In accordance with an exemplary embodiment, terminal assembly 10 includes a conductor guide member 120. As shown in
At this point, reference will be made to conductor guide surface 141 with an understanding that conductor guide surfaces 140, 142, and 143 include similar geometry. Conductor guide surface 141 includes at least one conductor guide surface 146 that extends from an outer edge (not separately labeled) of first end section 129 along a generally arcuate path to second end section 130 forming a recess 150. In accordance with one aspect of the exemplary embodiment, at least one conductor guide surface 146 includes a substantially smooth curvilinear guiding surface 147 that is configured to guide a conductor end into a desired position. In accordance with an aspect of the exemplary embodiment, curvilinear guiding surface 147 is formed as a series of angular surfaces. Recess 150 is sized so as to generally correspond to a thickness of the conductors as shown in
At this point it should be understood that the exemplary embodiment or embodiments describe a conductor guide member that facilitates alignment between conductors or foils and a terminal in a circuit breaker. The conductor guide member includes one or more guide surfaces that position an end portion of a conductor adjacent to a terminal. The conductor guide surface also facilitates alignment of a connection element or opening formed in the conductor with a connection member or opening formed in the terminal. The conductor guide surface also includes structure that retains a fastener element such as a nut. Further, while shown as including four conductor guide surfaces that guide two conductors into a desired position, the number of guide surfaces and conductors may vary. In addition, while the circuit breaker is shown with two contacts, the number of contacts could vary. Also, while described as being part of a lower terminal assembly, the exemplary embodiments can be incorporated into various other types of terminal assemblies. For example, the conductor guide surface(s) could be materially integrally formed with the housing.
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
