ACCESSORY AND RECESS IDENTIFICATION SYSTEM FOR CIRCUIT BREAKERS

ACCESSORY AND RECESS IDENTIFCATION SYSTEM FOR CIRCUIT BREAKERS

BACKGROUND OF THE INVENTION

The present invention relates to circuit breakers and accessories, and more particularly relates to an identification system for circuit breakers and accessories.

Although essential functions of circuit breakers and their accessories are somewhat standard, the outward appearance and the internal functioning of circuit breakers and various accessories can differ in assorted brands and by various makers and manufacturers. Many accessories can be nearly identical in outward appearance except for a pin pattern in the back of the accessory which is used as a rejection scheme for properly fitting the accessory within a recess sharing the same pin pattern.

While a skilled professional electrician should eventually be able to differentiate accessories and their location for placement within a circuit breaker frame, initial confusion can be frustrating. For a less skilled electrician, this confusion can lead to the inability to properly place the accessories within the circuit breaker frame.

To solve the above-described problem, an electrician or end-user could try the accessory in each compartment of the circuit breaker frame until a mating compartment is found. Of course, this is tedious and could result in damage to either the accessory or compartment if the accessory is inadvertently forced into the wrong compartment. Alternatively, one could ask for help from a fellow electrician, find a manual to identify the solution, or contact the manufacturer for information. In either case, time is being spent unproductively.

SUMMARY OF THE INVENTION

In an exemplary embodiment of the invention, a circuit breaker is • disclosed comprising a molded frame, a circuit breaker accessory, a recess within the molded frame for accepting the circuit breaker accessory, a recess symbol adjacent the recess, and an accessory symbol positioned on the first accessory, the accessory symbol matching the recess symbol for identifying accessory placement within the molded frame.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 shows a top perspective view of a circuit breaker having recesses for accommodating circuit breaker accessories and recess symbols adjacent the recesses;

Fig. 2 shows a plan view of circuit breaker accessory symbol labels;

Fig. 3 shows a plan view of circuit breaker accessory name labels;

Fig. 4 shows a side perspective view of a circuit breaker accessory;

Fig. 5 shows a side perspective view of another circuit breaker accessory; and,

Fig. 6 shows the circuit breaker of Fig. 1 housing the circuit breaker accessory of Fig. 4.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

As shown in Fig. 1, a circuit breaker 10 includes a molded frame 12 having a top surface 14 and a plurality of recesses, shown generally at 24, recessed from the top surface 14, and a base portion 46. The molded frame 12 is preferably made of plastic, or other suitable insulating material. Each recess 24 is adapted to accommodate a specific type of circuit breaker accessory. Recess 16 may accommodate either an under voltage release mechanism ("UNR") or a shunt trip ("SHT" or "ST"). A UNR is adapted to trip the breaker if the voltage drops more than 35%, and should not trip over 85% or more. The maximum reaction time for the UNR is 250 msec. An SHT trips the breaker if there is a fault in the line, with a reaction time of 15 msec from impulse to trip. Recess 18 may accommodate a bell alarm mechanism ("BAM") and recess 22 may accommodate a bell alarm trip ("BAT"). The BAM trips due to mechanical actuation of an operating mechanism and the BAT indicates when the circuit breaker trips because a fault has occurred. Recess 20 may accommodate an auxiliary switch ("AS"). An AS can be either normally open ("NO") or normally closed ("NC"). Upon a breaker trip event, the AS either closes (if normally open) or opens (if normally closed), allowing the AS to be used for any number of applications. An additional accessory that may be employed in a circuit breaker is an actuator ("ACT") which receives a signal from the electronic trip unit - if the trip unit detects an overcurrent condition, then the ACT trips the breaker by actuating a circuit breaker operating mechanism.

The identification system of the present, invention may be utilized on different types of circuit breakers. Employing the identification system of the present invention into other circuit breakers not shown but having recesses for circuit breaker accessories are also within the scope of this invention.

Further shown in Fig. 1 are recess symbols, shown generally at 26, which are preferably molded into the molded frame 12. As shown, the symbols 26 may protrude from the top surface 14. Alternatively, the recess symbols 26 may be indented within the top surface 14. The protruding or indented nature of the recess symbols 26 is preferably accomplished by providing a mold having the shape of the recess symbols 26 therein such that the recess symbols 26 are molded directly into the molded frame 12 during the molding process. Thus, the symbols 26 are preferably tactile such that they cannot easily be worn off. For existing circuit breakers which are to be retrofitted with the identification system of the present invention, symbols 26 may be printed on the top surface 14 or applied to the top surface 14 through the use of adhesive labels.

The recess symbols 26 preferably each have an easily identifiable periphery that can be identified by both sight and touch. Some circuit breakers, such as circuit breaker 10, have very limited space upon top surface 14 to provide identifying indicia and therefore easy to identify shapes are preferred. The recess symbols 26 may be less than 5 mm wide and therefore peripheries which are easily distinguishable by sight and touch are preferred. Within the peripheries of the recess symbols 26 may be a single alphanumeric character or other identifying character such as an arrow to further identify the specific recess symbol 26.

Adjacent the recess 16 is a recess symbol 30 which, as shown, is a rectangle, and, more particularly may be a square. The periphery of a square is thus used to identify the recess 16 as a recess for either an under voltage release or a shunt trip. Adjacent the recess 18 is a recess symbol 32 which, as shown, may have a bell- shaped periphery with the letter "M" therein. The bell-shaped periphery with an interior M is thus used to identify the recess 18 as a recess for accommodating a bell alarm mechanism. Adjacent the recess 20 are recess symbols 34 and 36 which, as shown, each have a circular periphery. Within the circular periphery of each recess symbol 34 and 36 is an arrow. Recess symbol 34 has an arrow pointing to the left and recess symbol 36 has an arrow pointing to the right. Thus, the circular periphery with an interior arrow is used to identify the recess 20 as able to accommodate either type of auxiliary switch. Adjacent the recess 22 is a recess symbol 38 which, as shown, may have a bell-shaped periphery with the letter "T" therein. The bell-shaped periphery with an interior T is thus used to identify the recess 22 as a recess for accommodating a bell alarm trip.

Although the above described recess symbols 26 enable the identification of recesses 24, it is further preferable to provide accessory symbols upon the circuit breaker accessories which match up the particular circuit breaker accessories with the recesses in which the accessories may be accommodated. Turning now to Fig. 2, symbol labels shown generally at 50 may be provided for attachment to respective circuit breaker accessories. Preferably, symbol labels 50 include an adhesive backing such that symbol labels 50 may be adhered to their respective circuit breaker accessories like a "sticker." Alternatively, the symbol labels 50 may have a gummed backing which becomes adhesive upon moistening, or the labels 50 may be taped or glued on in other conventional fashions. In any case, circuit breaker accessories may be retrofitted with the symbol labels 50. In yet another embodiment, the accessory symbols, shown generally at 52, may be directly molded or embossed into the surface of their respective circuit breaker accessories, although this would require an initial investment in mold changes for all circuit breaker accessories. If possible, the accessory symbols 52 could also be printed onto the surfaces of the circuit breaker accessories.

Referring again to Fig. 2, each accessory symbol 52 is shown provided (e.g. imprinted) on a suitably sized sheet 54. Preferably, the accessory symbols 52 match the recess symbols 26 for easily matching the circuit breaker accessories within the recesses 24. That is, the accessory symbols 52 may be identical, at least in appearance, to the recess symbols 26, although they may be larger or smaller than the recess symbols 26. The actual size of symbols 52 would be dictated by the allotted space upon the surfaces of the circuit breaker accessories. Preferably, the symbol labels 50 are placed upon a front surface of their respective accessories such that both accessory symbols 52 and recess symbols 26 are visible when insertion of a circuit breaker accessory is made into a recess 24, thus providing confirmation that the particular circuit breaker accessory has been installed within the proper recess or compartment 24.

Fig. 2 further shows accessory symbols 60 and 62 each having a circular periphery 64. The difference between accessory symbols 60 and 62 lies in the interior characters placed within the circular peripheries 64. That is, accessory symbol 60 is provided with a left directional arrow 68 and accessory symbol 62 is provided with a right directional arrow 66. Similarly, accessory symbols 76 and 78 are each provided with a bell-shaped periphery 70, however accessory symbol 76 has the character "T" 72 within the bell-shaped periphery 70 and accessory symbol 78 has the character "M" 74 within the bell-shaped periphery 70. Accessory symbols 80 and 84 may share the square shaped periphery 82, while accessory symbol 86 is provided with a triangular periphery 88.

Thus, accessory symbol 60 matches recess symbol 34, accessory symbol 62 matches recess symbol 36, accessory symbol 76 matches recess symbol 38, accessory symbol 78 matches recess symbol 32, accessory symbol 80 matches recess symbol 30, and accessory symbol 84 matches recess symbol 30. Although not shown, accessory symbol 86 preferably matches a recess symbol 26 provided upon a circuit breaker having a recess 24 for an actuator. Turning now to Fig. 3, a plurality of name labels 90 are shown. These name labels 90 may be advantageously placed upon a side surface on a circuit breaker accessory to clearly identify the circuit breaker accessory. The name labels 90 may include sheets or other flat substrates 54 with adhesive qualities as previously described with respect to symbol labels 50. Alternatively, the information contained within each name label 90 may be provided upon the circuit breaker accessories in other manners as described above with respect to symbol labels 50. Upon each sheet 54, an acronym or abbreviation 92 of the name of the circuit breaker accessory is provided. Preferably, the acronym 92 includes a first acronym 94 of the circuit breaker accessory's name in a first language (e.g. English) and a second acronym 96 of the circuit breaker accessory's name in a second language (e.g. French). The first and second acronyms 94, 96 may be separated by a backslash, hyphen, space, or other suitable dividing character to clearly distinguish them apart from one another. If space permits, the circuit breaker's name 98 may also be provided on the name label 90.

As shown in Fig. 3, name label 100 is provided with the acronyms "AS/CA" and name "Auxiliary Switch", name label 102 is provided with the acronyms "BAT/SD" and the name "Bell Alarm Trip", name label 104 is provided with the acronyms "BAM/SDE" and the name "Bell Alarm Mechanism", name label 106 is provided with the acronyms "UNR/MN" and the name "Under Voltage

Release", name label 108 is provided with the acronyms "SHT/MX" and the name "Shunt Trip", and name label 110 is provided with the acronyms "ACT/???" and the name "Actuator" (where ??? may be the French or other foreign language equivalent abbreviation for actuator).

Figs. 4 and 5 demonstrate exemplary circuit breaker accessories and their use of symbol labels 50 and name labels 90. The accessory 120 shown in Fig. 4 may be either an under voltage release, shunt trip, or an actuator because these accessories can share a similar exterior appearance. The difference between an under voltage release and a shunt trip may be internal only, and the difference between these two accessories and an actuator may be only an external rejection pin scheme. While the similarities between the accessories improve the manufacturing process of circuit breaker accessories, these accessories are so similar in appearance that confusion can easily occur. Thus, symbol label 50 is preferably provided on a front surface 122 of the accessory 120 and name label 90 is preferably provided on a side surface 124 of the accessory 120 to clearly identify the accessory 120. For example only, the accessory symbol 84 and name label 108 are shown on the surfaces 122 and

124, respectively. Surface 126 on accessory 120 could also carry accessory symbol 84 as that is also a front surface of the accessory 120. By "front surface", it is meant the surface which remains visible after insertion of accessory within the recess 24.

Turning now to Fig. 5, accessory 130 may be an auxiliary switch and is thus provided with one of the accessory symbols 60, 62 on front surface 132. The accessory symbol 60 having the left directional arrow is shown, for exemplary purposes. Name label 100 is placed on side surface 134 to identify the accessory 130 as an auxiliary switch.

The identification system of the present invention is shown in use in Fig. 6, where an under voltage release or shunt trip 120 is shown correctly inserted within recess 16. To affirm correct positioning prior to placement, accessory symbol 84 may be compared to recess symbol 30. Since they "match", correct positioning of accessory 120 in recess 16 is confirmed. Whether an under voltage release or shunt trip is to be used may be confirmed by review of the name label 90 prior to insertion within the recess 16.

Thus, an identification system has been described which incorporates easy to understand symbols in the design of the circuit breaker frame and accessories to help customers properly install internal accessories. The symbols are meant to provide the customer with an easy way of matching the accessory to the proper compartment on the circuit breaker.

Of course, the above-described recess and accessory symbols 26, 52 are exemplary only and may be altered using different peripheries and/or characters as is deemed appropriate. Similarly, the acronyms and names displayed on name labels 90 may be changed to adequately describe the attached accessory in the appropriate language and with the amount of detail required by the end user.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.