JP3246562B2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker such as a circuit breaker for a wiring or an earth leakage breaker.

[0002]

2. Description of the Related Art In general, a circuit breaker for wiring has a structure in which an opening / closing mechanism and an overcurrent trip device are integrally incorporated in a container comprising a case and a cover made of a molded resin. In addition, in the earth leakage breaker which also has the function of the circuit breaker for wiring,
A ground fault detecting device and its trip device are further incorporated in the container.

[0003]

Conventionally, in such a circuit breaker or an earth leakage breaker, the mold resin containers have been made in different sizes from each other. It is thought that the leakage breaker is naturally larger than the wiring breaker because the leakage detector is added to the leakage breaker in addition to the components of the circuit breaker. Because it was. However, conventional circuit breakers with different container sizes for the circuit breaker for wiring and the earth leakage breaker cannot flexibly cope with changes in the specifications between the two, and the molding of the container becomes separate. Mold cost was also high. SUMMARY OF THE INVENTION It is an object of the present invention to provide a circuit breaker which can unify containers of a circuit breaker and an earth leakage breaker, and can obtain various advantages.

[0004]

To achieve the object above-mentioned problems SUMMARY OF THE INVENTION This invention, Ri Do from the case and the cover of the mold resin, each phase in these cases and coverings partition
In a container interphase walls that are formed respectively in the opening and closing mechanism and the overcurrent tripping device is a circuit breaker which is integrally incorporated, the preliminary space with overcurrent tripping in the container separating the device and the load terminal Formed across each phase,
Remove the interphase walls that intersect with each other, and replace
Instead, a shield plate is detachably attached .

[0005]

[Function] When a spare space is formed in a container and this container is used as a circuit breaker, simply pass the conductor connecting the overcurrent trip device and the load side terminal to the storage space and use it as a ground fault circuit breaker. In such a case, a ground fault detector is installed in the spare space from which the shielding plate has been removed . Thereby, the container can be unified with the circuit breaker for wiring and the earth leakage breaker. Also, when used as a circuit breaker for wiring, this spare space can be used as a utility space to accommodate various additional functional components.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 is a longitudinal sectional view of a circuit breaker for wiring, and FIG. 2 is a plan view thereof. In these figures, an opening / closing mechanism 3 is provided in a container comprising a case 1 and a cover 2 made of a molded resin.
And an overcurrent tripping device 4 are integrally incorporated.
The electric current is supplied from the power supply side terminal 5 to the fixed contact 6 integrated therewith,
The movable contact 7 comes and comes in contact with the fixed conductor 8, the fixed conductor 8 comes into sliding contact with the contact, the heater conductor 9 of the overcurrent tripping device 4 connected to the fixed conductor 8, and the connection conductor 10 brazed to this. It flows to the load side terminal 11 integrated with this.

[0007] When the current flowing through the heater conductor 9 of the overcurrent tripping device 4 becomes overloaded, the bimetal 12 by the heat generated by the heater conductor 9 is curved to the left in FIG. 1, the adjustment screw portion 12a of the tip The trip portion 3a of the opening / closing mechanism 3 is pushed to unlock the opening / closing mechanism 3 and the movable contact 7 is released. Also, when a large current such as a short-circuit current flows through the heater conductor 9, the armature 13 of the overcurrent tripping device 4 is instantaneously sucked in the counterclockwise direction in FIG. 1, and the tip portion 13a strikes the tripping portion 3a. The movable contact 7 is separated.

Here, between the overcurrent trip device 4 and the load side terminal 11 in the container, a spare space 14 separating them is provided.
Are formed across the phases. The portion 10a of the connection conductor 10 formed of the rectangular conductor bent to the same shape in each phase and crossing the spare space 14 is formed on the back surface (mounting surface) of the case 1.
And are formed in parallel. In the case 1 and the cover 2, which partition the interior of the container for each phase, portions intersecting with the spare space 14 are removed from the phase spacing walls 1 a and 2 a, and instead, a rectangular shielding plate 15 is inserted using a groove (not shown). It is detachably mounted.

FIGS. 1 and 2 show a configuration as a circuit breaker for wiring. FIGS. 3 and 4 show a configuration in which an earth leakage breaker is formed by using the same case 1 and cover 2. FIG. Here, FIG. 3 is a longitudinal sectional view, and FIG. 4 is a perspective view of the ground fault detecting device. In FIG. 3, in addition to the components of the circuit breaker of FIG. 2, a spare space 14 from which the shielding plate 15 has been removed is shown.
A ground fault detecting device 16 is installed therein.

As shown in FIG. 4, a ground fault detecting device 16 includes a zero-phase current transformer (ZCT) 17 having a connecting conductor 10 connecting the overcurrent tripping device 4 and the load terminal 11 as a primary conductor,
The connecting conductor 10 is bent toward the center phase (S phase) so that the right and left phases (R, T phases) penetrate the ZCT 17. The illustrated shape is used. Although the structure is not described, the leakage trip unit 1 that is activated by the output of the electronic circuit unit 18 is provided beside the opening and closing mechanism 3.
9 are installed.

The function and operation of the earth leakage breaker shown in FIG. 3 as a wiring breaker are the same as those in FIG. 1, but a ground fault occurs and the current of each phase passing through the connecting conductor 10 is unbalanced. Occurs, the ZCT 17 detects this, and a trip signal is output from the electronic circuit unit 18, and the earth leakage trip unit 19 acts on the trip portion 3a of the opening / closing mechanism 3 to separate the movable contact 7.

FIGS. 5 and 6 show an embodiment in which a terminal temperature display device is provided on the load side of the circuit breaker shown in FIGS. 1 and 2 using the spare space 14. FIG. FIG. 6
Is a plan view thereof. As shown in FIG. 5, a bimetal 20 is joined to a vertical portion of the connection conductor 10 of each phase by a rivet 21, and a scale plate 22 provided with a temperature scale is provided at the tip thereof so as to be close to the ceiling wall of the cover 2. Attached to. On the other hand, a window hole 23 is formed in a portion of the cover 2 facing the scale plate 22, and is closed by a transparent cover 24 on which a pointer 24a is displayed.

In such a configuration, when the fastening portion between the terminal 11 and the external conductor (not shown) generates heat due to poor fastening or the like, the heat causes the bimetal 20 to bend rightward in FIG. Therefore, the scale of the scale plate 22 is changed to the pointer 24a.
Can be checked for each phase to prevent burning of the circuit breaker due to overheating.

FIGS. 7 and 8 show an embodiment in which a spare number display device for counting the number of operations of the overcurrent trip device 4 is provided in the circuit breaker of FIGS. 7 is a longitudinal sectional view, and FIG. 8 is a plan view thereof. In FIG. 7, a double counter 25 is attached to the cover 2 for each phase, and its push buttons 25a and 25
b is pushed in by the adjusting screw 12a of the bimetal 12 and the tip 13a of the armature 13, respectively.

In such a configuration, when an overload current or a short-circuit current occurs, as described above, the bimetal 12 bends, or the armature 13 is attracted, and the movable contact 7 is separated. When the current is cut off and the bimetal 12 or the armature 13 returns to the illustrated state, the push button 25
The adjusting screw portion 12a or the tip portion 13a separated from the a or 25b pushes the push button 25a or 25b again to increase the corresponding counter scale. As a result, the accident history for each overload and short circuit can be clearly grasped, and the management of the degree of contact wear and the like can be easily performed.

As described above, in the illustrated embodiment, the provision of the spare space 14 in the molded container allows the same container to be used for both the circuit breaker and the earth leakage breaker. The addition or deletion of the short detection unit 16 and the leakage trip unit 19 makes it easy to change the specifications between them. Further, the spare space 14 can accommodate various functional components such as a terminal temperature detection device and a trip number display device.

[0016]

According to the present invention, a spare space separating the overcurrent tripping device and the load side terminal in the container traverses each phase.
Forming Te, remove the interphase walls crossing the pre space
At the same time, since the shielding plate is detachably mounted instead, the case of the wiring breaker and the case of the earth leakage breaker can be unified. As a result, it is possible to freely cope with a specification change such as addition or deletion of a leakage detection function to the circuit breaker for wiring, and it is possible to reduce molding costs by reducing the types of covers and cases. Further, by utilizing the spare space as a utility space for accommodating various components, it is easy to add an additional function to the circuit breaker for wiring.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a circuit breaker showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a vertical sectional view of a main part of an earth leakage breaker showing an embodiment of the present invention.

FIG. 4 is a perspective view of the ground fault detecting device in FIG. 3;

FIG. 5 is a longitudinal sectional view of an essential part of an embodiment in which a terminal temperature detecting device is added to the circuit breaker of FIG. 1;

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a longitudinal sectional view of an essential part of an embodiment in which a trip count display device is added to the circuit breaker of FIG. 1;

FIG. 8 is a plan view of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Cover 3 Opening / closing mechanism 4 Overcurrent trip device 10 Connection conductor 14 Spare space 16 Ground fault detecting device 17 ZCT 18 Electronic circuit unit 19 Earth leakage trip unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Tosaka 1-1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Koji Nomura 1st Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture No. 1 Inside Fuji Electric Co., Ltd. (56) References JP-A-4-154022 (JP, A) JP-A-1-160644 (JP, U) JP-A-3-26953 (JP, U) JP-A-62-1 150855 (JP, U) Japanese Utility Model Hei 5-72031 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 73/06 H01H 71/02 H01H 83/02

Claims (1)

(57) [Claims] (1) A mold resin case and cover.
In these cases and covers, the phase spacing separating each phase
In a container wall is formed respectively, in the opening and closing mechanism and the overcurrent tripping device is a circuit breaker which is integrally incorporated, each phase preliminary space with overcurrent tripping in the container separating the device and the load terminal Formed across the intersection with this spare space
The interphase barriers that are
A circuit breaker, wherein a shielding plate is detachably mounted .