JPH0143808Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a molded case circuit breaker, and particularly to a circuit breaker suitable for a case where the body is shaped like an agreement.

[Prior Art] Molded circuit breakers that are housed in distribution boards and used as branch breakers are of the so-called collective type, which is a type of circuit breaker that has been established by the Ministry of Construction in order to standardize the dimensions of specific parts, such as width. It is common to comply with the standard dimensions. That is, as shown in the first figure, the width W of the body A is made to conform to the above-mentioned standard dimensions.

Inside the body A, as shown in the second diagram, for example, there is a fixed contact B, a movable contact C that approaches and separates from the fixed contact B, and a movable contact C that engages with the movable contact C to perform a contact and detachment operation. A link mechanism D, a handle E that engages with the link mechanism D, an overcurrent detection device F, and an extinguisher that extinguishes the arc generated between the contacts B and C (more specifically, between the two contacts) due to the contact/separation operation. The arc device G etc. are accommodated. In addition, body A
The mechanism of the members housed inside the
There are also types such as those shown in Publication No. 50-87455 and Japanese Utility Model Application No. 139256/1983.

[Problem to be solved by the invention] Since the above-mentioned dimensions of the width W etc. are relatively small, when viewed from the front where the handle is located, each member accommodated is arranged in a superposed manner. Therefore, each member is subject to dimensional restrictions. In other words, the coil H of the overcurrent detection device F and the arc extinguishing device G
could not be made very large, and the rated current of the circuit breaker could not be made large (for example, about 50 Amax).

This invention was created in view of the above reasons.
The purpose is to increase the rated current,
Moreover, it is an object of the present invention to provide a molded circuit breaker whose body can be adapted to the agreed size.

[Means for solving the problem] In order to solve the problem, the molded circuit breaker of the present invention has a fixed contact, a movable contact that approaches and separates from the fixed contact, and a movable contact that is connected to the movable contact. A link mechanism that engages the link mechanism to perform a contact/separation operation, a handle that engages with the link mechanism, an overcurrent detection device, and an arc extinguishing device that extinguishes an arc generated during the contact/separation operation. A molded circuit breaker housed in
In addition to doubling the width, a vertical wall is provided approximately in the center of the width, two chambers are installed side by side, and an opening for the handle is provided within the width dimension of the agreed form standard dimensions from the end face of one of the width directions. and a terminal recess, the arc extinguishing device alone is accommodated in the chamber on the side where the handle opening and the terminal recess are not provided, and a pair of arc running units extend oppositely from both ends of the arc extinguishing device. The plate is formed into a U-shape, the tip of which extends to the arc generating part in the adjacent chamber, and an iron core is arranged near the bottom of the U-shape inside the arc running plate.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

1 is a resin body whose overall shape conforms to the dimensions of the agreed-upon shape standard except for the width dimension. The width dimension is twice the standard dimension of the agreement type (2W when the width standard dimension is W). For example, one width W part in the width direction is the left body part 2, and the other side The portion having the width W becomes the right body portion 3. In this embodiment, a terminal recess 5 into which a power supply terminal and load terminals 4, 4 are attached, and a handle 6 protrude from the left body part 2 (within the width dimension of the agreement type standard dimension from the end surface of the body 1). A handle opening 7 is provided for use. In addition, the right body part 3 has a terminal recess 5.
There is no opening 7 for a handle or a handle, and a box is formed by an outer wall 8 having approximately the same outer shape as the left body portion 2. Therefore, the left body part 2 is substantially the same as the body A shown in the conventional example, which is adapted to the agreed standard dimensions. Note that the width direction here refers to the direction in which a molded circuit breaker, which is housed in the distribution board and used as a branch breaker, is installed, and the left body part 2 and right body part 3 are placed in opposite positions. It can be a relationship.

Inside the body 1, a vertical wall 11 is provided approximately in the center of the width 2W, so that two chambers 9 and 10 are arranged side by side. In one chamber 9 on the side corresponding to the right body portion 3, only the arc extinguishing device 12, which is constructed with a sufficient size, is accommodated. Therefore, the other chamber 10 on the side corresponding to the left body part 2 contains a fixed contact, a movable contact that approaches and separates from this fixed contact, and a link that engages with this movable contact to perform a contact and detachment operation. mechanism, a handle 6 engaging this linkage
and an overcurrent detection device. In addition,
The circuit breaker mechanism other than the arc extinguishing device 12 will not be described in detail since it is not the gist of the present invention, but a general circuit breaker mechanism as shown in the second figure may be employed.

The vertical wall 11 described above does not completely separate the two chambers 9, 10, but has a communication section 13 that communicates the two chambers 9, 10 in a part, and a cylindrical section 14 in the vicinity thereof. An iron core 15 is inserted into the cylindrical portion 14.

In the arc extinguishing device 12 housed in one chamber 9, a plurality of deionization grids 18 are disposed facing each other with a predetermined gap between the electrode plates 16 and 17 at both ends. From the electrode plates 16 and 17, a pair of arc traveling plates 21 formed of opposing plates 19 and 20, which face each other with a gap suitable for guiding the arc, extend in a U-shape. That is, the arc travel plate 21 has a U-shaped bottom located in the communication part 13, and a tip thereof located in the other adjacent chamber 10 where the fixed contact 22 and the movable contact 23 are arranged.
This leads to the arc generating section 24. in particular,
One opposing plate 19 is connected to a fixed contact 22, and the other opposing plate 20 is opposed to the fixed contact 22 with a movable contact 23 interposed therebetween. Therefore, the iron core 15 is disposed near the inner U-shaped bottom of the arc traveling plate 21.

In the case of such a molded circuit breaker, both contacts 2
The arc generated in the arc generating section 24 during the contact/separation operations of 2 and 23 is guided by the arc traveling plate 21 and extinguished by the arc extinguishing device 12. In this case, the arc moves straight from the arc generating part 24 and the pressure in the P part in the other chamber 10 becomes high, and if the pressure of the arc going straight increases, it acts so that it does not follow the U-shaped part of the arc traveling plate 21. A reaction force is applied to the arc, but since the iron core 15 is disposed near the inner U-shaped bottom of the arc traveling plate 21,
The arc is given centripetal force and is guided smoothly.

[Effects of the invention] Since the molded case circuit breaker of the present invention is configured as described above, each component including the arc extinguisher can be made larger, so the rated current can also be made larger.
Moreover, the width of the body is 2 in terms of the standard dimensions of the agreement type.
By just doubling the size, it can be used in a consistent state with other equipment in the distribution board, and it can meet the agreed standard dimensions.
In addition, even if the arc traveling plate is long and turns in a U-shape, the arc can be reliably guided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a general molded circuit breaker that conforms to the dimensions of the agreed standard, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is a perspective view showing an embodiment of the present invention.
FIG. 4 is a plan view of the main part thereof, and FIG. 5 is a perspective view of the arc running plate. DESCRIPTION OF SYMBOLS 1... Body, 2... Left body part, 3... Right body part, 5... Recessed part for terminal, 7... Opening for handle, 9, 10... Chamber, 11... Vertical wall, 13...
Communication part, 14...Cylindrical part, 6...Handle, 12
... Arc extinguishing device, 21 ... Arc running plate, 15 ...
Iron core, 22... fixed contact, 23... movable contact, 24... arc generating part.

Claims (1)

[Claims for Utility Model Registration] A fixed contact, a movable contact that approaches and separates from the fixed contact, a link mechanism that engages with the movable contact to perform a contact and detachment operation, and a link mechanism related to this link mechanism. A molded circuit breaker comprising a matching handle, an overcurrent detection device, and an arc extinguishing device for extinguishing an arc generated during the contact/separation operation, and these are housed in a body, the body being The width is 2 of the standard size of the agreement type.
In addition to doubling the width, a vertical wall is provided approximately in the center of the width, two chambers are installed side by side, and an opening for the handle is provided within the width dimension of the agreed form standard dimensions from the end face of one of the width directions. and a terminal recess, the arc extinguishing device alone is accommodated in the chamber on the side where the handle opening and the terminal recess are not provided, and a pair of arc running units extend oppositely from both ends of the arc extinguishing device. A molded circuit breaker in which a plate is formed into a U-shape, the tip of which extends to an arc generating part in an adjacent room, and an iron core is disposed near the bottom of the U-shape inside the arc traveling plate.